作者: Jeremy M Hutson , Richard J Doyle , Christiane P Koch , Subhas Ghosal
DOI: 10.1088/1367-2630/11/5/055011
关键词: Heteronuclear molecule 、 Singlet state 、 Physics 、 Molecule 、 Excited state 、 Potential energy 、 Homonuclear molecule 、 Quantum dynamics 、 Atomic physics 、 Spin–orbit interaction
摘要: We investigate the possibility of forming deeply bound ultracold RbCs molecules by a two-color photoassociation experiment. compare results with those for Rb2 in order to understand characteristic differences between heteronuclear and homonuclear molecules. The major arise from different long-range potential excited states. Ultracold 85Rb 133Cs atoms colliding on X 1Σ+ curve are initially photoassociated form region below Rb(5S)+Cs(6P1/2) asymptote. explore nature Ω=0+ levels this region, which have mixed A 1Σ+ b 3Π character. then study quantum dynamics time-dependent wavepacket (TDWP) approach. A is formed exciting few vibronic allowed propagate coupled electronic energy curves. calculate time dependence overlap ground-state vibrational levels. For detuning 7.5 cm−1 atomic line, reaches short-range about 13 ps, significantly faster than system; mostly because absence an R−3 tail excited-state curves systems. give simple semiclassical formula that relates taken parameters. RbCs, contrast Rb2, shows substantial peak singlet density near inner turning point, produces significant probability de-excitation up 1500 cm−1. depends strongly non-adiabatic coupling reduced if strength spin–orbit increased. Our analysis role concerns character states general important both stimulated Raman de-excitation.