Berlin 2014 – scientific programme

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MO: Fachverband Molekülphysik

MO 23: Femtosecond Spectroscopy 3

MO 23.3: Talk

Friday, March 21, 2014, 14:30–14:45, BEBEL HS213

Selective excitation of electronic states in K₂ — •Hendrike Braun¹, Dominik Pengel², Cristian Sarpe¹, Matthias Wollenhaupt², and Thomas Baumert¹ — ¹Universität Kassel, Institut für Physik und CINSaT, D-34132 Kassel, Germany — ²Carl von Ossietzky Universität Oldenburg, Institut für Physik, 26129 Oldenburg, Germany

Recently we reported on the selective excitation of K₂ using spectrally phase-shaped femtosecond laserpulses [1]. Here we present data about the controlled excitation of the same molecule by optimized double pulse sequences [2]. In addition first experimental evidence shows that femtosecond laserpulses that are shaped with spectral phases consisting of second and third order polynomial modulation [3] offer a high degree of control over the populations in selected electronic states of the potassium dimer. A detailed analysis of quantum dynamic simulations reveals different mechanisms at play.

[1] T. Bayer et al., Phys. Rev. Lett. 110, 123003 (2013)

[2] M. Wollenhaupt et al., JPPA 180, 248 (2006)

[3] J. Schneider et al., Phys. Chem. Chem. Phys. 13, 8733 (2011)