This example deals with the tunneling-rotation interaction in the ground
vibrational state of the hydroxymethyl radical. The data set is based on
1) O. Chitarra, M.-A. Martin-Drumel, B. Gans, J.-C. Loison,
S. Spezzano, V. Lattanzi, H. S. P. Müller, and O. Pirali,
Reinvestigation of the Rotation-tunneling Spectrum of the CH2OH
Radical – Accurate Frequency Determination of Transitions of
Astrophysical Interest up to 330 GHz,
Astron. Astrophys. 644 (2020) Art. No. A123.
A pdf file (CH2OH_rot_2020.pdf) is available in this directory.
This article describes in sufficient detail the considerations
for the fit and the differences with respect to the first entry,
which was based on Ref 2.
The spfit files are available in the directory
background_files.
The initial files associated with version one are in the directory
initial_vers.1.
Additional data were taken from
2) C. Bermudez, S. Bailleux, and J. Cernicharo,
Laboratory detection of the rotational-tunnelling spectrum
of the hydroxymethyl radical, CH2OH,
Astron. Astrophys. 598 (2017) Art. No. A9.