Temperature dependence of solute vibrational relaxation in supercritical fluids: experiment and theory

Myers, DJ and Shigeiwa, Motoyuki and Stromberg, C and Fayer, MD and Cherayil, Binny J (2000) Temperature dependence of solute vibrational relaxation in supercritical fluids: experiment and theory. In: Chemical Physics Letters, 325 (5-6). pp. 619-626.

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Abstract

Vibrational lifetime (T-1) data for the asymmetric CO stretching mode of W(CO)(6) in supercritical ethane and carbon dioxide as a function of temperature at various fixed densities are compared to a recent extended hydrodynamic theory [1]. In ethane at the critical density, as the temperature is raised, T-1 initially becomes longer, reaching a maximum similar to 70 K above the critical temperature. T-1 decreases with further increase in temperature. The theory is able to reproduce this behavior nearly quantitatively without free parameters. At high density in ethane and in CO2, the inverted temperature dependence is not observed, in agreement with theoretical calculations.

Item Type:	Journal Article
Publication:	Chemical Physics Letters
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	19 Nov 2009 07:28
Last Modified:	19 Sep 2010 05:01
URI:	http://eprints.iisc.ac.in/id/eprint/18285

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