Stuttgart 2012 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 16: Collisions and Spectroscopy in He-Droplets

MO 16.7: Vortrag

Donnerstag, 15. März 2012, 12:00–12:15, V38.02

Photoionization dynamics of rubidium atoms attached to helium nanodroplets with amplified femtosecond laser pulses — •Barbara Grüner, Manuel Rometsch, Frank Stienkemeier, and Marcel Mudrich — Physikalisches Institut, Universität Freiburg, 79104 Freiburg, Germany

Photoionization of alkali-doped helium nanodroplets with femtosecond laser pulses entails complex dynamics which strongly depends on the laser pulse intensity. Low laser intensities allow for investigating the desorption process of the alkali atom off the surface of the helium droplet and may induce exciplex formation, depending on the excitation wavelength [1,2]. At high pulse intensities the ionization of the dopant atoms induces the ignition of a nanoplasma that resonantly couples to the laser field [3]. However, this has not been studied, so far, for dopants residing at the surface of the droplets. We present first experiments on the photoionization dynamics of alkali-doped He nanodroplets using an amplified femtosecond laser.

[1] Krishnan et al., Phys. Rev. Lett.107, 173402 (2011)

[2] Droppelmann, et al. Phys.Rev.Lett. 93, 023402 (2004)

[3] Mudrich et al., Phys. Rev. Lett. 100, 023401 (2008)