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Phosphorescence from indirectly excited 3B1 vibrational levels of jet-cooled SO2

✍ Scribed by F. Al-Adel; E. Hegazi; A. Hamdan; A. Dastageer

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 691 KB
Volume: 236
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(95)00245-y

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✦ Synopsis

A supersonic jet of 502, seeded in Ar, wag crossed with a 301.9-304.3 nm tilted laser beam and the resulting luminescence spectrum from the collisionally populated low SO 2 vibronic levels was measured under different molecular beam parameters. The spectrum was found to originate from two distinct sets of upper levels which were described in terms of the ]A 2 and 3B! vibrational levels. Collisions of SO~-Ar type were found to favor ~A 2 ---~3Bj intersystem crossing and appeared to dominate at high rovibronic temperatures, while SO~-SO~ collisions favored the reverse intersystem crossing 1 3 A 2 ~ B~. The results also suggest that the reason why the earlier value of the 3B i ~ ~A] phosphorescence quantum yield appeared to increase at low SO 2 pressure could be attributed to some collision-induced vibrational transitions that lie in the same spectral region.

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