Coherent vibrational climbing in carboxyhemoglobin.
Proc Natl Acad Sci U S A
; 101(36): 13216-20, 2004 Sep 07.
Article
en En
| MEDLINE
| ID: mdl-15319472
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 = 6 to 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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1
Bases de datos:
MEDLINE
Asunto principal:
Carboxihemoglobina
Idioma:
En
Revista:
Proc Natl Acad Sci U S A
Año:
2004
Tipo del documento:
Article
País de afiliación:
Francia