A Molecular Beam Electric Resonance Study of the Hyperfine Λ Doubling Spectrum of OH, OD, SH, and SD

Abstract

The molecular beam electric resonance method was employed to obtain a complete set of hyperfine Λ doubling transitions of the free radicals OH, OD, SH, and SD. The observed spectra could be explained very well by the degenerate perturbation theory adapted to the 2Π state. The experimental results include fine and hyperfine coupling constants, the electric dipole moments could be explained very well by the degenerate perturbation theory adapted to the 2Π state. The constants agree well with ab initio calculations.

Rotational Spectrum of CBr by Kinetic Microwave Spectroscopy of 193-nm Photolysis Products of Bromoform

“…The hyperfine parameters use the formalism of Meerts and Dymanus (13)(14)(15) with an extension to the centrifugal distortion (16). Third-order terms could not be fitted correctly and were set to zero.…”

L.M.R. observation of the sulphur hydride free radical SD in itsX2Π3/2ground state

“…The first assignment of the transitions was obtained by a prediction employing the parameters given in [2,3,13]. For the fit of the molecular parameters the program described in [14] was used but with the zero field hamiltonian given in [15], cf.…”

“…The (0-0) and the (0-1) band of the A 2E+-X 2II system of both isotopes were observed by Ramsay [1] and Pathak and Palmer [2] in absorption and emission, while Meerts and Dymanus [3] received the hyperfine A-doubling spectrum of SH and SD by a molecular beam electric resonance experiment in the microwave region. Further studies on the A-doubling parameters of SH were made by Radford [4] and Brown [5].…”

Hyperfine Interaction Constants of the HCCS and DCCS Radicals Studied by Fourier Transform Millimeter-Wave Spectroscopy

“…It is interesting to compare the hyperfine interaction constant a with d + (19), and SH (0.853) (20), the obtained ratio for HCCS is even higher. In contrast, the ratio is as low as 0.485 for C 3 H (21), which is known to be a quasi-linear molecule due to the large Renner-Teller effect.…”