15min:

JIN-TAE KIM, Department of Photonic Engineering, Chosun University, Gwangju, 501-759, Korea; YONGHOON LEE, Department of Chemistry, Mokpo National University, Jeonnam 534-729, Korea; BONGSOO KIM, Department of Chemistry, KAIST, Daejeon, 305-701, Korea; DAJUN WANG, Department of Physics,The Chinese University of Hong Kong, Shatin, Hong Kong; PHILLIP L. GOULD, EDWARD E. EYLER AND WILLIAM C. STWALLEY, Department of Physics, University of Connecticut, Storrs, CT 06269-3046, USA.

The vibrational levels of the mutually strongly perturbed 1 ¹ - 2 ^{3 +} - b ³ states of ³⁹K⁸⁵Rb were previously assigned by using a combination of molecular beam and ultracold molecule (UM) excitation spectra, the latter generated from levels of the a ^{3 +} state formed following photoassociation to a level of the 3(0^-) state. In a follow-on study using the same techniques, we have now successfully assigned high vibrational levels of the A and 3 ^{1 +} states from the excitation spectra of UMs formed by PA to both 3(0⁺) and 3(0^-) levels. The ^{1 +} states are absent in the UM spectra for levels formed by the 3(0^-) PA level. This absence has been explained by considering Hund's case (c) selection rules and the transition dipole moment calculations by Kotochigova et al. between the upper excited A ^{1 +}(2(0⁺)) state and the three components at the ground state dissociation limit. This work is supported by NRF in Korea (Grant 2009-0085319 at Chosun and Grants 2011-0001335 and 2011-0020419 at KAIST) and by NSF (Grant PHY-0855613) and AFOSR (Grant MURI FA9550-09-1-588) in the US.