Picosecond observation of electronic quenching. Br(2P12)+I2(ν=0)→Br(2P32)+I2(ν > 0) by geometrically restricted reaction
✍ Scribed by Scott A. Wright; Matthew F. Tuchler; J.Douglas McDonald
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 645 KB
- Volume
- 226
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
AbStTWt A picosecond time-resolved study of the interaction of Br with Is is presented. The bromine atom is formed by photodissociation of the HBr in the van der Waals dimer HBrIs at 220 nm. The resultant molecular products are detected by picosecond REMPI. We see primarily vibrationally excited 1s with only a tiny amount of IBr visible to our REMPI scheme. Results show an interaction beginning on the spin-orbit excited reaction potential surface (Br(*P,,s) +Ia). The electronically excited BrIs complex internally converts to the one of the two states which correlate to ground state atoms on a time scale of 5 1 ps. The system then quickly dissociates resulting in vibrationally excited I2 and a ground state bromine atom.