Fourier Transform Spectroscopy of SrH: TheA-XandB-XBand Systems

Abstract

The absorption spectrum of SrH in the region 6800-7600 Å has been investigated by Fourier transform spectroscopy. A new calculation of the ground state molecular constants and a deperturbation of the A2Π/B2Σ+ interaction has been performed. Molecular constants of the deperturbed states are given.

Towards redistribution laser cooling of molecular gases: production of candidtate molecules SrH by laser ablation

“…The experimental spectrum is fitted with a sum of 8 Lorentzian curves having the same spectral width and centered at the positions of the rovibronic lines accordingly to the data of. 12,13 The individual contributions of 8 lines are also shown by dashed lines. The lines are labeled by the total angular momentum quantum numbers J of the corresponding lower states.…”

Time-Resolved Laser Spectroscopy

“…Since a larger transition moment leads to a higher transition probability, we would expect a higher intensity of the A 2 Π-X 2 Σ + transition than of the B 2 Σ + -X 2 Σ + transition. This has been seen in SrH by Appelblad et al [57] and in CaH by Berg et al. [114] The zero-pressure lifetime for J=5.5 B 2 Σ + (v=0)-X 2 Σ + (v=0) is 125(±12) ns where the errors corresponds to a value based on estimated errors in the pressure and lifetime measurements.…”

“…[52] In order to describe these kinds of chemical reactions in detail it is of great importance to know the characteristics of the molecular electronic transitions involved which is also essential in astrophysics. [56] The electronic states of the alkaline earth monohydrides, deuterides and halides have been investigated using various techniques, [57][58][59] including time resolved spectroscopy. [27,60] By combining results obtained from different experiments, the structure of these diatomic molecules has been quite well characterized.…”

“…The rotational and vibrational band systems of the lower lying excited electronic states of SrH, as well as SrD, has been investigated by Watson et al [67,68] and -12 -Appelblad et al, [57,69] and the ground states have been re-investigated by Frum et al [51] in 1994. In SrH, as in most of group IIA hydrides, the low lying excited states strongly perturb each other.…”

“…[30,52,57,62] The Einstein coefficient of spontaneous emission A v'v'' [s -1 ] is, according to wave mechanics in case of dipole radiation, related to the electronic dipole transition moment, R e (r v'v'' ) [Cm], in the r-centroid approximation as: [93,94] . The Franck Condon factor is dependent on the difference of the equilibrium internuclear distance of the two states involved.…”