title: Broadband infrared and Raman probes of excited-state vibrational molecular dynamics: simulation protocols based on loop diagrams.
abstract: Vibrational motions in electronically excited states can be observed either by time and frequency resolved infrared absorption or by off resonant stimulated Raman techniques. Multipoint correlation function expressions are derived for both signals. Three representations which suggest different simulation protocols for the signals are developed. These are based on the forward and the backward propagation of the wavefunction, sum over state expansion using an effective vibrational Hamiltonian or a semiclassical treatment of a bath. We show that the effective temporal (Δt) and spectral (Δω) resolution of the techniques is not controlled solely by experimental knobs but also depends on the system dynamics being probed. The Fourier uncertainty ΔωΔt > 1 is never violated.
authors.affiliation: Department of Chemistry, University of California, Irvine, California 92697-2025, USA. kdorfman@uci.edu
authors.forename: Konstantin E
authors.initials: KE
authors.lastname: Dorfman
authors.forename: Benjamin P
authors.initials: BP
authors.lastname: Fingerhut
authors.forename: Shaul
authors.initials: S
authors.lastname: Mukamel
mesh_terms: D000465:Algorithms; D004583:Electrons; D056004:Molecular Dynamics Simulation; D015335:Molecular Probes / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D014732:Vibration
chemical_list: D015335:Molecular Probes