2026-06-08T08:28:54Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/944182025-03-18T12:04:10Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Corrales Castellanos, Maria Eugenia author Shternin, Peter author Rubio Lago, Luis author Nalda, Rebeca de author Vasyutinskii, Oleg author Bañares Morcillo, Luis author 2016 This Letter presents an experimental and theoretical study of femtosecond time-resolved vector correlations in methyl iodide (CH3I) electronic predissociation via the second absorption B-band at 201.2 nm. The time evolution of the phenomenological anisotropy parameters βl was determined from time-resolved photofragment angular distributions obtained by means of the femtosecond laser pump–probe technique coupled with velocity map imaging detection of vibrational ground-state CH3(ν = 0) fragments and spin–orbit excited I*(2P1/2) atoms. Theoretical interpretation of the experimental results was performed on the basis of a fitting procedure using quasiclassical theory, which elucidates vector correlations in photodissociation of symmetric top molecules. The results of the fitting are in very good agreement with the experimental data and demonstrate the important role of molecular excited-state lifetimes, parent molecule and methyl fragment rotations, and methyl fragment angular momentum alignment on the time-dependent electronic predissociation dynamics. M. E. Corrales, P. S. Shternin, L. Rubio-Lago, R. de Nalda, O. S. Vasyutinskii, and L. Bañares The Journal of Physical Chemistry Letters 2016 7 (22), 4458-4463 DOI: 10.1021/acs.jpclett.6b01874 1948-7185 10.1021/acs.jpclett.6b01874 https://hdl.handle.net/20.500.14352/94418 https://doi.org/10.1021/acs.jpclett.6b01874 Femtosecond Time-Resolved Photofragment Rotational Angular Momentum Alignment in Electronic Predissociation Dynamics