Stimulating the production of deeply bound RbCs molecules with laser pulses: the role of spin-orbit coupling in forming ultracold molecules

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 moleculeSinglet statePhysicsMoleculeExcited statePotential energyHomonuclear moleculeQuantum dynamicsAtomic physicsSpin–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.

参考文章(59)
T. Bergeman, A. J. Kerman, J. Sage, S. Sainis, D. DeMille, Prospects for production of ultracold X 1Σ+ RbCs molecules European Physical Journal D. ,vol. 31, pp. 179- 188 ,(2004) , 10.1140/EPJD/E2004-00155-6
DAVID EDVARDSSON, STEN LUNELL, CHRISTEL M. MARIAN, Calculation of potential energy curves for Rb2 including relativistic effects Molecular Physics. ,vol. 101, pp. 2381- 2389 ,(2003) , 10.1080/0026897031000121307
Andrew J. Kerman, Jeremy M. Sage, Sunil Sainis, Thomas Bergeman, David DeMille, Production of ultracold, polar RbCs* molecules via photoassociation Physical Review Letters. ,vol. 92, pp. 033004- ,(2004) , 10.1103/PHYSREVLETT.92.033004
V. Kokoouline, O. Dulieu, R. Kosloff, F. Masnou-Seeuws, MAPPED FOURIER METHODS FOR LONG-RANGE MOLECULES : APPLICATION TO PERTURBATIONS IN THE RB2(0U+) PHOTOASSOCIATION SPECTRUM Journal of Chemical Physics. ,vol. 110, pp. 9865- 9876 ,(1999) , 10.1063/1.478860
Robert J. LeRoy, Richard B. Bernstein, Dissociation Energy and Long‐Range Potential of Diatomic Molecules from Vibrational Spacings of Higher Levels The Journal of Chemical Physics. ,vol. 52, pp. 3869- 3879 ,(1970) , 10.1063/1.1673585
Silke Ospelkaus, A Pe’Er, K-K Ni, JJ Zirbel, B Neyenhuis, S Kotochigova, PS Julienne, J Ye, DS Jin, None, Efficient state transfer in an ultracold dense gas of heteronuclear molecules Nature Physics. ,vol. 4, pp. 622- 626 ,(2008) , 10.1038/NPHYS997
L. Allen, Joseph H. Eberly, Optical resonance and two-level atoms ,(1975)
Jenning Y. Seto, Robert J. Le Roy, Jean Vergès, Claude Amiot, Direct potential fit analysis of the X 1Σg+ state of Rb2: Nothing else will do! The Journal of Chemical Physics. ,vol. 113, pp. 3067- 3076 ,(2000) , 10.1063/1.1286979
Eric R. Hudson, Nathan B. Gilfoy, S. Kotochigova, Jeremy M. Sage, D. DeMille, Inelastic collisions of ultracold heteronuclear molecules in an optical trap. Physical Review Letters. ,vol. 100, pp. 203201- ,(2008) , 10.1103/PHYSREVLETT.100.203201
L. P. Yatsenko, B. W. Shore, T. Halfmann, K. Bergmann, A. Vardi, Source of metastable H(2s) atoms using the Stark chirped rapid-adiabatic-passage technique Physical Review A. ,vol. 60, ,(1999) , 10.1103/PHYSREVA.60.R4237