Emission excitation spectra and photochemistry of the 3820 Å band system of propynal

✍ Scribed by Davinder Kumar; J.Robert Huber

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 551 KB
• Volume: 38
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(76)80034-6

✦ Synopsis

The ffuorcscence and phosphorescence excitation spectra ofpropynaf i~t 0.60 torr with ;md without an added 100 torr He WXP measured up to an excess vibrational energy of 6000 cm-' above the zero-point level of Sl(*A"). Over the same ener,y range, the relative quantum yield of the photopIoduct CO ws determined as a function of the excess encr_g. From these data it is suggested that the singlet Sr is the photochcmi&y active state, and that the coifision-induced intersystem crossing process governs the photochemistry. (1974) 2487. * Vibkional relaxation within S1 is not appreciable with respect to IC and ISC even with 100 torr of He. The evidenck for this is found in the similar vibr;ltional pattern of the fluorescence exci'tation spectra with and without the foreign gas. (Ef vibrational relqation were dominant, the excitation spectm~ should fqllow the absorption spectmm at !eaSt Up_tO Evib.