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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 DomainAndrea Battistoni1, Jakob Grilj1,2, Markus Koch1,3, Emily F. Sistrunk1,4, Thomas J. A. Wolf1, and •Markus Gühr1,51PULSE, 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)

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