Abstract
Single rotational states were populated in vibrationally excited hydrogen by stimulated Raman pumping. The population in H2 X 1∑+g(v″=0,1) and D2 X 1∑+g(v″=0,1) was probed state selectively by tunable vacuum ultraviolet (VUV) laser radiation around λ=110 nm, and the fluorescence induced when exciting the hydrogen molecules in the (0–0), (1–0), (2–0), (3–1), and (4–1) Lyman bands of the (B 1∑+u←X 1∑+g) transition monitored. From a comparison of line heights, the stimulated Raman pumping efficiency is estimated to be 30%–50% in the focal volume. Rotational transitions in X 1∑+g(v″=1) were induced in collisions with H2, D2, and He. State-to-state rotational relaxation rates were measured for the (J″=1→J″=3) transition in H2(v″=1) and for the (J″=2→J″=0,4) transitions in D2(v″=1). These rates were found to be generally higher than the corresponding previously determined ones in ground state hydrogen, in qualitative accord with recent theoretical calculations. A comparison with available theoretical state-to-state cross sections shows that the rates obtained with these cross sections are generally lower than the relaxation rates directly measured in this work.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 9:02 a.m.) |
Deposited | 1 year, 6 months ago (Feb. 10, 2024, 12:02 a.m.) |
Indexed | 1 month, 2 weeks ago (July 16, 2025, 8:39 a.m.) |
Issued | 39 years ago (Sept. 1, 1986) |
Published | 39 years ago (Sept. 1, 1986) |
Published Print | 39 years ago (Sept. 1, 1986) |
@article{Meier_1986, title={State selective population of H2(v″=1, J″=1) and D2(v″=1, J″=2) and rotational relaxation in collisions with H2, D2, and He}, volume={85}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.451068}, DOI={10.1063/1.451068}, number={5}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Meier, W. and Ahlers, G. and Zacharias, H.}, year={1986}, month=sep, pages={2599–2608} }