Open AccessPredissociation dynamics of the B state of CH_3I by femtosecond pump-probe technique
Author(s) -
Yanmei Wang,
Huan Shen,
Hua Lee,
Changjin Hu,
Bing Zhang
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.010506
Subject(s) - femtosecond , atomic physics , rydberg formula , rydberg state , spectroscopy , coupling (piping) , laser , absorption (acoustics) , physics , optics , materials science , ion , ionization , quantum mechanics , metallurgy
The laser induced predissociation dynamics of the B Rydberg state of CH(3)I following two-photon absorption of a pump pulse was studied with femtosecond pump-probe photoelectron imaging coupled with time-resolved mass spectroscopy. The predissociation lifetime was measured to be 1.55 ps induced by the crossing between the B state and the repulsive A-band. Two possible predissociation channels were observed originating from (a) direct coupling between the B state and the repulsive (3)Q(0) state and (b) a second crossing between the (3)Q(0) and (1)Q(1) states after the coupling between the B and (3)Q(0) states, respectively.