Abstract
We have studied the dissociation dynamics of Mg2CH4+ ion–molecule clusters through mass-resolved photodissociation spectroscopy, coupled with translational energy spectroscopy. We have observed distinct molecular absorption bands in the red (690–615 nm) and green (580–545 nm) spectral regions. Mg+ is the dominant fragmentation product in each band. We observe a significant energy release into relative translation and a pronounced photofragment anisotropy (β>0), consistent with a rapid dissociation. Based on the observed anisotropy and the result of an ab initio structure calculation, we assign the red band to the parallel transition 2 2A′←1 2A′ and the green band to a combination of 1 2A′′←1 2A′ and 3 2A′←1 2A′ transitions, all in Cs symmetry. These results are compared with earlier results from the photodissociation spectroscopy of the more strongly bound Mg2CO2+ and Mg2H2O+ bimolecular complexes.
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