Perturbation analysis of the B 1Π state of 23Na85Rb molecule

Abstract

A number of the rovibrational levels of the B 1Π state are found to be strongly perturbed. The energy shifts of the e and f levels of the B 1Π state are studied, and the perturbations between the B 1Π and (2) 3Σ+ states and between the B 1Π and (1) 3Π1 states are identified. Forty-seven centers of perturbation are observed, and the molecular constants of the (2) 3Σ+ and (1) 3Π1 states are estimated. The hyperfine splitting of the (2) 3Σ+ state is observed. Each rovibrational level splits primarily into four lines, and each of the four lines splits into six lines. The splitting is identified as originating from the magnetic dipole interaction primarily with the nuclear spin of 23Na (I=3/2) and secondarily with the nuclear spin of 85Rb (I=5/2).

The 4 3Σ+ state of NaK: Potential energy curve and hyperfine structure

“…Five previously known 1,50,51 intermediate state window levels ͑listed in Table I͒ were used to record the present spectra. In all, 114 transitions were recorded, representing 4 3 ⌺ ϩ vibrational levels ranging from 0 to 33 and rotational levels Nϭ14, 16,25,26,27,28,37,39,44, and 46 ͑107 total 4 3 ⌺ ϩ levels͒. The observed transitions are available electronically.…”

Ab initio spectroscopic study for the NaRb molecule in ground and excited states

“…The heteronuclear alkali dimmers have attracted interest of both experimental and theoretical scientists involved in various fields: collision dynamics at threshold, photoassociative spectroscopy, and laser cooling and trapping of alkali atoms and remains an attractive research domain . They are at the bridge between various domains and techniques such as high‐resolution molecular spectroscopy, quantum computing using ultracold polar molecules as a new platform, tests of fundamental theories, in addition to ultracold molecular collision dynamics .…”

“…Much research efforts have been devoted to the study of the electronic structure of the NaRb molecule, and the experimental studies have investigated not only the ground state 1 1 Σ + but also the excited states 2 1 Σ + , 3 1 Σ + , 6 1 Σ + , 1 3 Σ + , 1 1 Π, 2 1 Π, 1 3 Σ. In Ref.…”

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.…”