An expansion formula for Stark effect transition probabilities is derived in terms of field-free (spherical) transition probabilities. Expansion coefficients are squares of Clebsch-Gordan coefficients from the SO(4) = SU(2) x SU(2) description of the hydrogen atom. The method provides new sum rules for ...
Energy Citations Database
... dynamics, OH, Transition probabilities, Rotational ... PROBABILITY, ACCURACY, ENERGY TRANSFER, TRANSITIONS, GROUND ...
DTIC Science & Technology
... of probability method of calculation, energy levels and probability of transition between them ... calculation of number of optical transitions. ...
The atomic xenon laser is among the most efficient and powerful of the near-infrared gas lasers, especially when pumped by molecular ions in an Ar-Xe mixture. Accurate transition probabilities for the laser transitions are critical in developing a fundamental understanding of the inversion dynamics, gain, and power ...
... OF MEASURING TRANSITION PROBABILITIES. ... Descriptors : (*ELECTRON TRANSITIONS, PROBABILITY ... ATOMIC ENERGY LEVELS, SODIUM ...
We calculate the transition radiation process ???? at an interface of two media. The neutrinos are taken to be with only standard-model couplings. The medium fulfills the dual purpose of inducing an effective neutrino-photon vertex and of modifying the photon dispersion relation. The transition radiation occurs when at least one of those quantities have ...
NASA Astrophysics Data System (ADS)
... Transition moments and their associated transition probabilities, line ... The lower and upper energy levels of the transitions tabulated herein ...
We consider a class of problems, notably double ionization, which require accurate descriptions of correlation in both the initial and final states. Methods are presented for representing correlated wavefunctions on a basis spline lattice, and for calculating bound-continuum transition probabilities. 13 refs.
DOE Information Bridge
Accurate knowledge of x-ray fluorescence yields is an important ingredient in the solution of many practical problems and in the understanding of the decay mechanisms of atomic states characterized by inner-shell vacancies. In the present work, coincidenc...
National Technical Information Service (NTIS)
... The formulas for the transition probabilities and for the transition intensities are ... are presented for the intensity of the forbidden transitions in lithium ...
Accurate energies and transition probabilities for the two 2s-2p transitions of light berylliumlike ions are calculated using a mixed configuration-interaction and perturbation-theory approach. The obtained energies are in close agreement with experiment. The rates of the forbidden transition ...
A comprehensive theory of the Landau-Zener transition in quadratic nonlinear two-state systems is developed. A compact analytic formula involving elementary functions only is derived for the final transition probability. The formula provides a highly accurate approximation for the whole rage of the variation of the ...
Accurate theoretical data for the transition probabilities are highly demanding in astrophysics and in the study of plasma in astrophysical objects and fusion devices. Na-like highly stripped ions of iron group, specially NiXVIII is very important in this respect. A highly improved basis in a relativistic many-body coupled-cluster ...
... indication of how transition probabilities might ... PROBABILITY, HYDROGEN, TRANSITIONS, BACKGROUND RADIATION, MASS ...
... METHODS OF DETERMINING TRANSITION PROBABILITIES AND LEVEL POPULATION DENSITIES BY SELF-ABSORPTION OF RADIATION,. ...
... Title : COLLISIONAL TRANSITION PROBABILITIES FOR VIBRATIONAL DEACTIVATION OF CHEMICALLY ACTIVATED SEC-BUTYL RADICALS. ...
Many physical and chemical processes, such as folding of biopolymers, are best described as dynamics on large combinatorial energy landscapes. A concise approximate description of the dynamics is obtained by partitioning the microstates of the landscape into macrostates. Since most landscapes of interest are not tractable analytically, the probabilities of ...
PubMed
This paper extends our previous work on obtaining reaction coordinates from aimless shooting and likelihood maximization. We introduce a simplified version of aimless shooting and a half-trajectory likelihood score based on the committor probability. Additionally, we analyze and compare the absolute log-likelihood score for perfect and approximate reaction coordinates. We also ...
... Allowed and forbidden transitions are listed separately. For each line the transition probability for ... the statistical weights, and the energy levels of the ...
A semiclassical surface hopping model is presented for the calculation of nonadiabatic transition probabilities for the case in which the avoided crossing point is in the classically forbidden regions. The exact potentials and coupling are replaced with simple functional forms that are fitted to the values, evaluated at the turning point in the classical ...
Aims: We measure transition probabilities for Cr II transitions from the z 4H_J, z 2D_J, y 4F_J, and y 4G_J levels in the energy range 63 000 to 68 000 cm-1. Methods: Radiative lifetimes were measured using time-resolved laser-induced fluorescence from a laser-produced plasma. In addition, branching fractions were determined from ...
This work presents an analytic description of the coherent excitation of a two-state quantum system by an external field with a Gaussian temporal shape and a constant frequency. A very accurate analytic approximation to the transition probability is derived by using the Dykhne-Davis-Pechukas approach. This approximation provides ...
Postexponential decay of the probability density of a quantum particle leaving a trap can be reproduced accurately, except for interference oscillations at the transition to the postexponential regime, by means of an ensemble of classical particles emitted with constant probability per unit time and the same ...
... SIGNIFICANCE OF ENERGY LEVEL TRANSITIONS IN NERVE ... probability of transition of ... Descriptors : *ELECTRON TRANSITIONS, *MOLECULAR ...
Accurate wave functions obtained from model potential methods are used to calculate the probabilities of the magnetic quadrupole transitions 2 /sup 3/P/sub 2/..-->..2 /sup 1/S/sub 0/ of the beryllium isoelectronic sequence and 3 /sup 3/P/sub 2/..-->..3 /sup 1/S/sub 0/ of the magnesium isoelectronic sequence. The results are ...
... Discrete probability maps DMPs are an accurate and effective way of representing the probability of emitters being at certain locations. ...
In this paper, we report on weighted oscillator strengths of E1 transitions and transition probabilities of E2 transitions among different low-lying states of triply ionized germanium using highly correlated relativistic coupled cluster (RCC) method. Due to the abundance of Ge IV in the solar system, planetary ...
A few remarks are first made on invariant probability measures of a transition probability operator. The notion of irreducibility is introduced for a transition operator acting on the continuous functions on a compact space and implications of this assump...
Absolute transition probabilities are given for the bands of the Herzberg I, Chamberlain, Herzberg II and Herzberg III systems of molecular oxygen. Nightglow, Oxygen, Transition probabilities. (mjm)
Jan 1, 1971 ... Title: Atomic transition probabilities of the halogens ... Abstract: Halogens atomic transition probabilities spectroscopic measurements in ...
NASA Website
Theoretical transition probabilities are reported for doubly ionized gold (Au III). They have been obtained through the use of two different independent theoretical approaches, i.e. the SUPERSTRUCTURE code and a HFR model including valence-valence and core-valence configuration interaction in a detailed way. The new scale of A-values is assessed through ...
Problems related to the oscillator strengths in Sr II, Y II, and Zr II are discussed, and new accurate transition probabilities are reported that are derived from measurements of lifetimes and branching ratios of Y II and Zr II lines present in the spectra of chemically peculiar stars of the upper main sequence. These oscillator ...
Transition probabilities of 1191 spectral lines in the first spectra of Nb, Rh, Hf, Ta, and W are determined by accurate measurements of radiative lifetimes and branching ratios. The lifetimes are measured by the time-resolved laser-induced fluorescence on an atomic beam. The atomic beam source is a low pressure, large-bore hollow ...
Atomic transition probabilities for 2874 lines of the first spectrum of cerium (Ce I) are reported. These data are from new branching fraction measurements on Fourier transform spectra normalized with previously reported radiative lifetimes from time-resolved laser-induced-fluorescence measurements (Den Hartog et al 2009 J. Phys. B: At. Mol. Opt. Phys. 42 ...
... For each ion the transitions are arranged ... to multiplets, supermultiplets, transition arrays, and ... Allowed and forbidden transitions are listed separately ...
In many diseases, Markov transition models are useful in describing transitions between discrete disease states. Often the probability of transitioning from one state to another varies widely across subjects. This heterogeneity is driven, in part, by a possibly unknown number of previous disease states and by ...
... Abstract : Transition probabilities were calculated for forbidden transitions within the 2s22p and 2s2p2 configurations and for permitted transitions in ...
Using accurate numerical wave functions within the adiabatic approximation, we calculate transition rates for the hydrogen atom in strong magnetic fields (of order 10/sup 10/--10/sup 12/ gauss, which are assumed for neutron stars), and compare with variational results of Wadehra. An error inherent in his work is pointed out. It is found that using ...
The spectrum of the solar corona, plasma spectra, astrophysical objects and fusion devices exhibit forbidden lines in alkali-like ions. Ions belonging to the iron group are particularly important in this respect. More accurate data for term values, line strengths and transition probabilities are reported for electric quadrupole (E2) ...
Radiative lifetimes, accurate to �5%, have been measured for 153 levels of neutral cerium using time-resolved laser-induced fluorescence (TRLIF) on a slow beam of cerium atoms. Of the 153 levels studied, 150 are even parity and 3 are odd parity. The levels range in energy from 16 869 to 28 557 cm?1. This set of Ce I lifetimes is much more extensive than others published to ...
... Accession Number : ADD095222. Title : Wavelengths and Transition Probabilities for Atoms and Atomic Ions. Part I. Wavelengths. Part II. ...
... probability parameters of the nitric oxide systems were ... Descriptors : *ELECTRON TRANSITIONS), (*NITROGEN OXIDES, (*INFRARED SPECTRA ...
... Accession Number : AD0700979. Title : TRANSITION PROBABILITIES OF ARGON II. Descriptive Note : Final rept. 1967-1969,. ...
... Accession Number : AD0656790. Title : RATIOS OF E2 TRANSITION PROBABILITIES OF DEFORMED EVEN-EVEN NUCLEI,. ...
Fixed point probability vector of ergodic /cyclic/ transition matrices by matrix inversion technique
NASA Technical Reports Server (NTRS)
... Title : ENERGY LEVELS AND TRANSITION PROBABILITIES OF IRON DOPED SAPPHIRE. Descriptive Note : Engineering research rept.,. ...
... Accession Number : AD0664799. Title : E2 TRANSITION PROBABILITIES IN THE DAVYDOV MODEL,. Corporate Author ...
... Title : Atomic Transition Probabilities for Vanadium, Chromium, and Manganese (A Critical Data Compilation of Allowed Lines),. ...
... THESIS AN ANALYSIS OF YOUTH LABOR FORCE TRANSITION PROBABILITIES ... AN ANALYSIS OF YOUTH LABOR FORCE December, 1984 ...
... Title : THEORETICAL DETERMINATION OF THE PROBABILITY OF AN ELECTRIC QUADRUPOLE TRANSITION (K VOPROSU O ...
... PROBABILITIES AND ABSORPTION OSCILLATOR STRENGTHS FOR THE ALKALI-LIKE IONS OF THE ALKALINE EARTHS AND FOR CALCIUM I. ...
Many physical and chemical processes, such as folding of biopolymers, are best described as dynamics on large combinatorial energy landscapes. A concise approximate description of dynamics is obtained by partitioning the micro-states of the landscape into macro-states. Since most landscapes of interest are not tractable analytically, the probabilities of ...
E-print Network
A Chebyshev-based flux-flux correlation function approach is introduced for calculating multiple initial state selected reaction probabilities for bimolecular reactions. Based on the quantum transition-state theory, this approach propagates, with the exact Chebyshev propagator, transition-state wave packets towards the reactant ...
The determination of the elements of the S matrix within the framework of time-dependent density-functional theory (TDDFT) has remained a widely open question. We explore two different methods to calculate state-to-state transition probabilities. The first method closely follows the extraction of the S matrix from the time-dependent Hartree-Fock ...
Rotational lines of AlCl were discovered in 1987 by Cernicharo et al. in IRC +10216. Since that time, experimentalists have confirmed the A1? - X1?+ and a3? - X1?+ electronic transitions of AlCl. We have shown with high level ab initio calculations that the excited A1? and a3? states exhibit recoupled pair bonding, where the 3s2 pair of electrons on Al is decoupled and then ...
The form factor for the transition between the hydrogenic states with parabolic quantum numbers n{sub 1}n{sub 2}m and n{sub 1}{sup {prime}}n{sub 2}{sup {prime}}m{sup {prime}} is obtained in a closed analytic form. The asymptotic limit of the transition form factor at large parabolic quantum numbers is derived, and a comparison with exact quantum ...
Atomic structure calculations were performed for properties such as energy levels, binding energies, transition probabilities, lifetimes, hyperfine structure, and isotope shifts. Accurate computational procedures were devised so that properties could be predicted even when they could not be obtained from experiment, and to assist in ...
Energy levels, with classifications and uncertainties, have been compiled for the spectra of the neutral atom and all positive ions of sodium (Z=11). Wavelengths with classifications, intensities, and transition probabilities are also tabulated. In addition, ground states and ionization energies are listed. Where available, the hyperfine structure ...
We treat the interaction of an atom with a short intense few-cycle laser pulse by the use of the Magnus expansion of the time-evolution operator. Terms of the Magnus expansion up to the third order in the pulse duration are evaluated explicitly, and expressions for the transition probability between atomic eigenstates are given. The ...
... moments and transition probabilities ... ENERGY, ELECTROMAGNETIC RADIATION, STRENGTH ... GENERAL), PHOTONS, TRANSITIONS, KINETICS ...
Generalized oscillator strengths have been computed for high-energy electron scattering by H/sub 2/. The optically allowed transitions from the electronic ground state (X /sup 1/..sigma../sup +//sub g/) to the B /sup 1/..sigma../sup +//sub u/ state and the optically forbidden transitions to the E /sup 1/..sigma../sup +//sub g/ state have been considered. ...
... order transitions. Our method gives accurate results for the two dimensional Ising model. (Author). Descriptors : *Transitions ...
Songs of many songbird species consist of variable sequences of a finite number of syllables. A common approach for characterizing the syntax of these complex syllable sequences is to use transition probabilities between the syllables. This is equivalent to the Markov model, in which each syllable is associated with one state, and the ...
PubMed Central
Radiative lifetimes measured by time-resolved laser-induced fluorescence are reported for 40 odd-parity levels and 36 even-parity levels of singly ionized terbium. The odd-parity levels range in energy from 29000 to 40000 cm{minus}1 and those of even-parity from 21000 to 37000 cm{minus}1. These lifetimes, with one exception, are accurate to {+-}5%. They will provide an ...
The technique of time-resolved laser-induced fluorescence is the best method for lifetime measurements because it is largely free from systematic errors that undermine other methods. Lifetime measurements have been performed using time-resolved laser-induced fluorescence on atom and ion beams of many refractory elements including MoI, WI, ZrI, HfI, TaI, RhI, ReI, RuI, NbII, CoII and NiII. The ...
We present a procedure for the determination of the interaction potential from the knowledge of the radial pair distribution function. The method, realized inside an inverse Monte Carlo simulation scheme, is based on the application of the maximum entropy principle of information theory and the interaction potential emerges as the asymptotic expression of the transition ...
Octupole vibrntions of deformed even-mass nuclei are considered in terms of the collective model. The second quantization method is applied. It is shown that g-vibrations are accurately separnted from gamma vibrations for any frequency. The reduced probability for M2 transition from the g-band is calculated. (auth)
We present an analytical description of neutrino oscillations in matter based on the Magnus expansion of the time evolution operator. This approach incorporates in a simple and, at the same time, accurate way the Earth matter effects on the flavor transition probabilities in a wide interval of the neutrino energies. As a concrete ...
Astrophysical implications of a new scale of accurate oscillator strengths obtained for Eu II are discussed. A new value of the solar photospheric abundance of Europium is derived: A(Eu) equals 0.51 plus or minus 0.08, in the usual logarithmic scale. Some stellar implications of the new gf-values are also presented.
Current status of advanced theoretical methods for transition probabilities for atoms and ions is discussed. An experiment on the f values of the resonance transitions of the Kr and Xe isoelectronic sequences is suggested as a test for the theoretical methods.
... Transition probabilities for both v ... NITROGEN, *ELECTRON TRANSITIONS, IONS, CHEMICAL ... TIME, MOLECULAR ENERGY LEVELS, POTENTIAL ...
New absolute atomic transition probability measurements are reported for 12 transitions in Cr II and
Aims: We attempt to derive accurate transition probabilities for astrophysically interesting spectral lines of ion{Nb}{ii} and ion{Nb}{iii} and determine the niobium abundance in the Sun and metal-poor stars rich in neutron-capture elements. Methods: We used the time-resolved laser-induced fluorescence technique to measure radiative ...
The technique of photoelectron spectroscopy was used to obtain the relative continuum transition probabilities of atomic oxygen at 584 A for transitions from 3P ground state into the 4S, D2, and P2 states of the ion. Transition probability ratios for the ...
The energies of the three gamma lines in Hg/sup 199/ were measured absolutely, using an iron-free double-focusing spectrometer. The atomic binding energy was also absolutely determined. Relative L-subshell conversion intensities were found to yield accurate information on the multipolarity. Relative M-shell conversion coefficients were compared with theory. ...
The photon and electron spectra of 158*Gd as result of the (n, gamma)-reaction on 157Gd were calculated with IMRDEC Monte Carlo computer program. The relaxation probabilities were taken from EADL file of the Lawrence Livermore National Laboratory. Because this file does not consist of data for some N and O transitions, they were additionally determined by ...
Accurate lifetime measurements have been carried out on the first levels in the nuclei 102Ru, 106,108pd, and first 5/2 and 9/2 in 103Rh, 107,109Ag, by the recoil-distance method. Deduced ratios between reduced E2 transition probabilities B(E2) in the same or neighbouring nuclei have been compared to the predictions of collective ...
Local approach has been used to compute a) Jinitiation and JR curves at different temperatures and b) fracture toughness transition curves at different probability of failure. The material under investigation is the Reactor Pressure Vessel Steel 22NiMoCr37. Ductile fracture has been analyzed using Gurson material constitutive model and ...
The authors list vacuum wavelengths, energy levels, statistical weights, transition probabilities, and oscillator strengths for permitted resonance spectral lines of all ions of 18 astrophysically important elements (H through Si, S, Ar, Ca, Fe). Using a compilation of experimental energy levels, the authors derived accurate ...
Exchange in the hydrogen atom--molecule reaction is investigated via classical collinear dynamics on the Yates--Lester potential energy surface. A threshold kinetic energy of 6.4762 kcal/mole (0.2808 eV) is determined. Exchange probabilities are found to be, in general, slightly less than those obtained using the energy surface of Shavitt, Stevens, Minn, and Karplus. Energy ...
The activity of a (109)Cd solution has been accurately determined without using (109)Cd nuclear decay data such as emission probabilities. An ampoule containing this calibrated (109)Cd solution was sent to the Bureau International des Poids et Mesures to include the activity result in the database of the International Reference System (SIR). The emission ...
The mass transit industry will be affected by the transition to the metric system and must plan for it. The potential effects of metric conversion on the transit industry are discussed based on an assessment of the most probable course of action to be fol...
Calculations are performed for the probabilities of singlet and triplet transitions of a helium atom in a strong constant electric field. The probability of the forbidden transitions is found to depend strongly on the intensity of the electric field. The calculated values are compared with the experimental data.
Statistical theory of interior-exterior transition and collision probabilities for minor bodies to exhibit a complicated array of behaviors such as transition between the interior and exterior Hill). Using the structures around libration points, a statistical theory of the probability of interior
The usual dipole approximation for the transition probabilities for hydrogen atoms is derived from the exact transition probabilities by considering j = 1 photons only, neglecting retardation, and using an identity derived from the wave equation for the r...
... Probabilities. Volume II. Sodium through Calcium,. Corporate Author : NATIONAL STANDARD REFERENCE DATA SYSTEM. ...
We present a methodology for determining reservoir groundwater age and transit time probability distributions in a deterministic manner, considering advective-dispersive transport in steady velocity fields. In a first step, we propose to model the statistical distribution of groundwater age at aquifer scale by means of the classical advection-dispersion ...
We present a methodology for determining reservoir groundwater age and transit time probability distributions in a deterministic manner, considering advective dispersive transport in steady velocity fields. In a first step, we propose to model the statistical distribution of groundwater age at aquifer scale by means of the classical advection dispersion ...
The work presents transition probabilities with very low uncertainties for a selected set of multiplets of Mn I and Mn II. Multiplets are chosen which are accessible to ground-based observation, are relatively unblended and unsaturated in stellar spectra and which are amenable to accurate branching fraction determination. These lab ...
Malay (Rumi) is alphabetic and has a transparent, agglutinative system of affixation. We manipulated language-specific junctural phonetics in Malay and English to investigate whether morphophonemic L1-knowledge influences L2-processing. A morpheme decision task, "Does this "nonword" sound like a mono- or bi-morphemic English word?", was developed by crossing English ...
ERIC Educational Resources Information Center
... AD0464661. Title : SCF EXCITED STATES AND TRANSITION PROBABILITIES OF SOME NEON-LIKE AND ARGON-LIKE IONS. ...
Ratios of E2 transition probabilities for the deexcitation of levels belonging to the ground state-, beta-, and gamma-rotational bands in the deformed region 150
The transition probability is calculated for excitation of double-exciton states in absorption and emission processes in molecular crystals. It is found that: (1) A major contribution to the transition probability for cooperative excitation to electronic ...
... Personal Author(s) : Miller, BJ ; Fuhr, JR ; Martin, GA. ... on Atomic Transition Probabilities (1914 through October 1977), and it covers the literature on ...
... Accession Number : ADD095043. Title : Atomic Transition Probabilities for Scandium and Titanium (A Critical Data Compilation of Allowed Lines),. ...
... Accession Number : ADD095186. Title : Atomic Transition Probabilities for Iron, Cobalt, and Nickel (A Critical Data Compilation of Allowed Lines),. ...
... Title : Atomic Transition Probabilities for Forbidden Lines of the Iron Group Elements. (A Critical Data Compilation for Selected Lines),. ...
... areas researched by Joint Forces Staff College ... ie, Army, Navy, Air Force) service publications ... Analysis of Youth Labor Force Transition Probabilities. ...
Three Monte Carlo methods for computing transition dipole moments are presented. Two of these approaches are based on the use of multiple Monte Carlo random walks'' to sample different probability distributions. The remaining technique employs a single Monte Carlo walk and averages an analytic approximation to the Green's ...
The development of fusion reactors has generated a demand for improved knowledge of the atomic properties of tungsten. Using a multi-configuration Dirac�Fock (MCDF) method with a restricted active space treatment, the wavelengths and transition probabilities of the M1 and E2 transitions in the visible light region are calculated for ...
... molecule and the probablity of a transition occurring because of a single collision can be calculated from experimentally determined transition rates ...
... moments and transition probabilities were ... SPECTROSCOPY, THERMAL RADIATION, RADIATION EFFECTS ... ELECTRON TRANSITIONS, BAND ...
... These transition amplitudes probably represent a lower limit on the amplitude of transition from linear to nonlinear behavior for the primary elastic ...
... Title : Entrance Time Distribution and Limiting Transition Probabilities for Continuous-Time Markov Chains, with Applications to Stochastic Combat ...
... of the collisional transition probabilities. ... ENERGY TRANSFER, *ENERGY LEVELS, MATHEMATICAL ... ELECTRON TRANSITIONS, COLLISIONS ...
This paper addresses the issue of counting the occurrence of special events in the framework of partiallyobserved discrete-event dynamical systems (DEDS). Developed diagnosers referred to as sequential window diagnosers (SWDs) utilize the stochastic diagnoser probability transition matrices developed in [9] along with a resetting mechanism that allows ...
Progress in three research areas has been achieved. (1) A new expression for the trapping probability for transitioning particles in asymmetric toroidal plasma confinement devices (e.g., stellarators and rippled tokamaks) has been derived. Comparison with numerical integrations shows that this new expression is more accurate than those ...
Recently available experimental data are combined to obtai accurate values of the reduced magnetic dipole transition probabilities between rotational states of deformed odd-mass nuclei. These results are interpreted on the basis of the rotational model to yield the gyromagnetic factors g/sub R/ and g/sub K/. It appears that ...
An enhanced model, based on the extended boson approximation, for the lowest-lying states in odd-mass nuclei is presented. Our approach is built on the quasiparticle phonon model, extending it to take into account the ground-state correlations due to the action of the Pauli principle more accurately than in the conventional theory. The derived interaction strengths between the ...
