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A femtosecond velocity map imaging study on B -band predissociation in CH3 I. I. the band origin

AuthorsGitzinger, G. ; Corrales, M.E.; Loriot, V. ; Amaral, G.A.; de Nalda, R. ; Bañares, L.
Issue Date18-Jun-2010
PublisherAmerican Institute of Physics
CitationJournal of Chemical Physics 132: 234313 (2010)
AbstractA femtosecond pump-probe experiment, coupled with velocity map ion imaging, is reported on the second absorption band (B -band) of CH3 I. The measurements provide a detailed picture of real-time B -band predissociation in the band origin at 201.2 nm. Several new data are reported. (i) A value of 1.5±0.1 ps has been obtained for the lifetime of the excited state, consistent within errors with the only other direct measurement of this quantity [A. P. Baronavski and J. C. Owrutsky, J. Chem. Phys. 108, 3445 (1998)]. (ii) It has been possible to measure the angular character of the transition directly through the observation of fragments appearing early with respect to both predissociation lifetime and molecular rotation. (iii) Vibrational activity in CH3 has been found, both in the umbrella (2) and the symmetric stretch (1) modes, with estimates of relative populations. All these findings constitute a challenge and a test for much-wanted high level ab initio and dynamics calculations in this energy region. © 2010 American Institute of Physics.
Description7 p.; 5 fig.; 1 tab.
Publisher version (URL)http://dx.doi.org/10.1063/1.3455207
Identifiersdoi: 10.1063/1.3455207
issn: 0021-9606
Appears in Collections:(IQFR) Artículos
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