Effects of translational energy and moderators on vibrational excitation of carbon dioxide by hot hydrogen atoms

Abstract

The collisional thermalization of hot H atoms produced by the excimer laser photolysis of H2S (193 nm) and HI (193 and 248 nm) has been determined by measuring the decrease in vibrational excitation of CO2 (ν3) as a function of moderator pressure. Cross sections obtained for the rare gases in this way are in reasonable agreement with those calculated for energy loss in hard-sphere collisions. These experiments also indicate that the efficiency of vibrational excitation increases as the relative translational energy increases.

Modelling of the power dissipation and rovibrational heating and cooling in SiH4-H2RF glow discharges

“…Using the enthalpies of formation from Ho et af (1985), values of AEed~ = 4.33 eV, AE,~I = 1.3 eV, and AEedS2 = 4.4 eV are derived (see (1985) determined a thermalization rate constant kz,% F;: 6.0 x IO7 s-' Torr-'. For hot H atoms on SiI& the thermalization rate is essentially govemed by collision with one H atom of the molecule as is the case for polyatomic hydride molecules such as alkanes (Alfassi and Amiel 1972) or H2S (McGee et al 1985). Therefore the corresponding thermalization rate constant for collisions on Si& should be similar to that of determined for H2S: k$,sib x 18x IO7 s-' Torr-'.…”

Vibrational and Rotational Excitation of Small Molecules in Collisions with Hot H and D Atoms

“…Infrared fluorescence experiments to determine the moderator effects of rare gases on hot Η atoms have also been carried out [8]. Emission from C0 2 (i> 3 ) produced by collisions with hot atoms is monitored as the partial pressure or mole fraction of moderator is increased in a sample mixture.…”

Reaction and electronic excitation in crossed-beams collisions of low-energy O(3P) atoms withH2Orient1, Chutjian2, Murad3 1990Phys. Rev. Lett.280130View full textAdd to dashboardCite

“…17 A total of 102 individual transitions, together with a visual estimate by Gaydon of their intensity (on a scale of 1-5), was included in the summation of Eq. (2).…”