Brett Hallen Isselhardt

High-useful yield and new autoionizing state of resonantly ionized Tungsten Danielle Ziva Shulaker, Reto Trappitsch, Michael R. Savina and Brett Hallen Isselhardt Abstract In order to measure tungsten isotopic composition in presolar stardust grains that contain a limited number of atoms, we developed a new three-photon three-color resonance ionization scheme using titanium–sapphire lasers and the Laser Ionization of Neutrals (LION) instrument at Lawrence Livermore National Laboratory.

The isotopic composition of titanium in meteoritic phases can be used to decipher processes such as stellar nucleosynthesis and galactic chemical evolution. In order to facilitate analyses of trace amounts of titanium in atom-limited samples, we established a new three-step resonance ionization scheme. The scheme was developed using titanium-sapphire lasers and we show that it can be easily saturated and that it yields stable isotope measurements.