title: Coherent dynamics of the localized vibrational modes of hydrogen in CaF2
abstract: We report the observation of giant quantum coherence effects in the localized modes of ionized hydrogen in synthetic fluorite. Infrared free induction decay experiments on the substitutional H- center show dramatic modulations at negative delay times due to interference between multiple vibrational levels. Spectrally resolving the degenerate four wave mixing signal allows unambiguous assignments of the participating vibrational states. The dependence of the signal intensity upon the delay path between the exciting free electron laser pulses can be accounted for in terms of the resonant third order polarization with a common dephasing time for the excited states.
authors.affiliation: Department of Physics, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom and FELIX Free Electron Laser Facility, FOM-Institute for Plasmaphysics "Rijnhuizen," P.O. Box 1207, 3430 Be Nieuwegein, The Netherlands.
authors.initials: JP
authors.lastname: Wells
authors.initials: CW
authors.lastname: Rella
authors.initials: IV
authors.lastname: Bradley
authors.initials: I
authors.lastname: Galbraith
authors.initials: CR
authors.lastname: Pidgeon