Elimination and migration of hydrogen in the vacuum-ultraviolet photodissociation of pyridine molecules

Elimination of the excited hydrogen atoms H(n), n = 4-7, and hydrogen migration in formation of the excited NH(A3 ) free radicals in the photodissociation of pyridine, C5H5N, molecules have been studied over the 17.5-70 eV photon energy range. In the measurements the photon-induced fluorescence spec...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2017-01, Vol.50 (1), p.15101
Main Authors: Wasowicz, Tomasz J, D bkowska, Iwona, Kivimäki, Antti, Coreno, Marcello, Zubek, Mariusz
Format: Article
Language:English
Subjects:
hydrogen migration
photodissociation
pyridine
superexcited states
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Summary:Elimination of the excited hydrogen atoms H(n), n = 4-7, and hydrogen migration in formation of the excited NH(A3 ) free radicals in the photodissociation of pyridine, C5H5N, molecules have been studied over the 17.5-70 eV photon energy range. In the measurements the photon-induced fluorescence spectroscopy technique has been applied. Both fragments are produced through excitation of pyridine molecules into higher-lying superexcited Rydberg or doubly excited states. The mechanisms for fragmentation of pyridine into H(n) and NH(A3 ) are discussed. Ab initio quantum chemical calculations have been performed to elucidate the hydrogen migration mechanism in the NH formation, which is not a self-contained unit in the structure of pyridine.
ISSN:0953-4075
1361-6455
DOI:10.1088/1361-6455/50/1/015101