Pump-Probe spectroscopy with a femtosecond monochromatic VUV light source

POSTER

Abstract

A table-top pump-probe set-up combining our Vacuum Ultra-Violet (VUV) monochrometor and cold target recoil-ion momentum spectroscopy (COLTRIMS) apparatus has been developed. High flux VUV photons are generated from a semi-infinite gas cell via high order harmonic generation. A dispersion-compensated grating pair is used to select a single harmonic with pulse duration below a 100 femtosecond. The VUV photon energy is tunable from 10 to 20 eV with a bandwidth of less than 200 meV. Such a VUV source can strongly interact with valence electrons of most molecules, thus trigger chemical reactions with well-defined time-energy information. A following synchronous infrared pulse is applied to probe or control the process. The reaction products are momentum-imaged in coincidence by the COLTRIMS system, thus enabling channel-resolved measurements. A few proof-of-principal experiments on the simplest molecular system, D$_{\mathrm{2}}$, are demonstrated.

Authors

  • Wei Cao

    J.R. Macdonald Laboratory, Physics Dept, Kansas State University, Manhattan, KS, U.S.A., J.R. Macdonald Laboratory, Physics Dept, Kansas State University, Manhattan, KS, U.S.A

  • I. Ben-Itzhak

    J.R. Macdonald Laboratory, Physics Dept, Kansas State University, Manhattan, KS, U.S.A., J. R. Macdonald Laboratory, Department of Physics, Kansas State University, J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS, USA, J.R. Macdonald Laboratory, Physics Department, Kansas State University, Manhattan, KS 66506, USA, J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506 USA, J.R. Macdonald Laboratory, Physics Dept, Kansas State University, Manhattan, KS, U.S.A, J. R. Macdonald Laboratory, Physics Dept., Kansas State University, Manhattan, KS, USA, J. R. Macdonald Laboratory, Physics Department, Kansas State University, Manhattan, KS 66506, USA

  • Charles Lewis Cocke

    J.R. Macdonald Laboratory, Physics Dept, Kansas State University, Manhattan, KS, U.S.A., J.R. Macdonald Laboratory, Physics Dept, Kansas State University, Manhattan, KS, U.S.A