On the nature of OH-stretching vibrations in hydrogen-bonded chains: pump frequency dependent vibrational lifetime
Publication year
2011Source
PCCP Physical Chemistry Chemical Physics, 13, 10, (2011), pp. 4641-50ISSN
Publication type
Article / Letter to editor

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Organization
Rheumatology
Journal title
PCCP Physical Chemistry Chemical Physics
Volume
vol. 13
Issue
iss. 10
Page start
p. 4641
Page end
p. 50
Subject
NCEBP 2: Evaluation of complex medical interventions N4i 4: Auto-immunity, transplantation and immunotherapyAbstract
Two-dimensional infrared spectroscopy was carried out on stereoselectively synthesized polyalcohols. Depending upon the stereochemical orientation of their hydroxyl groups, the polyols can either feature linear chains of hydrogen bonds that are stable for extended periods of time or they can display ultrafast dynamics of hydrogen-bond breakage and formation. In the former case, the OH-stretching vibrations and their transition dipoles are substantially coupled, hence prior to vibrational relaxation, the initial OH-stretching excitation is rapidly redistributed among the set of hydroxyl-groups constituting the hydrogen-bonded chain. This redistribution is responsible for an ultrafast loss of memory regarding the frequency of initial excitation and as a result, a pump-frequency independent vibrational lifetime is observed. In contrast, in the latter case, the coupling of the OH-groups and their transition dipoles is much weaker. Therefore, the OH-stretching excitation remains localized on the initially excited oscillator for the time scale of vibrational energy relaxation. As a result inhomogeneous relaxation dynamics with a pump-frequency-dependent lifetime are observed.
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- Academic publications [227942]
- Faculty of Medical Sciences [86237]
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