Femtosecond photoelectron diffraction on laser-aligned molecules: Towards time-resolved imaging of molecular structure
- Boll, Rebecca
- Anielski, D.
- Foucar, L.
- Krasniqi, F.
- Küpper, J.
- Rouzée, A.
- Rudek, B.
- Rudenko, A.
- Schorb, S.
- Stapelfeldt, H.
- Stener, M.
- Stern, S.
- Bostedt, C.
- Techert, S.
- Trippel, S.
- Vrakking, M.
- Ullrich, J.
- Rolles, D.
- Bozek, J.
- Christensen, L.
- Coffee, R.
- De, S.
- Decleva, P.
- Epp, S.
- Erk, B.
DOIAbstract
We demonstrate an experimental method to record snapshot diffraction images of polyatomic gas-phase molecules, which can, in a next step, be used to probe time-dependent changes in the molecular geometry during photochemical reactions with femtosecond temporal and angstrom spatial resolution. Adiabatically laser-aligned 1-ethynyl-4-fluorobenzene (C8H5F) molecules were imaged by diffraction of photoelectrons with kinetic energies between 31 and 62 eV, created from core ionization of the fluorine (1s) level by ≈80 fs x-ray free-electron-laser pulses. Comparison of the experimental photoelectron angular distributions with density functional theory calculations allows relating the diffraction images to the molecular structure
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