Sum frequency generation by water on supercooled H2SO4/H2O liquid solutions at stratospheric temperature

被引：47

作者：

Schnitzer, C

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 | 1999年 / 313卷 / 3-4期

关键词：

D O I：

10.1016/S0009-2614(99)01087-8

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 spectra indicate that the surface water of liquid sulfuric acid solutions varies as a function of concentration, but not with temperature. At 0.1 x H2SO4 (where x = mole fraction, 38 wt%), subsurface ionic species orient surface water molecules. The surface of 0.2 x H2SO4 (58 wt%) solutions, however, features H2SO4/H2O complexes both at 273 K and supercooled at 216 K. The results support a picture of stratospheric chemistry in which sulfuric acid aerosols are coated with hydrogen-bonded water/sulfuric acid complexes. (C) 1999 Elsevier Science B.V. All rights reserved.

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页码：416 / 420

页数：5

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