UV photolysis of nitromethane studied by sub-picosecond time-resolved CARS experiments

Journal Article · Mon Apr 01 00:00:00 EST 1996 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.50152· OSTI ID:21163639

Rajchenbach, C; Jonusauskas, G; Rulliere, C ^[1]

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1. Centre de Physique Moleculaire Optique et Hertzienne (CPMOH), U.A. CNRS No 283 Universite de Bordeaux I, 351 cours de la Liberation 33405 Talence, Cedex (France)

Using sub-picosecond CARS experiment we observed direct photolysis of liquid nitromethane after pulse excitation at 299 nm. We measured the dynamics behavior under excitation of three main ground state Raman lines: the {nu} (CN) mode at 917 cm{sup -1}, the {nu}s(NO2) and {delta}s(CH3) modes near 1400 cm{sup -1} and the {nu}s(CH3) mode at 2968 cm{sup -1}. From the evolution of these modes we deduced that the excited state disappears with a lifetime of 1.1{+-}0.3 ps and we measured a photolysis quantum yield at 299 nm of 24%{+-}5%. Important and fast non-radiative desexcitation channel from excited to ground states has been observed.

• OSTI ID: 21163639
• Journal Information: AIP Conference Proceedings, Vol. 364, Issue 1; Conference: 54. international meeting of physical chemistry: Fast elementary processes in chemical and biological systems, Villeneuve d'Ascq (France), 26 Jun - 1 Jul 1995; Other Information: DOI: 10.1063/1.50152; (c) 1996 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CARBON NITRIDES
EXCITATION
EXCITED STATES
GROUND STATES
LIFETIME
LIQUIDS
NITROGEN DIOXIDE
NITROMETHANE
PHOTOLYSIS
PHOTON-MOLECULE COLLISIONS
PULSES
QUANTUM EFFICIENCY
RAMAN SPECTROSCOPY
TIME RESOLUTION
ULTRAVIOLET RADIATION