Hannover 2016 – scientific programme
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MO: Fachverband Molekülphysik
MO 6: Posters 1: Novelties in Molecular Physics: Femtosecond Spectroscopy
MO 6.8: Poster
Monday, February 29, 2016, 16:30–19:00, Empore Lichthof
Femtosecond Photoelectron and Transient Grating Spectroscopy in the Extreme Ultraviolet Domain — Andrea Battistoni1, Jakob Grilj1,2, Markus Koch1,3, Emily F. Sistrunk1,4, Thomas J. A. Wolf1, and •Markus Gühr1,5 — 1PULSE, SLAC National Accelerator Laboratory and Stanford University, 94025 Menlo Park, CA, USA — 2EPFL, Lausanne, CH 1015, Switzerland — 3Experimental Physics, Graz University of Technology, A-8010 Graz, Austria — 4Lawrence Livermore National Laboratory, Livermore, CA 94550, USA — 5Physik und Astronomie, Universität Potsdam, 14476 Potsdam, Germany
We present ultrafast photoelectron [1] and transient grating spectroscopy [2] using extreme ultraviolet (EUV) pulses from a laser source based on high harmonic generation. For the molecular photoelectron spectroscopy, we compare one-photon to multi-photon probing demonstrating the importance of intermediate resonances in the transient decay [3].
For the transient gratings, we show how broadband EUV continua allow us to distinguish acoustic and electronic effects in a solid VO2 sample with a light induced insulator-to-metal transition. Permanent gratings, matched to the period of the transient, facilitate heterodyne detection of the (weak) nonlinear response of VO2 [4].
[1] M. Koch et al., J. Photoelectr. Spectr. Rel. Phen. 197, 22 (2014)
[2] E. Sistrunk et al., Optics Express 24, 4340 (2015)
[3] M. Koch et al., Phys. Rev. A 91, 031403 (2015)
[4] J. Grilj et al., Photonics 2, 392 (2015)