Accurate minority carrier recombination rate measurements by new capacitance transient method of Ti,

Quite early in the mid-70s, it had become apparent that data on recombination of multiply charged ions was urgently needed for accurate modelling of fusion plasmas and coincidentally to test theories of dielectronic recombination which were beginning to d...

or emission resulting from the formation of atomic deuterium, i.e. photo-recombination. Accurate measurement) is a weak function of both and Te. For photo- recombination into the atomic ground state, n=1, the emission. The temperatures are determined from spectroscopic measurements which ...

We compare the measured and calculated light output of a semiconductor laser modulated by a saturable intracavity absorber. An accurate description of the dynamic and static behavior requires inclusion of both a carrier concentration dependent recombination rate and a voltage-dependent saturable absorption.

The flowing-afterglow technique in conjunction with computer modeling of the flowing plasma has been used to determine accurate dissociative-recombination rate coefficients alpha for the ions O2(+), HCO(+), CH5(+), C2H5(+), H3O(+), CO2(+), HCO2(+), HN2O(+...

Reliably interpreting spectra from both photoionized and electron-ionized cosmic plasmas requires an accurate understanding of the ionization balance of the source and the underlying atomic physics which produces the ionization structure. Uncertainties in ionization balance calculations hamper our ability to model cosmic sources and to infer reliably their properties. Of ...

A method for the determination of the surface recombination velocity of cylindric vias for the application in back-contacted silicon solar cells is proposed. By applying a theoretical framework for the lifetime dependence on dislocation density, the measured minority carrier lifetime as a function of via density can be described ...

... MEASUREMENTS OF RECOMBINATION PARAMETERS OF SILICON STRUCTURES AND HIGH-EFFICIENCY SOLAR CELLS BY THE ...

Capacitance Voltage measurements crucially depends on many parameters such as measurement voltage, electrolyte of the diffused emitter. The procedure to extract Sn0 is as follows. The J0e values are obtained from QSSP recombination velocity parameter is the only free parameter in the model; other model parameters for Auger

The interest in the recombination rate for the HCO ion stems ... recombination, we have undertaken measurements of the recombination ...

The recombination signals (RS) that guide V(D)J recombination are phylogenetically conserved but retain a surprising degree of sequence variability, especially in the nonamer and spacer. To characterize RS variability, we computed the position-wise information, a measure correlated with sequence conservation, for each nucleotide ...

Photoluminescence excitation measurements are shown to accurately determine the spectral response of Ga(1-x)Al(x)As-GaAs heterojunction solar cells. The technique is applicable to as-grown structures prior to processing into final devices and can also be used to study postgrowth techniques designed to enhance the spectral response of such devices. The ...

After remarkable reduction in the Z1/2 center in n-type 4H-SiC epilayers, the measured carrier lifetimes can be severely affected by other recombination paths. Impacts of carrier recombination at the surface as well as in the substrate are investigated in detail by using numerical simulation based on a diffusion equation. The ...

In order to explain O I lines in the tropical nightglow, complete and reasonably accurate recombination and emission rate coefficients are used to construct a detailed radiative cascade model of a recombining oxygen plasma. Effective recombination coeffic...

... AD0244448. Title : A PROCEDURE FOR THE ACCURATE MEASUREMENT OF INFRARED DICHROISM OF ORIENTED FILMS. ...

... Title : A METHOD OF ACCURATELY MEASURING DYNAMIC STABILITY DERRIVATIVES IN TRANSONIC AND SUPERSONIC WIND TUNNELS,. ...

Recombination between homologous chromosomes of different parental origin (homologs) is necessary for their accurate segregation during meiosis. It has been suggested that meiotic inter-homolog recombination is promoted by a barrier to inter-sister-chromatid recombination, imposed by meiosis-specific components of ...

Most codes of practice for dosimetry of proton beams do not give a clear recommendation on the determination of recombination correction factors for ionization chambers. In this work, recombination corrections were measured in the low-energy clinical proton beam of the Clatterbridge Centre of Oncology (CCO) using data collected at ...

We present a state-of-the-art primordial recombination code, HYREC, including all the physical effects that have been shown to significantly affect recombination. The computation of helium recombination includes simple analytic treatments of hydrogen continuum opacity in the He I 21Po-11S line, the He I] 23Po-11S line, and treats ...

A perplexing anomaly arises in the determination of abundances of common elements in gaseous nebulae, as derived from collisionally excited lines (CEL) as opposed to those from Recombination Lines (RCL). The "abundance discrepancy factors" can range from a factor of 2 to an order of magnitude or more. That has led to quite different interpretation of the physical structure and ...

Charge pumping measurements of the spectral distribution of interface states are performed on three SOS device structures. In contrast to bulk devices with similar channel geometries, there is significant bulk recombination in addition to the normally present interface state recombination. The bulk recombination ...

A low reaction rate with nitric oxide (NO) is one of the important characteristics of hemoglobin (Hb)-based oxygen carriers. The reaction rate between oxyHb and NO is usually measured by stopped-flow spectrophotometry. However, the reported rates vary due to the difficulty of accurately determining the NO concentration and the limit of the instrument dead ...

... Title : AN ACCURATE LABORATORY TEST SYSTEM USING COMMERCIAL EQUIPMENT FOR EDDY CURRENT MEASUREMENTS. ...

A review on dissociative recombination between positive ions and negative ions of polycyclic aromatic hydrocarbons has been published. Accurate R-matrix calculations of dielectronic recombination of 0+ have been made. A new recombination process, tidal te...

We present high resolution measurements of dielectronic recombination (DR) of Fe XXII forming doubly excited Fe XXI. These measurements were performed at the Test Storage Ring (TSR) of the Max-Planck-Institute of Nuclear Physics (MPIK). Low-lying DR resonances allow precise energy determination of the doubly excited autoionising levels ...

Microwave photoconductive decay is widely used to measure the recombination lifetime in semiconductors and is generally considered to be a low-injection technique. Here, the authors examine the technique in detail from both a theoretical and experimental perspective. When the skin or penetration depth is much less than the sample thickness, the ...

Measurements of Atomic Recombination in the HERMES Polarized Hydrogen and Deuterium Storage Cell in storage rings. In case of polarized hydrogen or deuterium targets, recombination of the atoms occurs or deuterium recombination. The most likely reason for this is that the chemical binding energy of a hydrogen

The formation mechanisms of K? emission from hot low-density plasmas are analysed on the basis of accurate measurements of the He-like tokamak spectra carried out over a wide range of plasma conditions. The analysis is supported by the improved calculations of the relevant atomic data. The main focus was made on a study of ...

Coaxial electron beams and multiply charged ion beams are used to study dielectronic recombination. The study includes recombination of boron, carbon and sulfur. 3 refs., 7 figs. (WRF)

... calculations was to predict differential cross-sections for 3-body recombination so that future measurements with the imaging spectrometer that was ...

... photoionization measurements below the lithium fluoride cutoff ... fusion (D ), recombination ( a is the recombination ... which are present in the plasma. ...

... Experiments were performed to measure the coefficients for electron attachment, electron-ion recombination, electron-molecule collisions, and ion ...

The identification and measurement of a hydrogen recombination mechanism in nickel-cadmium cells has

(ASI) for accurate measurement of the Earth gravitomagnetic field (Lense- Thirring effect). We descibe the status of this experiment that will be launched ...

Make accurate measurements of length, volume, weight, elapsed time, rates, and temperature by using appropriate devices.

... Accession Number : ADD345295. Title : How and Why to Measure Magnetism Accurately,. Corporate Author : Personal Author ...

... Accession Number : ADD303179. Title : ACCURATE MEASUREMENT OF POISSON'S RATIO IN SMALL SAMPLES. Corporate Author : ...

... ACCURATE CRACK DEPTH MEASUREMENTS IN WELDED ASSEMBLIES (2B16 ... ABILITY TO ESTIMATE THE SIZE OF CRITICAL DEFECTS WITH ...

... for recombination are included together with a ... for measuring carrier lifetime. ... Descriptors : *CHARGE CARRIERS, PHOTOCONDUCTIVITY, BAND ...

We discuss the measurement and analysis of current vs. voltage (I-V) characteristics of organic and dye-sensitized photovoltaic cells and modules. A brief discussion of the history of photovoltaic efficiency measurements and procedures will be presented. We discuss both the error sources in the measurements and the strategies to ...

We report radio recombination line (RRL) and continuum observations of a sample of 106 Galactic H II regions made with the NRAO 140 Foot (43 m) radio telescope in Green Bank, West Virginia. We believe this to be the most sensitive RRL survey ever made for a sample this large. Most of our source integration times range between 6 and 90 hr, yielding typical rms noise levels of ...

Iron ions provide many valuable plasma diagnostics for cosmic plasmas. The accuracy of these diagnostics, however, often depends on an accurate understanding of the ionization structure of the emitting gas. Dielectronic recombination (DR) is the dominant electron-ion recombination mechanism for most iron ions in cosmic plasmas. Using ...

The results of a combined experimental and modeling study of charge transport, recombination and light emission in blue organic light-emitting diodes (OLEDs) based on a polyfluorene derivative are presented. It is shown that the measured temperature-dependent current-voltage curves and the voltage-dependent current efficiency are ...

Dielectronic recombination (DR) is the dominant electron-ion recombination process for most ions in both photoionized and collisionally-ionized plasmas and plays a central role in determining the charge state balance and spectra of these plasmas. Accurate DR rate coefficients are thus essential for modeling astrophysical plasmas. We ...

Accurate determination of electronic transport properties of semiconductor wafers with modulated free carrier absorption (MFCA) and multiparameter fitting requires the total elimination of instrumental response from the MFCA signals. In this paper, an approach to eliminate the effect of instrumental response on the frequency dependence of MFCA amplitude and phase is developed ...

Despite being an important collisional process in cold plasmas, three-body recombination (3BR) is described by a rate expression that has yet to be strongly confirmed for very low electron temperatures. While the low temperature 3BR rates have recently been measured in an ultracold plasma, the strong temperature dependence (T-9/2) of the 3BR rate ...

We have developed a new method for measuring the cross section for the 52P1/2?52P3/2 transition of atomic iodine in photodissociation lasers. The inverse recombination of iodine atoms is monitored via dynamic self-diffraction of the laser radiation in the active medium. We have measured the cross section in mixtures of H-C3F7I and CF3I ...

From first principles it is demonstrated that there are three hole transport and recombination parameters in heavily doped n-type silicon: the hole equilibrium concentration, the lifetime, and the diffusion coefficient. In steady-state, however, only two combinations of these three fundamental parameters are relevant: the hole equilibrium concentration - diffusion coefficient ...

Photoinduced electron transfer and geminate recombination in the group head region of micelles-probe spectroscopic study of photoinduced forward electron transfer and geminate recombination between donors to determine the geminate recombination dynamics is presented. These experiments are the first to measure

Measurements of the dissociative Recombination and Excitation of HeH(+), the dissociative excitation of H3(+), the branching ratio for the decay channels for H(+)(3) (v= O) recombination and the cross section for the recombination of H2(+) (v = O) have be...

Dielectronic Recombination is an important electron-ion recombination process which affects many aspects of plasmas. This work presents experimental measurements of relative dielectronic recombination cross sections for three highly charged ions: hydrogen...

(1s/sup 2/nl - 1s2pnl, n greater than or equal to 3) dielectronic satellites of the resonance line of Fe XXV at 1.85 A have been observed from PLT (Princeton Large Torus) tokamak discharges and are used for a detailed comparison with theory. The necessary corrections for Doppler broadening measurements are discussed, and accurate satellite to resonance ...

In reactors. heavy water undergoes various modifications in its physical chemical properties. These modifications are caused by radioactivation of the atoms forming the molecule, decomposition by the various types of radiation, chemical pollution by the substances with which the water is in prolonged contact, and ieotopic pollution by atoms of light hydrogen. Theoretical considerations ...

A soluble receptor binding assay has been developed for measuring human interleukin-1 alpha (IL-1 alpha), human IL-1 beta, and mouse IL-1 alpha. The assay is based on a competition between unlabeled IL-1 and 125I-labeled mouse recombinant IL-1 alpha for binding to soluble IL-1 receptor prepared from mouse EL-4 cells. The assay measures ...

Nulling interferometry requires, among other things, a symmetric recombination module and an optical path difference control system. The symmetric recombination stage has been particularly studied over the last ten years and several concepts are now well known. One of them is the "Modified Mach Zehnder" (MMZ) interferometer, proposed by Serabyn and ...

The quantum efficiency (QE) of an imaging detector can be increased by utilizing a thick, high-density detection medium to increase the number of quantum interactions. However, image quality is more accurately described by the detection quantum efficiency (DQE). If a significant fraction of the increase in the number of detected quanta from a thick, dense detector were to ...

The spatial brightness profiles of Ar and Kr ions have been measured during a set of experiments in which these gases were puffed into FTU (Frascati Tokamak Upgrade) and Alcator C-Mod tokamak plasmas. These profiles were measured by spatially scanning photometrically calibrated vuv and x-ray spectrometers covering 3 to 1700 Aa on a shot to shot basis. ...

Velocity measurements by the correlation method were assessed and found to be accurate measures. The wide range of applications of the correlation method are discussed.

investigated the impact of some recent improvements in the treat- ment of hydrogen recombination which in the accurate evaluation of the recombination history (e.g. the problem of radiative transfer in hydrogen of hydrogen recombination (see Sect. 2.2). The basic conclusion is that, with our current understand- ing

A wide range radioactive gas concentration detector and monitor which is capable of measuring radioactive gas concentrations over a range of eight orders of magnitude. The device of the present invention is designed to have an ionization chamber which is sufficiently small to give a fast response time for measuring radioactive gases but sufficiently large ...

The NO-O chemiluminous recombination is one of the most thoroughly studied small molecular reactions. The temperature dependence of the NO-O reaction has received less attention. An accurate knowledge of the temperature dependence is required to predict, ...

... described that aid in handling cultures of fungi more accurately ... makes possible accurate quantitative measurements of lineal fungus growth rate or ...

... Author : NAVAL RESEARCH LAB WASHINGTON DC ... examined three different methods of endotoxin ... Amebocyte Lysate (LAL) assay to accurately ...

... treatments; (3) completion of a study of the ... the theoretical basis for accurate measurement of small ... of a first exploratory interlaboratory evaluation of ...

Magsat, designed for making measurements of the geomagnetic vector field, is evaluated. For accurate

The objective of this study was to determine the accuracy of bone density measurement with a new OCT

... REFLECTOMETER IN THE OVERLAPPING SPECTRAL RANGE BETWEEN ... THE UNCERTAINTY OF THE REFLECTANCE MEASURED BY IT IS ...