Results 251 to 260 of about 39,209 (300)

Rate of Recombination of Nitrogen Atoms

The Journal of Chemical Physics, 1958
The rate of recombination of nitrogen atoms by three-body collision has been determined at room temperature and 0.5–1.3 mm pressure. The nitrogen was dissociated (about 3–6% nitrogen atoms) in a condensed discharge and pumped continuously through a glass tube 4.2 cm i.d. and 2.5 m long.
Paul Harteck, Robert R. Reeves, Gene Mannella   +2 more
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Rate of recombination of nitrogen atoms

The Journal of Chemical Physics, 1979
Decays of the concentration of N(4S) atoms in the Lewis–Rayleigh nitrogen afterglow were measured in a static mode, with a mass spectrometer that was calibrated against NO titration. The rate constant for recombination of N(4S) atoms with N2 molecules as the third body [N(4S)+N(4S)+N2→N2+N2] was determined as 7.2×10−33 cm6 molecule−2 sec−1.
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Effects of nonequilibrium plasmas on atomic reaction rates

Physical Review E, 1994
The influence of electron-density fluctuations on atomic reaction rates is studied in a hydrogen model plasma. We show that the effective ionization rates are found to be extremely sensitive to deviations of the electron density from the local thermal equilibrium (LTE) distribution, while the effective recombination rates are relatively stable against ...
, Li, , Hahn
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Should atoms be X-rated?

Journal of Chemical Education, 1986
Two cheers for atoms. Three cheers for the elements. Atoms are optional. Elements are essential. Elements without atoms, formulas, and equations are o.k.
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Characterizing fluorine and chlorine atom flow rates using iodine atom spectrometry

AIAA Journal, 2001
The production of F and Cl atoms in an electrical discharge of F 2 or Cl 2 has been examined in a flow reactor. A tunable diode laser was used to probe the concentration and translational temperature of I atoms produced by F and Cl atom reactions with HI.
Gerald C. Manke, Thomas L. Henshaw, Timothy J. Madden, John M. Herbelin, Brent D. Rafferty, Gordon D. Hager   +5 more
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Rate of addition of bromine atoms to ethylene

Canadian Journal of Chemistry, 1970
The rate of combination of bromine atoms in the photosensitized hydrobromination of ethylene has been determined by the rotating sector technique. From this and kinetic data reported previously the rate constant for the addition of bromine atoms to ethylene in the presence of 380 Torr of propane as deactivating gas has been calculated to be 1.5 ± 0.3 ×
K. T. Wong, D. A. Armstrong
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Historical Note on the Rate of a Moving Atomic Clock

Journal of the Optical Society of America, 1947
The history of the idea of variation of frequency with velocity is followed through Voigt, Larmor, Lorentz, and Einstein. The Michelson-Morley experiment is explainable by any contraction of dimensions in the ratio (1−υ2/c2)12:1 along and transverse to the direction of motion. To each contraction corresponds a different value of frequency change.
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Atomic radiation rates in photonic crystals

Physical Review B, 2001
A photonic crystal, defined as a periodic dielectric structure, can influence the radiation rate of an embedded dipolar emitter. A theory of this effect is developed and the efficiency of a dipolar photonic source is calculated for a realistic three-dimensional crystal.
Lousse, Virginie, Vigneron, Jean-Pol, Bouju, Xavier, Vigoureux, Jean-Marie   +3 more
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Decay Rate of an Excited Atom in a Moving Medium

Physical Review Letters, 2005
The effect of a uniformly moving medium on the decay rate of an excited atom is calculated. When the local field effects are neglected, the free space decay rate is modified by a factor which is a complicated function of refractive index, permeability, and velocity of the medium.
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Temperature Dependence of Atomic Decay Rate

Chinese Physics Letters, 2012
We investigate the decay rate of an atom in a two-dimensional optical microcavity in which there exists a Bose-Einstein condensation of photons. It is found that below the critical temperature Tc, the atomic decay rate depends on the absolute temperature T. Especially, at absolute zero temperature almost all photons are in the condensate state, and the
Jian-Jun Zhang, Ze Cheng
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