Barium Ions and Helium Nanodroplets: Solvation and Desolvation

The solvation of Ba+ ions created by the photoionization of barium atoms located on the surface of helium nanodroplets has been investigated. The excitation spectra corresponding to the 6p <sup>2</sup>P<sub>1/2</sub> <-- 6s <sup>2</sup>S<sub>1/2</sub> and 6p <sup>2</sup>P<sub>3/2</sub> <-- 6s <sup>2</sup>S<sub>1/2</sub> transitions of Ba<sup>+</sup> are found to be identical to those recorded in bulk He II [Phys. Lett. A 115, 238 (1986)], indicating that the ions formed at the surface of the helium droplets become fully solvated by the helium. Time-of flight mass spectra suggest that following the excitation of the solvated Ba<sup>+</sup> ions, these are being ejected from the helium droplets either as bare Ba<sup>+</sup> ions or as small Ba<sup>+</sup>He<sub>n</sub> (n<20) complexes.


Published in:
Journal of Chemical Physics, 137, 051102
Year:
2012
Publisher:
Melville, American Institute of Physics
ISSN:
0021-9606
Keywords:
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 Record created 2012-07-23, last modified 2018-03-17

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