Formation of ultracold, highly polar X¹Σ⁺NaCs molecules

Spin-forbiddenc3Σ+(Ω=1)←Grochola1, Kowalczyk2, Szczepkowski3 et al. 2011Phys. Rev. A241130View full textAdd to dashboardCite

“…The forbidden transition (1) = 2 ← X(1) = 0 + apparently gains some intensity due to a mixing of the (1) = 2 state with the two neighboring = 1 states close to their common atomic asymptote. The same state was reported before in the PA spectra [9]. Unfortunately, the scarcity of the observed spectral lines and lack of information about the bottom of the (1) = 2 state did not allow us to pursue its analysis.…”

“…Only five states have been characterized, namely the two lowest states, X 1 + and a 3 + [1,2], and three excited states, B(1) 1 , D(2) 1 , and 3 1 [1,[3][4][5][6]. Further spectroscopic studies on additional electronic states are necessary to complete our understanding, to test ab initio theoretical predictions, and to facilitate experiments on the formation of ultracold NaCs molecules [7][8][9][10][11].…”

Hyperfine structure in the microwave spectra of ultracold polar molecules

“…This has been achieved for both polar 40 K 87 Rb [2] and nonpolar Cs 2 [3] and triplet 87 Rb 2 [4], and several other systems are being pursued [5,6,7]. It is also now possible to produce low-lying molecular states by direct photoassociation [8,9,10,11,12].…”

Manipulating ultracold polar molecules with microwave radiation: The influence of hyperfine structure

“…This has now been achieved for KRb [4], Cs 2 [5, 6, 7] and triplet Rb 2 [8]. RbCs [9], LiCs [10] and NaCs [11] have also been prepared in deeply bound states, but so far by incoherent methods.The bound states of diatomic molecules are described by vibrational and rotational quantum numbers v and N . However, this does not suffice to specify the state completely, as most molecules also possess complicated hyperfine structure [12,13], even for singlet molecules in N =0 states [14,15].…”