Energetics of hydrogen bond network rearrangements in liquid water

被引：485

作者：

Smith, JD ^{[1
]}

Cappa, CD ^{[1
]}

Wilson, KR ^{[1
]}

Messer, BM ^{[1
]}

Cohen, RC ^{[1
]}

Saykally, RJ ^{[1
]}

机构：

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

来源：

SCIENCE | 2004年 / 306卷 / 5697期

关键词：

D O I：

10.1126/science.1102560

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：

A strong temperature dependence of oxygen K-edge x-ray absorption fine structure features was observed for supercooled and normal liquid water droplets prepared from the breakup of a liquid microjet. Analysis of the data over the temperature range 251 to 288 kelvin (-22degrees to +15degreesC) yields a value of 1.5+/-0.5 kilocalories per mote for the average thermal energy required to effect an observable rearrangement between the fully coordinated ("ice-like") and distorted ("broken-donor") local hydrogen-bonding configurations responsible for the pre-edge and post-edge features, respectively. This energy equals the latent heat of melting of ice with hexagonal symmetry (ice 1=lh) and is consistent with the distribution of hydrogen bond strengths obtained for the "overstructured" ST2 model of water.

引用

页码：851 / 853

页数：3

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