Das Sagnik, Ghosh Jayanta, Vasudevan Sudheendran, Ranecky Simon T, Rosen Tonio, Ladda Nicolas, Lee Han-Gyeol, Stehling Till-Jakob, Westmeier Fabian, Mikosch Jochen, Senftleben Arne, Baumert Thomas, Braun Hendrike
Universität Kassel, Institut für Physik, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
Elettra - Sincrotrone Trieste S.C.P.A., Strada Statale 14, 34149 Basovizza, Trieste, Italy.
Phys Chem Chem Phys. 2025 Apr 16;27(16):8043-8051. doi: 10.1039/d4cp04572f.
Circular dichroism (CD) in ion yield in the gas phase is a promising chiral recognition technique. Combining it with broadband ultrafast laser pulses allows us to examine the possibility of coherent control. We used shaped femtosecond laser pulses to control the CD in ion yield of 3-methylcyclopentanone observed from a 1 + 1 + 1 resonance-enhanced multiphoton ionisation around 309 nm. The duration of the pulses is increased their spectral width or a frequency chirp, and a pulse pair with adjustable delay is employed to study the effect on the CD in ion yield. Furthermore, we used strongly chirped pulses of different central wavelengths to control the observed anisotropy. A clear enhancement of the anisotropy can be achieved, and possible mechanisms are discussed.
