Stuttgart 2012 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 21: Poster 3: Cluster, Collisions, Energy Transfer, Photochemistry, Spectroscopy in He-Droplets

MO 21.26: Poster

Donnerstag, 15. März 2012, 16:30–19:00, Poster.IV

Probing doped helium nanodroplets with amplified femtosecond laser pulses — •Manuel Rometsch, Barbara Grüner, Amon Sieg, Frank Stienkemeier, and Marcel Mudrich — Physikalisches Institut, Universität Freiburg, 79104 Freiburg, Germany

Superfluid helium nanodroplets doped with atoms and molecules are intriguing systems at the border between gas-phase and condensed matter physics. We present experiments on the photoionization of doped helium nanodroplets using different femtosecond lasers, ranging from a high-repetition rate (80 MHz) Ti:Sa oscillator in the NIR to an amplified low-repetition rate (5 kHz) OPA-system covering wavelengths from the NIR to the UV. One- and two-color pump-probe schemes are applied in combination with photoion and photoelectron detection. This gives access to a wide spectrum of dynamical phenomena, such as the desorption off the droplet surface and alkali-helium exciplex formation [1], droplet induced relaxation [2], as well as the ignition of a nanoplasma [3].

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

[2] Grüner et al., PCCP 13, 6816 (2011)

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