Collisional energy transfer in Na(4p–3d)–He,H2 collisions

15 January 1993

journal article
research article
Published by AIP Publishing in The Journal of Chemical Physics

Vol. 98 (2) , 1101-1104
https://doi.org/10.1063/1.464333

Abstract

We have investigated the direct collisional energy transfer process Na*(4p)+M→Na*(3d)+M, where M=He,H2 under gas cell conditions. We have measured the temporal profiles of the Na(3d–3p) sensitized fluorescence as a function of quenching gas pressure and fit the profiles to a two-state rate equation model to obtain the quenching rate coefficients from the Na*(4p) state. The total energy transfer rate coefficient out of the 4p state for He is small [(0.5±0.2)×10−10 cm3/s]. The total quenching rate coefficient out of the 4p state is much larger for H2[(3.9±0.5)×10−10 cm3/s]. Evidence suggests that the energy transfer rate coefficient for the 4p–3d process is ∼2.0×10−10 cm3/s with the remainder of the 4p quenching being predominantly reactive. We also compare the far-red wing absorption line shapes for the NaHe and NaH2 systems.

Keywords

This publication has 22 references indexed in Scilit:

Nascent rotational quantum state distribution of NaH (NaD) from the reaction of Na*(4 2P) with H2, D2, and HD
The Journal of Chemical Physics, 1992
Reactive collision dynamics of Na*(4 2P)+H2 and HD: Experiment and theory
The Journal of Chemical Physics, 1992
Semiclassical model for electronic-to-vibrational energy transfer in collisions of Hg(63P2) with H2, D2, and HD
The Journal of Chemical Physics, 1991
Quantum-mechanical study of nonreactive collisions between Rb(5 ${}^{2}P$ ) and $H_{2}$ or $D_{2}$ $(^{1}$ $Σ_{g}^{+}$ ,v=0)
Physical Review A, 1987
Pseudopotential molecular-structure calculations for alkali-metal-atom– $H_{2}$ systems
Physical Review A, 1985
Model for fine-structure transitions in collisions of K(4²P) and Rb(5²P) with H₂and N₂
Journal of Physics B: Atomic and Molecular Physics, 1982
Angular Distributions for a Model System of Nonadiabatic Molecular Collisions: The Quenching of ${Na}^{*} (3 p)$ by $H_{2}$ and $D_{2}$
Physical Review Letters, 1982
Collisions of excited Na atoms with H2 molecules. I. A b i n i t i o potential energy surfaces and qualitative discussion of the quenching process
The Journal of Chemical Physics, 1981
Nonadiabatic Coupling in Fine-Structure Transitions of Alkali Atoms Induced by Diatomic Molecules
Physical Review Letters, 1981
Collisional deactivation of the $5 s$ and $4 p$ states of Na by $N_{2}$
Physical Review A, 1978