Berlin 2005 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 24: Poster Laserspektroskopie
Q 24.1: Poster
Montag, 7. März 2005, 11:00–12:30, Poster HU
Experimental study of Ca2 coupled states: Inversion analysis aiming on collisional effects on the intercombination line of Ca — •O. Allard1, St. Falke1, A. Pashov2, O. Dulieu3, H. Knöckel1, and E. Tiemann1 — 1Institut für Quantenoptik, Universität Hannover, Welfengarten 1, 30167 Hannover — 2Institute for Scientific Research in Telecommunications, ul. Hajdushka Poliana 8, 1612 Sofia, Bulgaria — 3Laboratoire Aimé Cotton, CNRS, Bât 505, Campus d’Orsay, 91405 Orsay Cedex, France
Transitions of the Ca2 A1Σu-X1Σg system are observed in a LIF experiment combined with high-resolution Fourier-transform spectrometry. Term energies of the perturbed A1Σu state are constructed using the well known X1Σg ground state [1]. We realized a depertubation analysis considering a model, which is complete within the A1Σu c3Πu a3Σu subspace of relevant neighboring states, in order to derive diabatic (with respect to the spin-orbit and rotation interaction) potential curves and R-dependent spin-orbit coupling directly from measured transition frequencies. Eigen energies of this coupled system are calculated employing the Fourier grid Hamiltonian method. Our analysis leads to a representation very close to the experimental uncertainty.
The Ω=0 component of the c3Πu state and the Ω=1 component of the a3Σu state are correlated to the asymptote 1S0+(4s4p) 3P1 and hence describe cold collisions of atoms with these states, which are of interest for an optical frequency standard on the intercombination line of Ca.
[1] O. Allard et.al.: Eur. Phys. J. D 26, 155 (2003) and Phys. Rev. A 66, 042503 (2002)