Abstract.
An experimental and theoretical study on the excited Ba\(\cdots\)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.
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Received: 3 July 2003
PACS:
36.40.Jn Reactivity of clusters - 36.40.Qv Stability and fragmentation of clusters - 34.50.Rk Laser-modified scattering and reactions
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González Ureña, A., Gasmi, K., Skowronek, S. et al. Laser-induced control of (multichannel) intracluster reactions. Eur. Phys. J. D 28, 193–198 (2004). https://doi.org/10.1140/epjd/e2003-00302-7
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DOI: https://doi.org/10.1140/epjd/e2003-00302-7