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Dicyanoacetylene photodissociation at 193 nm and at 248 nm studied by transient absorption spectroscopy. Production of CN, C2 and C3N

✍ Scribed by Robert Kołos; Zbigniew Zieliński; Zbigniew R. Grabowski; Tadeusz Mizerski

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 670 KB
Volume: 180
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(91)87119-v

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✦ Synopsis

Laser photolysis of dicyanoacetylene at 193 nm and at 248 nm, leading to the production of CN, C, and (probably) &N, has been investigated. CN violet bands and Cz Swan bands were observed in absorption. Photolysis at 193 nm produces CN in both the X %+ and in the A 'II, manifolds, the latter -probably populated via a two-photon process -being revealed by a delayed (collision-induced) population of higher vibrational levels of the ground electronic state. Photolysis at 248 nm is an efficient twophoton process. It is still not clear what mechanism is responsible for the formation of the Cz molecule at 193 nm. Throughout the paper, the theoretical results of Sadlej and Roos helped to choose the optimal interpretation of the experiments.

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