Spectroscopic parameters and rest frequencies of isotopic methylidynium, CH+
HSP M�ller�- Astronomy & Astrophysics, 2010 - aanda.org
HSP M�ller
Astronomy & Astrophysics, 2010•aanda.orgContext. Astronomical observations toward Sagittarius B2 (M) as well as other sources with
APEX have recently suggested that the rest frequency of the J= 1–0 transitions of 13 CH+ is
too low by about 80 MHz. Aims. Improved rest frequencies of isotopologs of methylidynium
should be derived to support analyses of spectral recording obtained with the ongoing
Herschel mission or the upcoming SOFIA. Methods. Laboratory electronic spectra of four
isotopologs of CH+ have been subjected to one global least-squares fit. Laboratory data for�…
APEX have recently suggested that the rest frequency of the J= 1–0 transitions of 13 CH+ is
too low by about 80 MHz. Aims. Improved rest frequencies of isotopologs of methylidynium
should be derived to support analyses of spectral recording obtained with the ongoing
Herschel mission or the upcoming SOFIA. Methods. Laboratory electronic spectra of four
isotopologs of CH+ have been subjected to one global least-squares fit. Laboratory data for�…
Context
Astronomical observations toward Sagittarius�B2(M) as well as other sources with APEX have recently suggested that the rest frequency of the J = 1–0 transitions of 13CH+ is too low by about 80�MHz.
Aims
Improved rest frequencies of isotopologs of methylidynium should be derived to support analyses of spectral recording obtained with the ongoing Herschel mission or the upcoming SOFIA.
Methods
Laboratory electronic spectra of four isotopologs of CH+ have been subjected to one global least-squares fit. Laboratory data for the J = 1–0 ground state rotational transitions of CH+, 13CH+, and CD+, which became available during the refereeing process, have been included in the fit as well.
Results
An accurate set of spectroscopic parameters has been obtained together with equilibrium bond lengths and accurate rest frequencies for six CH+ isotopologs: CH+, 13CH+, 13CD+, CD+, 14CH+, and CT+.
Conclusions
The present data will be useful for the analyses of Herschel or SOFIA observations of methylidynium isotopic species.
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