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Laser-induced control of (multichannel) intracluster reactions

AuthorsRubio, Angel ; Echenique, Pedro M.
Issue DateFeb-2004
CitationEuropean Physical Journal D 28(2): 193-198 (2004)
AbstractAn experimental and theoretical study on the excited Ba ⋯ FCH3(A) photodissociation yield as a function of the excitation laser fluence is reported. Experimentally, it was found that the two-photodissociation channel yields, i.e. the reactive BaF and non-reactive Ba* products, increased exhibiting a similar behaviour, as the laser fluence changed from 0.2 up to ca. 4 mJ/cm2. Beyond this value the BaF yield levels off and the Ba* decreases over the 4-7 mJ/cm2 range. The theoretical simulation of the excited state electron-ion dynamics within the time-dependent density functional theory revealed that the reactive channel dominated the photofragmentation dynamics as it occurs within a femtosecond time scale and became accelerated as the photodissociation laser fluence increased. By contrast, the non-reactive channel only manifested for low laser fluences at the nano/picosecond time regime resulted inactive as the laser fluence increased. A simple scheme to control the dynamics of the intracluster multichannel reaction is suggested in which the slowest the channel the easiest to close it as the excitation laser power increases.
Publisher version (URL)http://dx.doi.org/10.1140/epjd/e2003-00302-7
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