Hannover 2003 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

A: Atomphysik

A 15: Atomspektroskopie 2

A 15.6: Vortrag

Donnerstag, 27. März 2003, 15:15–15:30, F342

A molecular frequency reference for the charge radius determination of ¹¹Li — •Guido Ewald¹, Andreas Dax², Agnieszka Gluzicka³, Wilfried Nörtershäuser⁴, Rodolfo Sanchez¹, Reinhard Kirchner¹, H.-Jürgen Kluge¹, Thomas Kühl¹, Isao Tanhiata⁵, Marco Tomaselli¹, and Claus Zimmermann⁴ — ¹GSI Darmstadt, Germany — ²PSI, Villingen, Switzerland — ³Department of Physics, Warsaw University, Poland — ⁴Physikalisches Institut, Universität Tübingen, Germany — ⁵RIKEN, Japan

We are preparing an isotope shift measurement for ^8,9,11Li to determine the charge radii of these isotopes, particularly of the halo nucleus ¹¹Li. A master-slave diode laser has been stabilized to a hyperfine line in the X ¹Σ_g⁺→ B0_u⁺ R(114) 11-2 transition of molecular ¹²⁷I₂ at λ=735 nm using frequency modulation (FM) saturation spectroscopy. This system serves as a reference laser for RF-offset locking of a titanium-sapphire laser, which will be finally used to scan across the 2S-3S two-photon transition in atomic lithium. The relative frequency accuracy required for the isotope shift measurement is < 200 kHz. In order to characterize the performance of the stabilization chain and to test the relock-accuracy of the reference laser we used the Ti:Sa laser to measure the hyperfine splitting in the iodine line. The results of these measurements will be reported.