title: Two-dimensional time-frequency ultrafast infrared vibrational echo spectroscopy.
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.
authors.affiliation: Department of Chemistry, Stanford University, Stanford, California 94305, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Merchant
authors.forename: D E
authors.initials: DE
authors.lastname: Thompson
authors.forename: M D
authors.initials: MD
authors.lastname: Fayer
mesh_terms: D009942:Organometallic Compounds / Q000737:chemistry*; D012238:Rhodium; D012815:Signal Processing, Computer-Assisted; D013055:Spectrophotometry, Infrared / Q000379:methods*; D013816:Thermodynamics
chemical_list: D009942:Organometallic Compounds; C430324:(acetylacetonato)dicarbonylrhodium(I); D012238:Rhodium