Orientation and Motion of Water Molecules at Air/Water Interface

这里，我们在空气 / 水接口报导 orientational 结构的量的研究和水分子的运动。和频率产生(SFG ) 的分析震动的山峰免费哦在四种试验性的配置在 3700 厘米 1 拉长乐队在空气 / 水显示出水分子的那个 orientational 运动接口在一个有限尖范围以内是摆动的。免费哦界面的水分子的债券在 33 附近被倾斜??啓???￣??啓??????????啓?￣橩?匯?????????瘠?啓??匯??瘠?啓??匯??瘠?啓??匯????匼???啓?????牡楬杮?湥楮潳??柳？？

Here we report a quantitative study of the orientational structure and motion of water molecule at the air/water interface. Analysis of Sum Frequency Generation （SFG） vibrational peak of the free O-H stretching band at 3700 cm^-1 in four experimental configurations showed that orientational motion of water molecule at air/water interface is libratory within a limited angular range. The free OH bond of the interracial water molecule is tilted around 33°from the interface normal and the orientational distribution or motion width is less than 15°. This picture is significantly different from the previous conclusion that the interracial water molecule orientation varies over a broad range within the ultrafast vibrational relaxation time, the only direct experimental study concluded for ultrafast and broad orient, ational motion of a liquid interface by Wei et al. （Phys. Rev. Lett. 86, 4799, （2001）） using single SFG experimental configuration.