Mainz 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

A: Fachverband Atomphysik

A 6: Time-resolved spectroscopy

A 6.6: Vortrag

Montag, 6. März 2017, 18:45–19:00, HS 20

Time-Dependent Strong-Field Effects in Argon and Nitrogen — •Paul Birk, Veit Stooß, Maximilian Hartmann, Alexander Blättermann, Kristina Meyer, Christan Ott, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Extreme ultraviolet (XUV) light pulses in the attosecond regime produced by high-harmonic generation of near-infrared (NIR) light are powerful tools to investigate intra-atomic and -molecular processes at ultra-high time resolution. With the help of an all-optical approach we gain access to bound-state dynamics and correlations between electronic states in atoms and molecules. In previous work we have investigated the laser-induced phase shifts and couplings of excited states in helium by measuring its perturbed polarization decay [1-2]. Based on this work on a two-electron system, we here study and compare time-dependent strong-field effects in argon and molecular nitrogen. Electronic and vibrational states of the target gases are excited by a weak XUV pulse and subsequently perturbed with a strong NIR pulse. We present first results and interpretations of XUV absorption spectra and their changes depending on both the time delay and intensity of the strong NIR pulse.
Blättermann et. al., J. Phys. B, 47, 124008 (2014)
Blättermann et. al., Optics Letters, 40, 3464 (2015)