Atmospheric detection of water dimers via near-infrared absorption

被引：144

作者：

Pfeilsticker, K ^{[1
]}

Lotter, A ^{[1
]}

Peters, C ^{[1
]}

Bösch, H ^{[1
]}

机构：

[1] Heidelberg Univ, Inst Umweltphys, INF 229, D-69120 Heidelberg, Germany

来源：

SCIENCE | 2003年 / 300卷 / 5628期

关键词：

D O I：

10.1126/science.1082282

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Weakly bonded pairs of water molecules (H2O)(2), or water dimers (WDs), may play an important role in photochemistry and climate, but the overlap of most of its spectral features with the water monomer (WM) has made detection difficult. We report on WD absorption measurements by means of atmospheric long-path (18.34 kilometers) differential optical absorption spectroscopy of the near-infrared OH stretching mode 10>(f)\4>(b) overtone transition predicted to be located near 746 nanometers. Our observation is in reasonable agreement with the known thermochemistry, calculated and measured structure, and spectroscopy ( band strength, shape, and width) of the WD. The observation implies that the WD \0 >(f)\4>(b) band is located at 749.5 nanometers, with a full width at half maximum of similar to19.4 wave numbers, and that its band strength ranges between 1.23 x 10(-22) and 5.25 x 10(-22) centimeters per molecule.

引用

页码：2078 / 2080

页数：3

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