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APS

Formation of ultracold ground-state rubidium molecules in a magnetic-optical trap via photoassociation and their detection by time-of-flight mass spectroscopy

Jing Qi, Yin Hui Huang, H. Kim, Edward E. Eyler, P. L. Gould, W. C. Stwalley

Published May 1, 2004• 0 citations
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The photoassociative spectroscopy, photoassociative molecule formation, and trapping of ultracold 39K85Rb\mathsf{^{39}K^{85}Rb}39K85Rb
We use time-of-flight mass spectroscopy to detect the ultracold ground state Cs2 molecules formed directly by a photoassociation due to the trapping laser beams and repumping laser beam in a magneto-optical trap. We investigate the dependences of the Cs2+ intensity on operating voltage of micro-channel-plate, accelerating field intensity and duration time of the accelerating field. The experimental results are consistent with theoretical fitting. We obtain the best optimal parameters suited to our experimental condition, which is important for the future experiment on ultracold molecule photoassociation and photoionization spectroscopy.
We present photoassociation spectroscopy of ultracold NaCs molecules formed in a dual-species magneto-optical trap. Excited-state molecules are formed in states correlating to the Na(3S 1/2 )+Cs(6P 3/2 ) asymptote. We assign the most prominent observed vibrational progression to the Ω=2 long range state based on a comparison with ab initio potentials. Molecules are secondarily excited before decaying to deeply bound levels of the electronic ground X 1 Σ + state where they are ionized and detected by time-of-flight mass spectroscopy.