Ammonia-water complexes on the surface of aqueous solutions observed with sum frequency generation

被引：39

作者：

Simonelli, D

Baldelli, S

Shultz, MJ ^{[1
]}

机构：

[1] Tufts Univ, Dept Chem, Medford, MA 02155 USA

[2] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

来源：

CHEMICAL PHYSICS LETTERS | 1998年 / 298卷 / 4-6期

关键词：

D O I：

10.1016/S0009-2614(98)01238-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Sum frequency generation (SFG) is used to obtain the vibrational spectrum of aqueous ammonia solution. The SF spectrum of concentrated solutions is dominated by the N-H symmetric stretch (nu(1)) at 3312 cm(-1) and a weaker deformation mode (2 nu(4)) at 3200 cm(-1). The free OH peak of water is suppressed, compared to pure water, and the hydrogen-bonded region (3000-3450 cm(-1)) has interference in the presence of ammonia molecules at the interface. In dilute solution, nu(1) is less intense and the free OH peak of water appears. These observations confirm the existence of an ammonia-water complex at the Liquid/vapor interface. (C) 1998 Elsevier Science B.V. All rights reserved.

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页码：400 / 404

页数：5

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