Hyperfine structures of the triplet states of 23Na85Rb

Abstract

The sub-Doppler high resolution excitation spectrum of NaRb was measured by selectively monitoring the fluorescence intensity from perturbed levels to the (1)3Σ+ lower state. Many transitions were observed to the (2)3Σ+ state perturbed by B 1Π. Energy shifts of the perturbed levels were analyzed and the spin–orbit coupling constant between the (2)3Σ+ and B 1Π states was determined, together with molecular constants of each state. Fully resolved hyperfine splittings, induced by the coupling of electron spin with both 23Na and 85Rb nuclear spins, were observed in the transitions. By analysis of the observed splittings, the mechanism of perturbation was confirmed as due to Fermi contact interaction and hyperfine constants of the 23Na85Rb (2)3Σ+ state were determined. The ratio of electron spin densities at 23Na and 85Rb in the (2)3Σ+ state is estimated to be 0.84:0.16.

The coupling of the X$^{1}Σ^{+}$ and a$^{3}Σ^{+}$ states of KRb

“…This hypothesis seems to be reasonable if we compare it with the HFS of the (2) 3 Σ + state in NaRb observed by Matsubara et al in Ref. [23]. So, presently, we understand our observations in the following way: The HFS of the excited complex of singlet and triplet states in KRb is in some cases larger than the Doppler width of the transitions.…”

The adiabatic potentials of low-lying electronic states of the NaRb molecule

“…The photodissociation of the NaRb molecule was observed in 1987 [1]. Next, this photodissociation was studied with a variety of Dopplerfree laser techniques by the Kato group [8][9][10][11][12]. In 2000, heteronuclear hyperfine-state changing cold collisions (a magneto-optical trap containing both Na and Rb atoms) were studied by Young et al [13].…”

Permanent electric dipoles in B 1Π and D 1Π states of NaRb: Experiment and theory

“…Only the X 1 ⌺ ϩ and B 1 ⌸ electronic states have been studied systematically by high resolution methods of polarization spectroscopy and optical-optical double resonance spectroscopy. [6][7][8][9] The dense perturbation pattern discovered in the B 1 ⌸ state was ascribed to interaction with perturbing b 3 ⌸ and c 3 ⌺ ϩ triplet states correlating to the same atomic limit Na (3s)ϩ Rb (5p). As far as molecular terms correlating to the Na (3p)ϩRb (5s) atoms are concerned, only the D 1 ⌸ state has been studied 5 using LIF methods, namely, by exciting selectively the D 1 ⌸ (vЈ,JЈ)-levels with the fixed frequency Ar ϩ -laser lines and analyzing spectrally resolved D 1 ⌸(vЈ,JЈ)→X 1 ⌺ ϩ (vЉ,JЉ) LIF progressions.…”

“…The NaRb molecule has been recently intensively studied spectroscopically by the Katô group. [5][6][7][8][9] However, the existing spectroscopic information on NaRb is much scarcer than for NaK. Only the X 1 ⌺ ϩ and B 1 ⌸ electronic states have been studied systematically by high resolution methods of polarization spectroscopy and optical-optical double resonance spectroscopy.…”