Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa21a0229k&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA21A-0229
Physics
0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369), 6225 Mars
Scientific paper
The thermalization of hot nitrogen atoms in the terrestrial atmosphere is investigated. We calculate the rates of energy relaxation of fast nitrogen atoms in the gas of N2 and O2 and provide simple interpolative formulas for the N(4S) thermalization rates. The method of determination of the energy relaxation rate is based on the numerical solution of the Boltzmann kinetic equation, describing the evolution of the time- dependent distribution functions of fast nitrogen atoms. The rates of energy transfer in N(4S) + He, Ar, N2, and O2 collisions are determined using quantally computed differential cross sections of elastic and inelastic collisions. Theoretical data on the energy relaxation of hot N(4S) atoms are compared with the results of recent experiments on the thermalization of fast N(4S) atoms in He, Ar, N2, and O2 buffer gases. The laboratory measurements of the Doppler shifts of the laser induced fluorescence of hot N(4S) atoms provide detailed information on the time-evolution of energy distribution functions of N(4S) atoms, and we employ these data for testing the theoretical predictions. Results of our ab initio calculations are in good agreement with experimental data. We report also the parameters of the simplified hard sphere model, which describes effective energy relaxation rates of hot N(4S) atoms, thermalizing with initial energies between 0.05 and 5 eV in different gases.
Dalgarno Alexander
Kharchenko Vasili
Zhang Pei-Pei
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