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MS: Fachverband Massenspektrometrie

MS 9: Resonance Ionization Mass Spectrometry

MS 9.3: Vortrag

Donnerstag, 14. März 2019, 14:45–15:00, U A-Esch 2

Automated Grating-Tuned Intra-Cavity Doubled Ti:Sapphire Laser for Fast Element Switching in RIMS — •Felix Weber, Vadim Gadelshin, Dominik Studer, Tom Kieck, and Klaus Wendt — Johannes Gutenberg Universität, Mainz

Laser resonance ionization mass spectroscopy is a versatile technique for efficient and selective ionization, used for atomic and nuclear physics studies of exotic species as well as for elemental ultra-trace analysis. This technique uses the unique atomic energy level systems for a multi-step ionization scheme in combination with mass spectrometry for selection of the isotope of interest. All lanthanide elements can be easily and efficiently ionized by two-step excitation schemes using second harmonic generation (SHG) of Ti:sapphire laser light. An automated grating-tuned laser with intra-cavity second harmonic generation provides high output power up to 1W over a wavelength range from 375 nm to 475 nm with a single BBO crystal. The combination of grating tuning with closed loop operation of the SHG piezo actuator allows rapid switching between different excitation wavelengths. The successive addressing of a specific element in one sample with switching times of just a few seconds has been demonstrated on mixtures of nine lanthanide elements. The properties of the laser system, excitation scheme development and results for a successive extraction of a single lanthanide from the mixture will be discussed.