✦ LIBER ✦

CARS studies on the heterogenous relaxation of vibrationally excited hydrogen and deuterium

✍ Scribed by J. Arnold; T. Bouché; T. Dreier; J. Wichmann; J. Wolfrum

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 495 KB
Volume: 203
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)85402-a

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✦ Synopsis

Wall deactivation rates for H*(Z)= 1) J? H*(u=O) and D*(v= I ) 2 D2 (v= 0) were measured by probing the vibrationally excited molecules with coherent Anti-Stokes Raman spectroscopy. The probabilities for vibrational relaxation at room tempera-turewerefoundtobey=(3,5&0,6)XlO-'forquartz, (1.2+0.2)x10-'forpyrex, (1.1?0.2)xlO-'forHF-cleanedpyrexwalls and (0.5 + 0.1) x 1 Oe3 for Pyrex coated with highly fluorinated teflon. The temperature dependence of the heterogeneous relaxation was studied in the temperature range 1 ES-300 K. The wall deactivation rate for quartz increases with increasing temperature according to y(T)=(5.9fl)~l0-~exp[-(ll80+340) J mol-'/RT] for hydrogen and to y(T)=(6.7*1.1)XlO-'

x exp [ -( 1340 + 400) J mol-'/RT] for deuterium.

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