Vibrational predissociation spectroscopy of the (H2O)6−⋅Arn, n⩾6, clusters
Vibrational predissociation spectroscopy of the (H2O)6−⋅Arn, n⩾6, clusters
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(H2O)6−⋅Arn, n⩾6, 团簇的振动预解离光谱
DOI：
10.1063/1.475406
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发表时间：
1998
影响因子：
4.4
通讯作者：
Marvin Johnson
中科院分区：
文献类型：
--
作者：
P. Ayotte;C. Bailey;Jun Kim;Marvin Johnson
（H2O）6−与几个氩原子的溶剂化抑制了裸露的六聚体阴离子中强烈的直接光剥离背景，允许在无背景制度下进行振动预解离光谱。除了先前报道的自动分离共振[C. G. Bailey，J. Kim，and M. A.约翰逊，物理化学杂志100，16782（1996）]中，预解离光谱显示出许多弱谱带分散在整个中红外（3200-3750 cm-1）。大多数这些新的频带是明显的裸露的六聚体光谱信号平均后，表明它们被隔离使用predissociation，但不诱导溶剂化。最强的谱带显示出比中性水团簇的矩阵位移强得多的红移（>30 cm−1，n=15），表明这些谱带是负离子所特有的。
Solvation of (H2O)6− with several argon atoms suppresses the strong direct photodetachment background in the bare hexamer anion, allowing vibrational predissociation spectroscopy to be carried out in a background-free regime. In addition to the previously reported autodetaching resonances [C. G. Bailey, J. Kim, and M. A. Johnson, J. Phys. Chem. 100, 16782 (1996)] in the single donor hydrogen bonding region (∼3300 cm−1), the predissociation spectra reveal many weak bands scattered throughout the mid infrared (3200–3750 cm−1). Most of these new bands are evident in the bare hexamer spectrum after signal averaging, indicating that they are isolated using predissociation but not induced by solvation. The most intense bands display much stronger redshifts (>30 cm−1 by n=15) than the matrix shifts typically found for the neutral water clusters, indicating that these bands are unique to the negative ion.