Berlin 2005 – wissenschaftliches Programm
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A: Atomphysik
A 7: Atoms and Ions in Ultra Short and Strong laser Fields I
A 7.2: Fachvortrag
Samstag, 5. März 2005, 09:00–09:15, HU 3094
A high harmonic laser source for XUV photoionization studies in a cold target recoil ion momentum spectrometer — •Martin Böttcher1, H. Rottke1, N. Zhavoronkov1, P. Agostini2,1, and W. Sandner1 — 1Max-Born-Institut, Max-Born-Str. 2a, D-12489 Berlin — 2DRECAM/SPAM, Centre d’Etudes de Saclay, 91191 Gif-sur-Yvette, France
We have set up a high harmonic laser source for investigating gas phase photoionization in a cold target recoil ion momentum spectrometer (COLTRIMS) in the extreme ultraviolet (XUV) wavelength range down to, presently, ≈ 30 nm. High order harmonic radiation is generated by focusing ultra-short Ti:Sapphire laser pulses (pulse width ≈ 40 fs) into Argon gas as the non-linear medium. For efficient generation a laser system is used which deliveres up to 6 mJ pulses at 1 kHz repetition rate. Single harmonics are selected with a grazing incidence monochromator and focused with a toroidal mirror on the gas target in our COLTRIMS setup. The target gas is supplied in a well collimated cold atomic beam (density ≈ 5 × 1010 cm−3). We will present first experimental results on correlated electron-ion momentum spectroscopy after single- and double- (Xe) photoionization of several noble gas targets using this short pulse, table top XUV light source.