Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 31: Strong laser fields - II

A 31.3: Vortrag

Mittwoch, 7. März 2018, 14:45–15:00, K 2.019

Towards phase-of-the-phase spectroscopy on atomic hydrogen — •Bennet Krebs, Dzmitry Komar, Konstantin Gröner, Michael Zabel, Lev Kazak, Josef Tiggesbäumker, and Karl-Heinz Meiwes-Broer — Universitaet Rostock, Institut fuer Physik, Albert-Einstein-Str. 24, D-18059 Rostock

A hot capillary thermal atomic hydrogen source is used in order to extract angular resolved photoelectron signal from H₁. Near infrared laser light (λ=800 nm, τ=130 fs, I_f≈ 10¹⁴ W/cm²) is used to ionize hydrogen in the tunneling regime. A serious problem with respect to strong field photoemission from atomic hydrogen is the background signal caused by the low efficiency in standard H₁-sources. Directional focused H₁ sources interact with the perpendicular aligned laser-field only within their cross section, while residual or recombined H₂ may be ionized over the whole laser volume. At high gas loads the H₂ signal may be orders of magnitude higher than the desired atomic signal. VMI spectra of H₁ are presented and compared to spectra of molecular hydrogen. By expanding the laser setup to ω/2ω fields we plan conduct PoP Spectroscopy [1] on the simplest atomic system in order to contribute benchmark data for theory.

[1] S. Skruszewicz, et al. Phys. Rev. Lett. 115, 043001 (2015)