Spectroscopy and dynamics of the Ba center dot center dot FCH3 complex excited in the 728-760 nm wavelength region

摘要

The laser-induced intracluster Ba center dot center dot FCH3+ h nu --> Ba* + CH3F photofragmentation has been investigated in the 13158 - 13736 cm(-1) energy range, corresponding to the electronic (A) over tilde'-state of the Ba center dot center dot FCH3 molecule. The major photofragmentation path was found to be the non-reactive Ba* + CH3F channel. The photodepletion action spectrum of the Ba center dot center dot FCH3 was measured using nanosecond pump and probe technique, showing a broad feature with a maximum photodepletion cross-section of 8 angstrom(2). The action spectrum of the non-reactive Ba photofragmentation channel was also measured. The results are discussed in the light of a proposed mechanism for the harpooning reaction leading to BaF when the complex is excited to the (A) over tilde electronic state.