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MO: Fachverband Molekülphysik

MO 3: Chiral Molecules

MO 3.9: Vortrag

Montag, 9. März 2020, 16:15–16:30, f102

Controlling and optimising the circular dichroism in the ion yield of chiral molecules using ultrashort laser pulses in the IR, visible and UV — •Hendrike Braun, Tom Ring, Constantin Witte, Nicolas Ladda, Cristian Sarpe, Simon Ranecky, Sudheendran Vasudevan, Han-gyeol Lee, Arne Senftleben, and Thomas Baumert — Universität Kassel, Institut für Physik, Heinrich-Plett-Str. 40, 34132 Kassel, Germany

Circular dichroism, the difference of a system's response to interaction with left and right circularly polarized light, shows up in the absorption spectra of chiral molecules or in the polarization of transmitted light. CD was recently also observed in the ion yield of chiral molecules after REMPI (resonance enhanced multiphoton ionisation) experiments employing nano- and femtosecond laser pulses. The effect in the total ion yield is often related to the CD in absorption of the resonant intermediate. Using ultrashort laser pulses of different wavelengths, we can access the intermediate states of chiral molecules with different photonicities, ranging from multiphoton absorption for 800 nm pulses to one-photon absorption for 324 nm or 266 nm pulses. In combination with spectral phase shaping we are investigating the possibilities to control and optimise the measured CD value in the ion yield. Especially non-perturbative light matter interaction control schemes like Rabi oscillations and RAP are of interest as well as the potential use of composite pulses, that are currently also under review from theoretical side.