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IR Intensities and Physical Properties of Methanol Ices, Including H₂O + CH₃OH

Presentation #220.09 in the session Laboratory Investigations (Poster)

Published onOct 23, 2023
IR Intensities and Physical Properties of Methanol Ices, Including H₂O + CH₃OH

Infrared spectroscopic observations have established the presence of solid methanol (CH3OH) in the interstellar medium and in Solar System ices, but the abundance of frozen CH3OH cannot be deduced without accurate band strengths, optical constants (n, k), and reference spectra. Here, we present recent measurements of the infrared spectra and band strengths for CH3OH in both amorphous and crystalline forms at multiple temperatures, including the bands in the region of 2.27-2.38 μm (4400-4200 cm-1). As we have done in our recent work on CO, benzene, and hydrocarbons, we also report new measurements of the density, index of refraction at 670 nm, and vapor pressures as measured both with a quartz-crystal microbalance and with IR techniques. Direct measurements of band strengths in H2O + CH3OH ices are also reported. Comparisons of all new results to earlier work are presented where possible.

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