Journal
CHEMICAL PHYSICS LETTERS
Volume 610, Issue -, Pages 8-13Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2014.07.021
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Funding
- Russian Foundation for Basic Research [12-03-00170-a]
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Photogeneration of singlet oxygen O-2(a(1) Delta(g)) resulted from photoexcitation at 248 and 266nm of isoprene-oxygen mixtures at elevated oxygen pressure has been investigated. Pulse energy and oxygen pressure dependence of the singlet oxygen yield indicate one-quantum photoexcitation of the encounter complex isoprene-oxygen C5H8-O-2 as a source of O-2(a(1) Delta(g)). Suggested mechanism of O-2(a(1) Delta(g)) photo generation involves direct excitation of complex with simultaneous change of both partner spins like that observed in van der Waals complex C5H8-O-2 [Vidma et al., J. Chem. Phys. 137 (2012) 054305]. Other supposed pathways involve collision-induced photogeneration of Herzberg III state O-2(A'(3) Delta(g)) or triplet isoprene as the intermediates. (C) 2014 Elsevier B.V. All rights reserved.
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