Study of femtosecond dynamics in vibrationally excited free bis(trifluoromethyl)ketene and metal carbonyl molecules induced by CO bond resonant excitation

The dynamics of relaxation processes in free bis(trifluoromethyl)ketene (CF 3 ) 2 CCO and Fe(CO) 5 and Cr(CO) 6 metal carbonyl molecules after multiphonon excitation of the C=C=O and C=O vibrations by femtosecond laser infrared radiation was studied. The temporal and spectral dependences of the rela...

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Bibliographic Details
Published in:Bulletin of the Russian Academy of Sciences. Physics 2011-02, Vol.75 (2), p.145-149
Main Authors: Kompanets, V. O., Laptev, V. B., Makarov, A. A., Pigulsky, S. V., Ryabov, E. A., Chekalin, S. V.
Format: Article
Language:English
Subjects:
Carbonyls
Chromium
Cobalt
Excitation spectra
Femtosecond pulsed lasers
Hadrons
Heavy Ions
Infrared lasers
Infrared radiation
Iron
Nuclear Physics
Physics
Physics and Astronomy
Proceedings of the IX International Symposium on Photon Echoes and Coherent Spectroscopy
Vibrational states
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Summary:The dynamics of relaxation processes in free bis(trifluoromethyl)ketene (CF 3 ) 2 CCO and Fe(CO) 5 and Cr(CO) 6 metal carbonyl molecules after multiphonon excitation of the C=C=O and C=O vibrations by femtosecond laser infrared radiation was studied. The temporal and spectral dependences of the relaxation of the excited vibrational states were measured. Kinetics with a characteristic decay time of about 5 ps was obtained for (CF 3 ) 2 CCO molecules. Its behavior is interpreted as a manifestation of the intramolecular relaxation of the excited vibration states of the resonance mode. Kinetic curves with characteristic times of about 250–500 fs were observed for Fe(CO) 5 and Cr(CO) 6 . The behavior of these curves depends on the mutual orientation of the polarizations of the pump and probe pulses.
ISSN:1062-8738
1934-9432
DOI:10.3103/S1062873811020195