通讯：钡离子和氦纳米液滴：溶剂化和去溶剂化。

Communication: Barium ions and helium nanodroplets: solvation and desolvation.

机构信息

Laboratoire de Chimie Physique Moléculaire, Swiss Federal Institute of Technology Lausanne, CH-1015 Lausanne, Switzerland.

出版信息

J Chem Phys. 2012 Aug 7;137(5):051102. doi: 10.1063/1.4743900.

DOI:10.1063/1.4743900

PMID:22894324

Abstract

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 (2)P(1/2) ← 6s (2)S(1/2) and 6p (2)P(3/2) ← 6s (2)S(1/2) transitions of Ba(+) are found to be identical to those recorded in bulk He II [H. J. Reyher, H. Bauer, C. Huber, R. Mayer, A. Schafer, and A. Winnacker, 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(+) ions, these are being ejected from the helium droplets either as bare Ba(+) ions or as small Ba(+)He(n) (n < 20) complexes.

摘要

已研究了位于氦纳米液滴表面的钡原子光电离产生的 Ba(+)离子的溶剂化。发现与在 He II 中记录的 [H. J. Reyher, H. Bauer, C. Huber, R. Mayer, A. Schafer, and A. Winnacker, Phys. Lett. A 115, 238 (1986)] 相同的激发光谱对应于 Ba(+)的 6p (2)P(1/2) ← 6s (2)S(1/2) 和 6p (2)P(3/2) ← 6s (2)S(1/2) 跃迁，表明在氦液滴表面形成的离子被氦完全溶剂化。飞行时间质谱表明，在溶剂化的 Ba(+)离子被激发后，这些离子要么作为裸 Ba(+)离子，要么作为小的 Ba(+)He(n)（n < 20）复合物从氦液滴中被喷射出来。