Orientational relaxation of liquid water molecules as an activated process

Autor:	Han-Kwang Nienhuys, Huib J. Bakker, Rutger A. van Santen
Přispěvatelé:	Chemical Engineering and Chemistry, Inorganic Materials & Catalysis
Rok vydání:	2000
Předmět:	Chemistry Relaxation (NMR) Analytical chemistry General Physics and Astronomy Infrared spectroscopy Activation energy Chemical physics Molecular vibration Physics::Chemical Physics Physical and Theoretical Chemistry Diffusion (business) Spectroscopy Anisotropy Excitation
Zdroj:	Journal of Chemical Physics, 112(9), 8487-8494. American Chemical Society
ISSN:	1089-7690 0021-9606
Popis:	Femtosecond mid-infrared pump-probe spectroscopy is used to study the orientational relaxation of HDO molecules dissolved in liquid D2O. In this technique, the excitation of the O-H stretch vibration is used as a label in order to follow the orientational motion of the HDO molecules. The decay of the anisotropy is nonexponential with a typical time scale of 1 ps and can be described with a model in which the reorientation time depends on frequency and in which the previously observed spectral diffusion is incorporated. From the frequency and temperature dependence of the anisotropy decay, the activation energy for reorientation can be derived. This activation energy is found to increase with increasing hydrogen bond strength. (C) 2000 American Institute of Physics. [S0021-9606(00)52019- 4]
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::29530f3bbe9550cb16bf15bfa0fb9dd2 https://doi.org/10.1063/1.481451 Zobrazit plný text záznamu