Osnabrück 2002 – wissenschaftliches Programm

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Q: Quantenoptik

Q 433: Poster: Laser – Grundlagen und Anwendungen

Q 433.20: Poster

Donnerstag, 7. März 2002, 16:30–18:30, Schloss

Study of the Ca₂ ground state by Fourier transform spectroscopy — •A. Pashov, O. Allard, H. Knöckel und E. Tiemann — SFB 407, Institut für Quantenoptik, Universität Hannover

We used laser-induced fluorescence (LIF) combined with a high resolution Fourier transform spectrometer to study the Ca₂ B¹ Σ _u⁺ − X ¹ Σ _g⁺ so-called green-system. Calcium dimers were produced in a stainless steel heat pipe oven heated up to 1300 K. The analysis of a total of 6364 differencies (with average experimental error of 0.008cm⁻¹)of B-X transition with a commin upper level has been used to construct the ground state potential energy curve (PEC). For this determination we used two different representations: an analytical and a point-wise potential. Using both representations we were able to determine accurate and identical (within the experimental error) PECs which describe the experimental data with a standard deviation of 0.0065cm⁻¹. This work has allowed us to make a reliable prediction of the dissociation energy D_e = 1102.3 ± 0.5 cm⁻¹ which differs significantly from the value of the previous study by C.R. Vidal, J. Chem. Phys. 72, 1864 (1980).