High-resolution laser spectroscopy of the potassium-argon molecule: The BΣ state |
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Authors: | Markus Braune Dieter Zimmermann |
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Institution: | Technische Universität Berlin, Institut für Atomare Physik und Fachdidaktik, Hardenbergstrasse 36, D-10623 Berlin, Germany |
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Abstract: | The absorption spectrum of the KAr molecule has been observed with high resolution between 13 032 and 13 077 cm−1 using tunable laser diodes as light sources, a supersonic beam for production of the molecules, and laser-induced fluorescence for detection. In addition, optical-optical double resonance (OODR) experiments have been performed to simplify the spectrum and to get rotational assignment. Altogether, 670 lines due to the transition B2Σ+ ← X2Σ+ have successfully been assigned with vibrational levels of the B state ranging from v = 0 to v = 6. The corresponding energy values were fitted to the well-known Dunham expansion. In addition, we were able to analyse a local perturbation between the vibrational level v = 1 of the B state and v = 14 of the A2Π3/2 state. Unexpected extra lines in the OODR spectra are most probably due to a collision-induced population of other levels. For the equilibrium distance and the well-depth of the B state we obtain from the Dunham expansion 7.03 (8) Å and 26.2 (8) cm−1, respectively. |
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Keywords: | Molecular spectroscopy van der Waals molecules High-resolution laser spectroscopy Electronic spectra of molecules |
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