Highly sensitive photoassociation spectroscopy of ultracold 23Na133Cs molecular long-range states below the 3S1/2+6P1/2 limit. (March 2019)

• Record Type: Journal Article
• Authors: Li, Chenyang; Liu, Wenliang; Wu, Jizhou; Wang, Xiaofeng; Li, Yuqing; Ma, Jie; Xiao, Liantuan; Jia, Suotang
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 225(2019)
• Page Start: 214
• Page End: 218
• Publication Date: 2019-03
• Subjects: Photoassociation -- Ultracold NaCs molecules -- Dispersion coefficients -- Potential energy curve; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2018.12.028
• Languages: English
• ISSNs: 0022-4073

Abstract

Highlights: High resolution spectroscopy of A 1 Σ + state in long range part of ultracold polar NaCs molecules. Precision data for the binding energies of each vibrational levels have been demonstrated. Accurate values of the long-range molecular dispersion coefficients C 6 and C 8 have been deduced by using Levenberg–Marquardt algorithm method during the fitting of improved LeRoy–Bernstein formula to the experimental data. The potential energy curves for long-range parts of the NaCs molecular A 1 Σ + state are acquired based on the precise values of C 6 and C 8 . Abstract: This article describes the preparation of ultracold heteronuclear polar excited NaCs molecules through photoassociation in a dual-species magneto-optical trap. Ten resonant positions are observed below the Na (3S1/2 ) + Cs (6P1/2 ) dissociation limit using trap-loss spectroscopy based on a highly sensitive modulation technique. We deduce the long-range molecular coefficients by fitting an improved LeRoy–Bernstein formula to our experimental data using the Levenberg–Marquardt algorithm implemented in Mathematica software, and derive the empirical potential energy curve in the long-range region; we also verify the application of the improved LeRoy–Bernstein formula to the ultracold NaCs molecule.