Hyperfine structure of methanol lines at 25 GHz
Abstract
High-dispersion (channel width 0.015 km s^-1) laboratory spectroscopy of the torsion-rotation lines J_2 - J_1 (J = 2 - 6) in the ground torsional state (vt = 0) of the E-type methanol demonstrates multicomponent hyperfine splitting patterns at 25 GHz. The observed patterns are compared with simulations of CH3OH emission lines based on ab initio quantum-mechanical models. A substantial disparity between the laboratory and simulated patterns is revealed. The observed morphology of the line shapes is not reproduced in the model profiles. The found inconsistency requires further refinement of the current quantum-mechanical models to fit the observed hyperfine splitting patterns at 25 GHz.
Keywords
Cite
@article{arxiv.2310.08231,
title = {Hyperfine structure of methanol lines at 25 GHz},
author = {J. S. Vorotyntseva and S. A. Levshakov},
journal= {arXiv preprint arXiv:2310.08231},
year = {2023}
}
Comments
10 pages, 3 figures, Proc. of the conference "Physics of the ISM: from local cloud to early galaxies", dedicated to the memory of N.G. Bochkarev, Moscow, May 25-26, 2023; to appear in AApTr, vol. 34, N 2, 2023