On the X¹Σ⁺rovibrational spectrum of lithium hydride

Abstract

The complete line list of rovibrational transitions of the X 1 Σ + state of LiH is computed. The line list includes all possible dipoleallowed transition energies and oscillator strengths that cover the transition energy range 3.27−19476 cm −1 . The line list was obtained using an accurate potential and dipole moment function constructed from available experimental and theoretical data. This paper discusses the agreement of the current calculations with previous theoretical and experimental results. We also provide the radiative cooling function in the high-density limit over a wide temperature range and compare them with previous results. A simulated collisionally-broadened LiH opacity relevant to cool dwarf stars is also presented.

Accurate potential energy curves of Li2 and LiH: A Quantum Monte-Carlo (QMC) study

“…In addition, the related experimental spectroscopic constants [28][29][30] [31], and vibration-rotation energy levels are employed to calculate the frequencies and spectroscopic constants. Tables 2 and 3 show the spectroscopic constants and vibrational frequencies with the related experimental values [28,32,33], respectively. In addition Coxon and Dickinson [30] did a good analysis of the reported spectroscopic data for LiH molecule.…”

“…In addition Coxon and Dickinson [30] did a good analysis of the reported spectroscopic data for LiH molecule. The constants, however, were not extracted fully, so the experimental values are used from reference [32]. Shi et al solved nuclear Schrodinger equation numerically and report accurate spectroscopic constants for LiH molecule [32]; however unfortunately they did not report to change the scale of rovibrational energies.…”

“…The constants, however, were not extracted fully, so the experimental values are used from reference [32]. Shi et al solved nuclear Schrodinger equation numerically and report accurate spectroscopic constants for LiH molecule [32]; however unfortunately they did not report to change the scale of rovibrational energies. For vibrational frequencies the are plotted against in Figure S1 in Supplementary Information.…”

Stimulated deceleration of diatomic molecules on multiple rovibrational transitions with coherent pulse trains

“…Due to its small mass, LiH is potentially one of the easier molecules to decelerate, although its Σ 1 electronic ground state makes it ill suited for Stark deceleration or Zeeman deceleration techniques. The ″ = → ′ = v v 0 1transition lies at a wavelength of 7 microns [51], with a transition dipole of 0.12 Debye [52]. As a hydride, only the lowest rotational state would have significant population in a cryogenic beam [53].…”

Effect of lithium hydride on the cooling of primordial gas

“…According to(Shi et al 2013), in principle, collisions with other abundant species, such as H 2 , He 0 , e − and H + , should be considered. Only using H 0 introduces uncertainties for n(collider) < n LiH,cr , as vibrational excitation rate coefficients for LiH − H 0 collisions are not available, and have to be estimated via massscaling from the LiH − He 0 rate.MNRAS 000, 1-10(2017)…”