Far-infrared Intensity Measurements of Methanol

Details Far-infrared Intensity Measurements of Methanol Far-infrared Intensity Measurements of Methanol

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460013b&link_type=abstract

American Astronomical Society, AAS Meeting #214, #600.13

Astronomy and Astrophysics

Astronomy

Scientific paper

Line intensities of methanol (CH3OH) are generally derived using the dipole moments determined from Stark effect measurements. However, the rotational intensities typically do not account for the torsional dependence of the dipole moment, and are thus incomplete. This effect may be significant in some transitions and can lead to confusion in interpreting observational data. Given the expectations associated with modern observation facilities such as Herschel, ALMA and SOFIA, and the ubiquity of methanol in interstellar gas, precise knowledge of the methanol spectrum is critical. Furthermore, methanol has been used as a calibration gas for the Herschel HIFI instrument and precision intensity data facilitates calibration of the relative sideband gain and local oscillator mixer standing wave patterns.
Because the torsional dependence of the dipole moment cannot be accurately calculated, it must be extracted from line intensity measurements. In this work, an empirical database of methanol line intensities from 300 to 500 cm-1 has been compiled from far-infrared measurements recorded on the Bruker IFS 125 HR Fourier transform spectrometer located at the Jet Propulsion Laboratory. This room temperature spectrum was taken at resolutions between 0.0014 and 0.0050 cm-1 using a 20.26 cm glass cell with wedged high-density polyethylene windows, and detected with a He-cooled bolometer. The results from this study will support the analyses of astronomical observations taken from orbit by the Herschel HIFI instrument.

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