Darmstadt 2008 – scientific programme
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A: Fachverband Atomphysik
A 12: Posters: Interaction with intense laser pulses
A 12.15: Poster
Tuesday, March 11, 2008, 16:30–18:30, Poster C3
Multiphoton ionization of laser cooled lithium — •Michael Schuricke, Ganjun Zhu, Johannes Albrecht, Jochen Steinmann, Konstantinos Simeonidis, Alexander Dorn, and Joachim Ullrich — Max Plank Institut für Kernphysik, 69117 Heidelberg, Germany
Being the most fundamental three electron system, lithium is of particular interest for both theoretical and experimental investigations on quantum-dynamical few-body processes. In order to make lithium accessible to kinematically complete measurements of atomic fragmentation by particle or photon impact, a magneto-optical trap (MOT) has been combined for the first time with a so called reaction microscope. Since the reaction microscope has the capability of coincident measurements of the full vector momenta of all charged fragments, the electrons as well as the residual ion, and the MOT provides an ultracold target of atomic lithium in the sub-mK regime, highly resolved momentum spectra can be obtained. Besides, ionization can be examined both from the ground and exited states.
As a first step, multiphoton ionization of lithium in intense laser fields, using 30 fs pulses at 800 nm wavelength from a Ti:Sa fs-laser system was studied. Here, angle- and energy resolved ion- and electron-spectra, taken at intensities between 1011 and 1014 W/cm2, are presented.
Future experiments will include double ionization in intense fields, single photon double ionization at FLASH and studies of electron impact ionization of lithium in prepared states.