High Resolution Molecular Spectroscopy for Producing Ultracold Absolute Ground-State ${}^{23}$Na${}^{87}$Rb Molecules

Abstract

We report a detailed molecular spectroscopy study on the lowest excited electronic states of ${}^{23}{\mathrm{Na}}^{87}\mathrm{Rb}$ for producing ultracold ${}^{23}{\mathrm{Na}}^{87}\mathrm{Rb}$ molecules in the electronic, rovibrational and hyperfine ground state. Starting from weakly-bound Feshbach molecules, a series of vibrational levels of the $A^1{\Sigma }^{+}-b^3\Pi$ coupled excited states were investigated. After resolving, modeling and interpreting the hyperfine structure of several lines, we successfully identified a long-lived level resulting from the accidental hyperfine coupling between the $0^{+}$ and $0^{-}$ components of the $b^3\Pi$ state, satisfying all the requirements for the population transfer toward the lowest rovibrational level of the X${}^1{\Sigma }^{+}$ state. Using two-photon spectroscopy, its binding energy was measured to be 4977.308(3) cm${}^{-1}$, the most precise value to date. We calibrated all the transition strengths carefully and also demonstrated Raman transfer of Feshbach molecules to the absolute ground state.

References in corpus (19)

• Feshbach Resonances in Ultracold Gases
• A High Phase-Space-Density Gas of Polar Molecules
• The physics of dipolar bosonic quantum gases
• Production of cold molecules via magnetically tunable Feshbach resonances
• Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state
• Ultracold Dipolar Gas of Fermionic ${}^{23}$Na${}^{40}$K Molecules in their Absolute Ground State
• Creation of ultracold ${}^{87}$RbCs molecules in the rovibrational ground state
• Creation of an ultracold gas of ground-state ${}^{23}{\mathrm{Na}}^{87}\mathrm{Rb}$ molecules
• Calculation of accurate permanent dipole moments of the lowest ${}^{1,3}{\Sigma }^{+}$ states of heteronuclear alkali dimers using extended basis sets
• Novel quantum phases of dipolar Bose gases in optical lattices
• Molecular spectroscopy for ground-state transfer of ultracold RbCs molecules
• Formation of Ultracold NaRb Feshbach Molecules
• Observation of Feshbach resonances between ultracold Na and Rb atoms
• Hyperfine structure of alkali-metal diatomic molecules
• The potential of the ground state of NaRb
• Multi-channel modelling of the formation of vibrationally cold polar KRb molecules
• Model for the hyperfine structure of electronically-excited $\mathrm{KCs}$ molecules
• Mixing of 0${}^{+}$ and 0${}^{-}$ observed in hyperfine and Zeeman structure of ultracold Rb${}_2$ molecules
• Long-range states of the NaRb molecule near the Na($3^2{S}_{1/2}$)+Rb($5^2{P}_{3/2}$) asymptote

Cited by in corpus (16)

• Observation of Collisions between Two Ultracold Ground-State CaF Molecules
• Dipolar Collisions of Ultracold Ground-state Bosonic Molecules
• High-resolution Internal State Control of Ultracold ${}^{23}$Na${}^{87}$Rb Molecules
• Two-photon photoassociation spectroscopy of CsYb: ground-state interaction potential and interspecies scattering lengths
• The RbSr ${}^2{\Sigma }^{+}$ ground state investigated via spectroscopy of hot & ultracold molecules
• Efficient conversion of closed-channel dominated Feshbach molecules of ${}^{23}$Na${}^{40}$K to their absolute ground state
• Ultracold ${}^{88}{\mathrm{Sr}}_2$ molecules in the absolute ground state
• Singlet Pathway to the Ground State of Ultracold Polar Molecules
• Improved characterization of Feshbach resonances and interaction potentials between ${}^{23}$Na and ${}^{87}$Rb atoms
• Transition strength measurements to guide magic wavelength selection in optically trapped molecules
• Efficient Pathway to NaCs Ground State Molecules
• Observation of Microwave Shielding of Ultracold Molecules
• Characterization of the lowest excited-state ro-vibrational level of ${}^{23}$Na${}^{87}$Rb
• Genetics-based deperturbation analysis for the spin-orbit coupled ${\mathrm{A}}^1{\Sigma }^{+}$ and ${\mathrm{b}}^3{\Pi }_{0^{+}}$ states of LiRb
• Optimization of the Femtosecond Laser Impulse for Excitation and the Spin-Orbit Mediated Dissociation in the NaRb Dimer
• Optically trapped Feshbach molecules of fermionic ${}^{161}$Dy and ${}^{40}$K: Role of light-induced and collisional losses