Transient Two-Dimensional Infrared Spectroscopy in a Vibrational Ladder

We report on transient 2D Fourier transform infrared spectroscopy (2DIR) after vibrational ladder climbing induced in the CO-moiety longitudinal stretch of carboxyhemoglobin. The population distribution, spreading up to seven vibrational levels, results in a nonequilibrium 2DIR spectrum evidencing a...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2016-09, Vol.7 (17), p.3377-3382
Main Authors: Kemlin, Vincent, Bonvalet, Adeline, Daniault, Louis, Joffre, Manuel
Format: Article
Language:English
Subjects:
Chemical Physics
Optics
Physics
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Summary:We report on transient 2D Fourier transform infrared spectroscopy (2DIR) after vibrational ladder climbing induced in the CO-moiety longitudinal stretch of carboxyhemoglobin. The population distribution, spreading up to seven vibrational levels, results in a nonequilibrium 2DIR spectrum evidencing a large number of peaks that can be easily attributed to individual transitions thanks to the anharmonicity of the vibrational potential. We discuss the physical origin of the observed peaks as well as the qualitative behavior of the subsequent dynamics governed by population relaxation in the vibrational ladder.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.6b01535