title: Coherent infrared multidimensional spectra of the OH stretching band in liquid water simulated by direct nonlinear exciton propagation.
abstract: The two-dimensional vibrational response of the disordered strongly fluctuating OH exciton band in liquid water is investigated using a new simulation protocol. The direct nonlinear exciton propagation generalizes the nonlinear exciton equations to include nonadiabatic time dependent Hamiltonian and transition dipole fluctuations. The excitonic picture is retained and the large cancellation between Liouville pathways is built-in from the outset. The sensitivity of the photon echo and double-quantum-coherence techniques to frequency fluctuations, molecular reorientation, intermolecular coupling, and the two-exciton coherence is investigated. The photon echo is particularly sensitive to the frequency fluctuations and molecular reorientation, whereas the double-quantum coherence provides a unique probe for intermolecular couplings and two-exciton coherence.
authors.affiliation: Department of Chemistry, University of California, Irvine, California 92697, USA.
authors.forename: Cyril
authors.initials: C
authors.lastname: Falvo
authors.forename: Benoit
authors.initials: B
authors.lastname: Palmieri
authors.forename: Shaul
authors.initials: S
authors.lastname: Mukamel
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D008958:Models, Molecular; D013055:Spectrophotometry, Infrared / Q000379:methods; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water