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Phys Rev Lett. 2001 Apr 23;86(17):3899-902.

Two-dimensional time-frequency ultrafast infrared vibrational echo spectroscopy.

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1
Department of Chemistry, Stanford University, Stanford, California 94305, USA.

Abstract

2D spectrally resolved ultrafast (<200 fs) IR vibrational echo experiments were performed on Rh(CO)(2)acac [(acetylacetonato)dicarbonylrhodium (I)]. The 2D spectra display features that reflect the 0-1 and 1-2 transitions and the combination band transition of the symmetric (S) and antisymmetric (A) CO stretching modes. Three oscillations in the data arise from the frequency difference between the S and A modes (quantum beats) and the S and A anharmonicities. A new explanation is given for these "anharmonic" oscillations. Calculations show that spectral resolution enables the 0-1 and 1-2 dephasing to be measured independently.

PMID:
11329352
DOI:
10.1103/PhysRevLett.86.3899
[Indexed for MEDLINE]
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