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Bulletin of the American Physical Society

Resonant Coupling in the Heteronulcear Alkali Dimers for Direct Photoassociative Formation of X $^1\Sigma^+$ v$''$= 0 Ultracold Molecules

Jayita RayMajumder, Michael Bellos, Ryan Carollo, Matthew Recore, Michael Mastroianni, William C. Stwalley, Edward E. Eyler, P. L. Gould

Published May 21, 2009• 0 citations
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Resonant Coupling in the Heteronulcear Alkali Dimers for Direct Photoassociative Formation of X 1Σ+^1\Sigma^+1Σ+ v′′''′′= 0 Ultracold Molecules
Progress towards Direct Photoassociative Formation of Ultracold KRb Molecules in the lowest rovibronic state X 1Σ+,v=0,N=0X\,^1\Sigma^+, v=0, N=0X1Σ+,v=0,N=0
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Promising pathways for photoassociative formation of ultracold heteronuclear alkali metal dimers in their lowest rovibronic levels (denoted X(0,0)) are examined using high-quality ab initio calculations of potential energy curves currently available. A promising pathway for KRb, involving the resonant coupling of the 2(1)Pi and 1(1)Pi states just below the lowest excited asymptote (K(4s) + Rb(5p(1/2))), is found to occur also for RbCs and less promisingly for KCs also. The resonant coupling of the 3(1)Sigma(+) and 1(1)Pi states, also just below the lowest excited asymptote, is found to be promising for LiNa, LiK, and LiRb and less promising for LiCs and KCs. Direct photoassociation to the 1(1)Pi state near dissociation appears promising in the final dimers NaK, NaRb, and NaCs, although detuning more than 100 cm(-1) below the lowest excited asymptote may be required.
This review describes recent experimental and theoretical advances in forming molecules in ultracold gases of trapped alkali metal atoms, both by magnetic tuning through Feshbach resonances and by photoassociation. Molecular Bose-Einstein condensation of long-range states of both boson dimers and fermion dimers was achieved in 2002-3. Condensates of boson dimers were found to be short-lived, but long-lived condensates of fermion dimers have been produced. Signatures of triatomic and tetraatomic molecules have recently been observed. Both homonuclear and heteronuclear molecules have been formed by photoassociation, mostly in very high vibrational levels. Recent attempts to produce ultracold molecules in short-range states (low vibrational levels) are described. Experimental and theoretical work on collisions of ultracold molecules is discussed.