Düsseldorf 2007 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 5: Precision spectroscopy II
A 5.2: Vortrag
Montag, 19. März 2007, 16:45–17:00, 6G
The 2s-3s transition frequency in Lithium — •Monika Zakova1, Kamalesh Dasgupta3, Guido Ewald2, Christopher Geppert2, Matthias Nothhelfer1, Rodolfo Sanchez1, and Wilfried Nörtershäuser1,2 — 1Institut für Kernchemie, Mainz, Deutschland — 2GSI, Darmstadt, Deutschland — 3B.A.R.C., Bombay, Indien
We report on an absolute measurement of 2s-3s transition frequency in lithium. This measurement allows a test of theoretical calculations of transition frequencies and isotope shifts in the three-electron system of atomic lithium. It is performed with a Ti:Sa laser at 735 nm that is stabilized to a diode laser via frequency-offset locking. The diode laser is locked to a frequency comb. Resonant excitation of the lithium atoms is detected via resonance ionization mass spectroscopy: after excitation into the 3s states, the atoms are ionized along the 3s-2p-3d-Li+ path, mass analyzed with a quadrupole mass filter and then detected with a channeltron-type detector. These measurements will complete previous investigations of the isotope shift of all lithium isotopes.