Hannover 2010 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 1: Laser-Resonanzionisation, REMPI und MALDI

MS 1.5: Vortrag

Montag, 8. März 2010, 15:30–15:45, F 428

Two-photon spectroscopy inside a hot cavity — •Christoph Mattolat1, Hideki Tomita2, Tina Gottwald1, Sebastian Raeder1, Sebastian Rothe3, Fabio Schwellnus1, and Klaus Wendt11Johannes Gutenberg-Universität, Mainz — 2Nagoya University, Nagoya, Japan — 3Cern, Genf, Schweiz

At on-line isotope separators like ISOLDE/Cern access to the study of exotic radioisotopes is given. A severe limitation for any spectroscopic investigations is the life time of the isotope of interest. Therefore, in-source resonance ionization spectroscopy is performed to access extremly short lived isotopes. Nevertheless, this method suffers from the large Doppler broadening of the observed resonance lines due to the hot environment in the source necessary for a fast release of the atoms. One approach to overcome this limitation is found in two-photon spectroscopy in combination with resonance ionization by which ions can be created directly inside the hot ionizer cavity without Doppler broadening. Resonance ionization usually makes use of pulsed lasers with high power and a spectral line width of a few GHz, while for two-photon spectroscopy it is essential to use a well adapted laser with narrow line width. An injection seeded Ti:sapphire laser which operates at high repetition rate and offers an average output power of about 2.5 W at a line width of 20 MHz fulfills these needs. The general feasibility of Doppler free two-photon resonance ionization spectroscopy inside a hot cavity and the suitability of this laser has been demonstrated in investigations of the hyperfine structures of the 3s2 3p2 3P → 3s2 3p4p 3P multiplet in 29Si, which could be well resolved.

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