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Coherent vibrational climbing in carboxyhemoglobin

Abstract : We demonstrate vibrational climbing in the CO stretch of carboxyhemoglobin pumped by midinfrared chirped ultrashort pulses. By use of spectrally resolved pump-probe measurements, we directly observed the induced absorption lines caused by excited vibrational populations up to v = 6. In some cases, we also observed stimulated emission, providing direct evidence of vibrational population inversion. This study provides important spectroscopic parameters on the CO stretch in the strong-field regime, such as transition frequencies and dephasing times up to the v = 6to v = 7 vibrational transition. We measured equally spaced vibrational transitions, in agreement with the energy levels of a Morse potential up to v = 6. It is interesting that the integral of the differential absorption spectra was observed to deviate far from zero, in contrast to what one would expect from a simple one-dimensional Morse model assuming a linear dependence of dipole moment with bond length.
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Contributor : Laure Lachapelle <>
Submitted on : Thursday, September 25, 2008 - 10:08:16 AM
Last modification on : Tuesday, January 5, 2021 - 10:54:01 AM

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Cathie Ventalon, James Fraser, Marten Vos, Antigoni Alexandrou, Jean-Louis Martin, et al.. Coherent vibrational climbing in carboxyhemoglobin. Proceedings of the National Academy of Sciences of the United States of America , National Academy of Sciences, 2004, 101 (36), pp.13216-13220. ⟨10.1073/pnas.0401844101⟩. ⟨hal-00324462⟩



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