Direct observation of the photodecomposition of liquid nitromethane under UV photolysis by sub-picosecond time-resolved CARS experiments
Language
en
Article de revue
This item was published in
Chemical Physics Letters. 1994-12-30, vol. 231, n° 4-6, p. 467-475
Elsevier
English Abstract
Using a sub-picosecond CARS experiment we observed the direct photolysis of liquid nitromethane after pulse excitation at 299 nm. We measured the dynamical behaviour under excitation of three main ground-state Raman lines: ...Read more >
Using a sub-picosecond CARS experiment we observed the direct photolysis of liquid nitromethane after pulse excitation at 299 nm. We measured the dynamical behaviour under excitation of three main ground-state Raman lines: the v(CN) mode at 917 cm−1, the vs (NO2) and δs (CH3) modes near 1400 cm−1 and the Vs(CH3) mode at 2968 cm−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%. A non-radiative de-excitation channel from the excited to the ground state has been observed and its possible role in the explosive process is discussed.Read less <
Origin
Hal imported