Observations and analysis of the K2 state using the infrared–infrared double resonance spectroscopy

Theoretical investigation of the Ωg,u(+/−) states of K2 dissociating adiabatically up to K(4p P23/2)+K(4p P23/2)

“…The quality of these predictions was confirmed later by some new experimental investigations on excited states, mainly triplet states. [24][25][26][27][28][29][30][31] Our previous studies of the electronic structure of K 2 were performed under the assumption that spin-orbit effects could be neglected for this not too heavy alkali dimer. Nevertheless, including these effects should lead to a more precise description of the electronic structure of K 2 .…”

Detailed spectroscopy of the Cs2a3Σu+state and implications for measurement

“…(The e SI,f representation is identical with the b β case of [47].) The transformation between e SI,f and e f af b,f is well known: (11) where the quantity in brackets is a 9J symbol. When rotation is considered, the molecular case e SI,f basis set becomes |[(S, I)f, ℓ]F M F , as stated above.…”

“…We measured 22 energy level differences to 30 MHz, and 6 absolute binding energies to 340 MHz to 420 MHz (one standard deviation combined statistical and systematic uncertainties are given). The second source is information on the Cs 2 a 3 Σ + u state from the work of Li, Xie et al [11,12] who obtained data on 1440 rovibrational levels observed by emission from an electronically excited triplet state. Although hyperfine structure was not resolved, these observations did yield much improved values for the a state dissociation energy and equilibrium internuclear distance, R e .…”

Scattering properties of the ultracold 133 Cs 2 triplet state

“…The ab initio potential energy curve of the a 3 Σ + u state of Cs 2 has been determined in the framework of the pseudopotential method in Ref. [22]. Their theoretical molecular constants are in good agreement with the measurements and the ones given by Weickenmeier et al [23] New ab initio molecular potential for the 133 Cs 2 triplet state will be extremely useful for allowing a comparison between the experimental results and hence for confirming the physical implications of the signs of the scattering parameter, and the number of bound states.…”

“…In the calculation of the interaction energy between two caesium atoms we consider several ranges of internuclear separations. For 0.2117 nm≤ R ≤0.889 nm, we use the latest ab initio interatomic potential curve given by Li et al [22] For R ≤0.2117 nm, we extend the ab initio potential curve in the exponential form…”