... WITH HYDROGEN ARCS 2: THE HIGH POWER ARC AS AN ABSOLUTE STANDARD OF SPECTRAL RADIANCE FROM 124 NM TO 360 NM IN ...

A low-pressure hydrogen discharge lamp was calibrated for radiant intensity in the vacuum ultraviolet spectral region on an absolute basis and was employed as a laboratory standard source in spectrograph calibrations. This calibration was accomplished thr...

We have demonstrated that the content of hydrogen in carbon-based films can be reliably calculated from a measurement made either directly using forward recoiled hydrogen or indirectly using backscattered helium. The method makes use of the surface signal height ratio of a sample of unknown composition to a standard of known ...

... Title : CRYOGENIC ABSOLUTE RADIOMETERS AS LABORATORY IRRADIANCE STANDARDS, REMOTE SENSING DETECTORS, AND ...

Nuclear resonance reaction analysis (NRRA) was used to determine hydrogen depth profiles in CVD diamond films. Diamond samples prepared by microwave-assisted CVD of CH4/H2 mixtures contained a wide range of bulk hydrogen concentration. To investigate the dehydrogenation mechanism for deep trap activation proposed by Landstrass and Ravi, the measured ...

A 400 mc Ra-- Be photoneutron source was adopted as the national standard source. It was calibrated by the method of absolute determination of Mn/ sup 56/ produced in the Mn/sup 55/(n, gamma )Mn/sup 56/ reaction. The calibration agrees within 1% with an international average. The standard error is plus or minus 1%. The ...

The primary UV radiometric calibration standards of the Atomic and Plasma Radiation Division of the NBS are the hydrogen arc and the blackbody line arc. The secondary standards are the argon mini- and maxiarcs, and the deuterium arc lamp. Calibration methods involving both spectral radiance and irradiance, as well as the evaluation of ...

An absolute radiation standard is constructed for use between 200 and 2000 microns. It is demonstrated that the output is that of a blackbody over this wavelength range. The absolute standard is used to calibrate a secondary standard mercury-arc lamp whic...

The paper describes the development of an absolute calibration standard for irradiance measurements.

Light source having absolute spectral energy distribution for standardizing star tracker calibration

Solution-phase, half-cell potentials are measured relative to other half-cell potentials, resulting in a thermochemical ladder that is anchored to the standard hydrogen electrode (SHE), which is assigned an arbitrary value of 0 V. A new method for measuring the absolute SHE potential is demonstrated in which gaseous nanodrops ...

Solution-phase, half-cell potentials are measured relative to other half-cell potentials, resulting in a thermochemical ladder that is anchored to the standard hydrogen electrode (SHE), which is assigned an arbitrary value of 0 V. A new method for measuring the absolute SHE potential is demonstrated in which gaseous nanodrops ...

The concept of the absolute half-cell potential is discussed from a simple thermodynamic point of view and defined as -..delta..G/ne for the half-cell reaction, treating the electron like other individual chemical species. With the standard reference state of the electron taken as the free electron at rest at infinity, the absolute ...

A method for the production of t-butoxy radicals by the photolysis of t-butyl hypochlorite was employed to determine the absolute rate of combination of t-butoxy radicals at room temperature and to determine the absolute rate of hydrogen atom abstraction ...

The reaction of tert-butoxy radicals with diphenylmethanol and with cumene was examined using nanosecond laser flash photolysis techniques in order to determine the absolute values of the rates of reaction of the radicals. The absolute rate measured for both substrates compare favorably with the values for the benzophenone triplet. (JSR)

Page 1. AFRL-VS-HA-TR-2004-1109 Absolute Infrared Calibration of Standard Stars by the Midcourse Space Experiment SD Price C. Paxson ...

Absolutely calibrated ultraviolet stellar spectra from 3100 A to the hydrogen absorption edge at 912

... COUNTING METHODS, *TRITIUM, *HALF LIFE, HYDROGEN, GASES ... AND NUCLEAR CHEMISTRY ISOTOPES ATOMIC AND MOLECULAR ...

... Hydrogen iodide acted as an excellent radical "trap" for these radicals. No spontaneous decomposition of acetyl radicals was observed. Relative ...

... POINTS OF LIQUID NITROGEN AND HYDROGEN. I. THE MEAN ATOMIC SPECIFIC HEATS AT 50 DEGREES ABSOLUTE OF THE ELEMENTS A ...

The results of absolute determination of the specific radioactivity of tritiated water on the basis of the measured disintegration rate of tritium by the internal gas counting method are presented. Two reducing agents, uraniurm and zinc, were used to convert the water into the gaseous state. The absolute dism- tegratlon rate of tritium per unit ...

An absolute method for heavy water standardization is described which is based on linear extrapolation to 100% D/sub 2/O. The method uses a reflux column attached to a boiler containing the sample to be standardized. With the column operating at equilibrium under total reflux, samples from both the top and bottom of the column are ...

The absolute square of the normalized position-space wave function of the electron in a hydrogen atom is interpreted as the probability distribution for observations of the position of the electron. This is only a thought experiment, since the electron's ...

Rate constants for the reaction of atomic chlorine with hydrogen are measured from 200 - 500 K using

In solution, half-cell potentials are measured relative to other half-cells resulting in a ladder of thermodynamic values that is anchored to the standard hydrogen electrode (SHE), which is assigned an arbitrary value of exactly 0 V. A new method for measuring the absolute SHE potential is introduced in which reduction energies of ...

In solution, half-cell potentials are measured relative to those of other half cells, thereby establishing a ladder of thermochemical values that are referenced to the standard hydrogen electrode (SHE), which is arbitrarily assigned a value of exactly 0 V. Although there has been considerable interest in, and efforts toward, establishing an ...

In solution, half-cell potentials are measured relative to those of other half cells, thereby establishing a ladder of thermochemical values that are referenced to the standard hydrogen electrode (SHE), which is arbitrarily assigned a value of exactly 0 V. Although there has been considerable interest in, and efforts toward, establishing an ...

Links Hydrogen Delivery Hydrogen Storage Fuel Cells Technology Validation Codes & Standards Education Systems Analysis Photo of hydrogen researcher. Hydrogen can be produced...

The experimental procedure of Yoshino and Bernstein for the measurement of Raman intensities of gases has been simplified and the apparatus adapted to the investigation of the spectra of vapors. For absolute intensities the pure rotation line J = 1 --> 3 of hydrogen was used as an internal standard as suggested by Golden and ...

The spectral energy distributions for pure-hydrogen (DA) hot white dwarfs can be accurately predicted by model atmospheres. This makes it possible to define spectrophotometric calibrators by scaling the theoretical spectral shapes with broad-band photometric observations - a strategy successfully exploited for the spectrographs onboard the Hubble Space Telescope (HST) using ...

... by time averaging the syndrome detection from ... a Hamming (15,11) single error detecting and ... only the absolute delay, since correct absolute delays ...

It is proposed to use radiation from a femtosecond laser for absolute length measurements. The possibility of creation of a unified frequency and length standard is shown. (laser applications and other topics in quantum electronics)

a market-receptive environment for commercializing hydrogen-based products and systems. The Hydrogen, Fuel of hydrogen-related codes and standards that will ensure the safe production, delivery, and use of hydrogen and facilitate the timely and efficient incorporation of ...

... Accession Number : ADA293930. Title : Optical Frequency Standards: Hertz-Level Working Standards and their Absolute Frequency Measurement. ...

Contents: Absolute spectrofluorometry; Absolute quantum efficiencies; Phosphorimetry; Measurements of absolute values in biochemical fluorescence spectroscopy; Newer fluorometric methods for the analysis of biologically important compounds; Inorganic ions...

Contents: The reduction of uncertainties for absolute piston gage pressure measurements in the atmospheric pressure range; Absolute isotopic abundance ratios and atomic weight of a reference sample of nickel; The absolute isotopic composition and atomic w...

...pressure of approximately one atmosphere, absolute. This determination...pressure of approximately one atmosphere, absolute, in Btu/lb...pressure of approximately, one atmosphere, absolute, in °F. (b...tank must be insulated with a layer of glass fiber...

By using external-gain, hydrogen-maser oscillations were obtained at cavity Q values and beam intensities far below those required for a conventional hydrogen maser. Frequency-pulling measurements and absolute frequency determinations of the hydrogen mase...

This paper reviews recent progress in the field of hydrogen production by photosynthetic water splitting for both in vitro and in vivo systems. Absolute thermodynamic efficiencies of conversion of light energy into energy of molecular hydrogen by intact m...

A high-precision absolute radiometer with a thermally stabilized cavity as the receiving element was designed in 1984 at the All-Union Research Institute for Optical and Physical Measurements (VNIIOFI) and used to derive the USSR National Special Standard of the solar irradiance unit. Since that time, the radiometer has been developed further. The ...

... Descriptors : *CRYOGENICS, *MASERS, *FREQUENCY STANDARDS, *ATOMIC CLOCKS, HYDROGEN, COATINGS, CARBON TETRAFLUORIDE ...

The thermochemical properties for selected hydrogenated silicon clusters (Si(x)H(y), x = 3-13, y = 0-18) were calculated using quantum chemical calculations and statistical thermodynamics. Standard enthalpy of formation at 298 K and standard entropy and constant pressure heat capacity at various temperatures, i.e., 298-6000 K, were ...

The Born-Oppenheimer approximation of uncoupled electronic and nuclear motion is a standard tool of the computational chemist. However, its validity for molecule-metal surface reactions, which are important to heterogeneous catalysis, has been questioned because of the possibility of electron-hole pair excitations. We have performed experiments and calculations on the ...

A plot of electron affinity (EA) and ionization potential (IP) versus energy band gap (EG) for 69 binary closed-shell inorganic semiconductors and insulators reveals that EG is centered about the hydrogen donor / acceptor ionization energy ?(+/-). Thus, ?(+/-), or equivalently the standard hydrogen electrode (SHE) energy, functions as ...