Study of Excitation Transfer in a Flowing Helium Afterglow Pumped with a Tuneable Dye Laser. II. Measurement of the Rate Coefficient for the Rotational Relaxation of He₂(3p ³Π_g)

15 December 1972

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

Vol. 57 (12) , 5317-5321
https://doi.org/10.1063/1.1678223

Abstract

The rotational relaxation of the He2(3p 3Π g ) state is examined by optically pumping a flowing helium afterglow with a tuneable dye laser. The population of the J = 8 rotational state is enhanced by optically saturating the R 7 component of the transition connecting this state with the metastable He 2 (2s 3 Σ u + ) molecular state. From the lifetime and yield of the Q 7 component, the rate coefficient for the rotational relaxation via the forbidden ΔJ = 1 channel is determined to be of the order of 2× 10 −11 cm 3 / sec . It is found that this represents about half of the total rate of rotational relaxation in this state.

Keywords

This publication has 3 references indexed in Scilit:

Study of Excitation Transfer in a Flowing Helium Afterglow Pumped with a Tuneable Dye Laser. I. Measurement of the Rate Coefficient for Selected Quenching Reactions Involving He (53P)
The Journal of Chemical Physics, 1972
Cooperative Phenomena in Resonant Electromagnetic Propagation
Physical Review A, 1970
Rotational Energy Transfer in H2
The Journal of Chemical Physics, 1954

Study of Excitation Transfer in a Flowing Helium Afterglow Pumped with a Tuneable Dye Laser. II. Measurement of the Rate Coefficient for the Rotational Relaxation of He2(3p 3Πg)

Abstract

Keywords

Study of Excitation Transfer in a Flowing Helium Afterglow Pumped with a Tuneable Dye Laser. II. Measurement of the Rate Coefficient for the Rotational Relaxation of He₂(3p ³Π_g)