New observation and combined analysis of the Cs2g−, u+, and 1g states at the asymptotes 6S1/2 + 6P1/2 and 6S1/2 + 6P3/2

Abstract

We report on new observations of the photoassociation spectroscopy of ultracold cesium molecules using a highly sensitive detection technique and a combined analysis with all observed electronic states. The technique is achieved by directly modulating the frequency of the trapping lasers of a magneto-optical trap. New observations of the Cs2 0g(-), 0u(+), and 1g states at the asymptotes 6S1/2 + 6P1/2 and 6S1/2 + 6P3/2 are reported. The spectral range is extended to the red detuning of 112 cm(-1) below the 6S1/2 + 6P3/2 dissociation limit. Dozens of vibrational levels of the ultracold Cs2 0g(-), 0u(+), and 1g states are observed for the first time. The available experimental binding energies of these states are analyzed simultaneously in a framework of the generalized LeRoy-Bernstein theory and the almost degenerate perturbation theory by Marinescu and Dalgarno [Phys. Rev. A: At., Mol., Opt. Phys. 52, 311 (1995)]. The unique atomic-related parameter c3 governing the dispersion forces of all the molecular states is estimated as (10.29 ± 0.05) a.u.

Manipulation of photoassociation of ultracold Cs atoms with tunable scattering length by external magnetic fields

“…The PA spectroscopy is measured by detecting the loss of Cs atoms optically trapped in a crossed ODT as a function of PA laser frequency. If the PA laser frequency is resonant with the energy difference between the scattering state of colliding atomic pairs and the bound excited state of diatomic molecule in a particular rovibrational level, the pure long-range state Cs 2 molecule is produced in the outer well of the double–well potential of the ( ) state 26 , 27 . Figure 1 shows a typical PA spectrum of the rovibrational level , of the electronically excited state of Cs 2 .…”

Laser cooling of internal degrees of freedom of molecules

“…[24,25], has a potential curve with a distinct double-well shape, with a deep inner well with an equilibrium distance of roughly 10 a.u. and a shallow outer well caused by the competition between the long-range electrostatic interaction between the 6s and the 6p atoms (varying as R −3 , where R is the internuclear distance) and the spin-orbit interaction, which couples the (1) 3 Σ + g (6s+6p) state and the (1) 3 Π g (6s + 6p) state.…”

Photoassociation of Ultracold CsYb Molecules and Determination of Interspecies Scattering Lengths

“…However, deeply bound ground state molecules may be produced through decay in some exceptional systems [53,54,160] [52,[161][162][163][164][165][166].…”