https://doi.org/10.1140/epjd/e2007-00013-1
Frequency measurements in the b 3Π(0u+) - X 1Σg+ system of K2
1
Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
2
Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
Corresponding author: a tiemann@iqo.uni-hannover.de
Received:
17
November
2006
Published online:
19
January
2007
Absolute transition frequencies of the b 3Π(0u+) - X 1Σg+ system of K2 were measured in a molecular beam with Lamb dip absorption spectroscopy applying a frequency comb from a femtosecond pulsed laser. Both, K atoms and K2 molecules are present in the beam and are expected to interact by collisions. The atoms can be deflected optically out of the beam, and thus the collision rate between K atoms and K2 molecules is changed by about an order of magnitude. The molecular transition frequencies for low collisional rate are compared with those for high one. Limits for the collisional frequency shift within the beam are determined.
PACS: 33.20.Kf – Visible spectra / 33.70.Jg – Line and band widths, shapes, and shifts / 42.62.Fi – Laser spectroscopy / 06.30.Ft – Time and frequency
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007
