Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
89 (1988), S. 605-606
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The infrared spectra of mass-selected cesium cations solvated by 4–16 methanol molecules have been obtained from vibrational predissociation spectroscopy. The solvated ions were prepared in a molecular beam apparatus equipped with a quadrupole mass spectrometer. A cw CO2 laser operating in the 9.6 μ region was used to excite the methanol C–O stretch in the solvated ions. Depletion of the mass-selected solvated ion signal due to vibrational predissociation was used to generate the infrared absorption spectra. This work represents the first infrared study of metal ion–solvent clusters. The spectra display a clear variation with the number of solvents throughout the range of 4–16. A single peak at ∼1031 cm−1 steadily grew in intensity from four to ten methanol molecules. The presence of additional methanol molecules beyond ten did not affect the intensity of the 1030 cm−1 peak, but a new spectral feature became observable to higher frequency. The spectroscopic data are consistent with a first solvation shell size of ten methanol molecules. This is the first direct experimental observation of a filled solvent shell associated with the cesium cation. The C–O stretching frequencies of the methanol molecules are compared with existing experimental results involving neutral clusters.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.455452
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