High-resolution laser spectroscopy of the X1Σ+ and (1)3Σ+ states of 23Na85Rb molecule

Abstract

High-resolution spectra of the B1Π→X1Σ+ transition of 23Na85Rb molecule are measured by the technique of the Doppler-free optical–optical double resonance polarization spectroscopy (OODRPS). The molecular constants of the X1Σ+(v″=5−30) levels are determined, and the potential energy curve is constructed up to v″=30 by the RKR method. The time-resolved fluorescence intensity following the excitation to the B1Π(v′=5,J′= around 20) level is measured, and the lifetime of the B1Π(v′=5) level in collisionless limit is determined to be 17.8 ns. The absolute value of the electric dipole moment of the B1Π−X1Σ+ transition is determined to be 7.0 D in the region of 3.73 Å<R<4.98 Å. Transition lines to the (1)3Σ+ state from the B1Π(v′=8,J′=15) level, which is perturbed by the (1)3Π1(v0,N=J=15) level, are measured by the Doppler-free OODRPS. The energy spacing between the F1 and F3 components of the (1)3Σ+(v=4,N=15) level is observed to be smaller than 0.001 cm−1. The hyperfine splittings, which are described by Hund’s case (bβS), are observed, and the hyperfine constants ANa and ARb of the (1)3Σ+(v=4) level are determined to be 0.0293 and 0.0336 cm−1, respectively. The hyperfine splittings are identified as originating from the Fermi contact interaction. From the analysis, it is concluded that the electron spins in the (1)3Σ+ state are almost equally populated to the 5sRb and 3sNa orbitals.

XΣ+1andaΣ+Staanum1, Pashov2, Knöckel3 et al. 2007Phys. Rev. A1199592View full textAdd to dashboardCite

“…Calculations similar to those in Ref. [35] show that the observed splitting is well reproduced by the Fermi contact interaction model applying the atomic HFS constants for 7 Li and 133 Cs [36]. In Fig.…”

Calculation of the interspeciess-wave scattering length in an ultracold Na-Rb vapor

“…Rovibrational states to within 5% of dissociation have been observed in both the triplet a 3 Σ + [18] and singlet X 1 Σ + potential wells [19,20]. The rotationless interatomic potentials V s (r) and V t (r), corresponding to the X 1 Σ + and a 3 Σ + states, respectively, have been determined through RKR analysis, and a direct fit to the singlet spectrum [20] using a modified Lennard-Jones (MLJ) [21] parametrization has also been performed.…”

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“…2, the experimental lifetimes coincide with the lifetimes calculated in this work within the experimental error (±4%). In [31], the life time of the B 1 Π state of NaRb for the vibrationalrotational level v = 5, j ~ 20 was measured to be = 17.8 ns. This value agrees well with the lifetime calcu lated in this study ( = 17.61 ns).…”