Elimination and migration of hydrogen in the vacuum-ultraviolet photodissociation of pyridine molecules. (6th December 2016)

• Record Type: Journal Article
• Authors: Wasowicz, Tomasz J; Dąbkowska, Iwona; Kivimäki, Antti; Coreno, Marcello; Zubek, Mariusz
• Is Part Of: Journal of physics. Volume 50:Number 1(2017:Jan. 01)
• Publication Date: 2016-12-06
• Subjects: pyridine -- photodissociation -- hydrogen migration -- superexcited states; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/1361-6455/50/1/015101
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: Elimination of the excited hydrogen atoms H( n ), n = 4–7, and hydrogen migration in formation of the excited NH( A 3 Π) free radicals in the photodissociation of pyridine, C5 H5 N, 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( A 3 Π) 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.