Velocity relaxation of fast hydrogen atoms by collisions with rare cases, N-2, O-2, and N2O

Citation
Sk. Shin et al., Velocity relaxation of fast hydrogen atoms by collisions with rare cases, N-2, O-2, and N2O, J PHYS CH A, 104(7), 2000, pp. 1400-1404
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHYSICAL CHEMISTRY A
ISSN journal
1089-5639 → ACNP
Volume
104
Issue
7
Year of publication
2000
Pages
1400 - 1404
Database
ISI
SICI code
1089-5639(20000224)104:7<1400:VROFHA>2.0.ZU;2-Q
Abstract
Velocity relaxation of fast hydrogen atoms colliding with rare gas atoms, N -2, O-2, and N2O molecules has been investigated by measuring Doppler broad ened H atom spectra. The fast hydrogen atoms were generated by photodissoci ation of H2S at 243.2 nm, and the H atom spectra were measured by two photo n absorption laser induced Lyman-alpha fluorescence. The H atom spectra sho w an anisotropic velocity distribution with the anisotropy parameter, beta = -1.0 +/- 0.05, without any colliding gases. Degradation of the anisotropy of the angular distribution was measured as a function of pressure of the colliding gases, He, Ar, Kr, N-2, O-2, and N2O and the collision cross sect ions for velocity direction change were measured.