頁籤選單縮合
| 題 名 | Femtosecond Dynamics of Hydrogen Bonds in Liquid Water: A Real Time Study |
|---|---|
| 作 者 | Lascoux,Noelle; Gallot,Guilhem; Hache,Francois; Gale,Geoffrey Mitchell; Bratos,Savo; Leicknam,Jean-claude; | 書刊名 | Journal of the Chinese Chemical Society |
| 卷 期 | 47:4A 民89.08 |
| 頁 次 | 頁685-692 |
| 分類號 | 345.1 |
| 關鍵詞 | Hydrogen bond dynamics; Hole burning spectroscopy; Spectral diffussion; Energetic relaxation; |
| 語 文 | 英文(English) |
| 英文摘要 | An experiment is described to study temporal variations of the hydrogen bond length in diluted HDO/D �� O solutions. The principles of this laser spectroscopic experiment are explained first. The construction of a laser source generating 150 fs pulses in the 2.5-4.5 um spectral region at a 10 uJ power level is detailed next. The OH stretching band is reproduced for different excitation frequencies and different pump-probe delay times. A theory, based on statistical mechanics of nonlinear optical processes, is proposed to calculate the lowest two spectral moments. A new effect is reported, the delay dependent vibrational solvatochromism. It is shown how this effect can be exploited to follow temporal variations of the OH..O bond length directly, in real time. Initially elongated hydrogen bonds were found to contract with time and to reach the equilibrium lengths. The corresponding times scales are of the order of 700 fs. No bond oscillations are observed. |
本系統中英文摘要資訊取自各篇刊載內容。