Guenadiy Lazarov

Predissociation of the F(4) 1Σg+ state of Li2

This paper reports measurements of the homogeneous predissociation of the Li2 F 1Σg+ state due to electrostatic interaction with the E 1Σg+ state. Ab initio potential energy curves have been calculated for both states which in the adiabatic representation show two avoided crossings. However, predissociation was not previously predicted. Our experimental results show that the three isotopomers 7Li2, 6Li7Li, and 6Li2 all strongly predissociate above the 2s+3s atomic limit. We report high resolution measurements of linewidths for a large number of F–state levels spread across the 2600 cm−1 energy region between the 2s+3s and 2p+2p atomic limits, which yield systematic information regarding the rotational, vibrational, and isotopomer dependence of the predissociation rate. An experimental RKR potential energy curve for the F state is derived and used to calculate predissociation rates whose trends show good agreement with the experimental values. This paper presents the first complete data set of observations...

Hyperfine structures of the 2 3Σg+, 3 3Σg+, and 4 3Σg+ states of Na2

The hyperfine structures of the 2 (3)Sigma(g) (+), 3 (3)Sigma(g) (+), and 4 (3)Sigma(g) (+) states of Na(2) have been resolved with sub-Doppler continuous wave perturbation facilitated optical-optical double resonance spectroscopy via A (1)Sigma(u) (+) approximately b (3)Pi(u) mixed intermediate levels. The hyperfine patterns of these three states are similar. The hyperfine splittings of the low rotational levels are all very close to the case b(betaS) limit. As the rotational quantum number increases, the hyperfine splittings become more complicated and the coupling cases become intermediate between cases b(betaS) and b(beta J) due to spin-rotation interaction. We present a detailed analysis of the hyperfine structures of these three (3)Sigma(g) (+) states, employing both case b(betaS) and b(beta J) coupling basis sets. The results show that the hyperfine splittings of the (3)Sigma(g) (+) states are mainly due to the Fermi-contact interaction. The Fermi contact constants for the two d sigma Rydberg states, the 2 (3)Sigma(g) (+) and 4 (3)Sigma(g) (+), are 245+/-5 MHz and 225+/-5 MHz, respectively, while the Fermi contact constant of the s sigma 3 (3)Sigma(g) (+) Rydberg state is 210+/-5 MHz. The diagonal spin-spin and spin-rotation constants, and nuclear spin-electronic spin dipolar interaction parameters of the 3 (3)Sigma(g) (+) and 4 (3)Sigma(g) (+) states are also obtained.

The Na2 2Πg3 state: New observations and hyperfine structure

Many more Na2 2Πg3 v=0–43, Ω=0,1,2 levels have been observed by sub-Doppler continuous wave perturbation facilitated optical-optical double resonance fluorescence excitation spectroscopy and the hyperfine structure of the Ω=0 and 2 levels has been resolved. New molecular constants for the less perturbed v=0–43 levels have been obtained with these new and the previously reported data. The hyperfine coupling scheme of the observed 2Πg3 levels is close to Hund’s case aβ with a Fermi contact constant bF=160±5MHz, which is smaller than the Fermi contact constants of other Na2 triplet Rydberg states, bF=200–245MHz.

Autler-Townes splitting and AC Stark shift in a diatomic alkali vapor

Summary form only given. Autler-Townes (AT) splitting and the AC Stark shift in a molecular gas have only recently been investigated. In our work we utilize a CW optical-optical double resonance (OODR) excitation scheme to measure the Doppler-free AT splitting and AC Stark shift in Li/sub 2/ vapor.