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Assignment of the methanol OH-stretch overtone spectrum using the pattern recognition method.

Alexis Libert1,2, Anthony Roucou1,3, Brian Hays1,4

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We measured the 2OH stretching band of cold methanol (CH3OH) using cavity ring-down spectroscopy. Our enhanced pattern recognition method improved the assignment of rovibrational transitions.

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Area of Science:

  • Molecular Spectroscopy
  • Physical Chemistry
  • Astrophysics

Background:

  • Accurate spectroscopic data for methanol is crucial for atmospheric and astrophysical studies.
  • Previous assignments of methanol's 2OH stretching band were limited.
  • Buffer gas cooling provides a unique environment for high-resolution spectroscopy of cold molecules.

Purpose of the Study:

  • To measure and analyze the 2OH stretching band of cold methanol (CH3OH).
  • To improve the assignment of rovibrational transitions using an enhanced pattern recognition method.
  • To provide high-quality spectroscopic data for methanol.

Main Methods:

  • Cavity ring-down spectroscopy (CRDS) was employed to measure methanol absorption spectra.
  • Methanol was cooled to 26 ± 12 K using a buffer gas cooling technique.
  • An enhanced pattern recognition method, incorporating relative transition intensities, was used for spectral assignment.

Main Results:

  • The 2OH stretching band of methanol was measured between 7165 cm⁻¹ and 7230 cm⁻¹.
  • A total of 350 rovibrational transitions were firmly assigned, and 62 were tentatively assigned.
  • The enhanced assignment method successfully identified 188 additional firm and 14 tentative assignments compared to previous work.

Conclusions:

  • The study successfully measured and analyzed the 2OH stretching band of cold methanol.
  • The improved assignment methodology significantly increased the number of identified rovibrational transitions.
  • The obtained spectroscopic data will enhance the interpretation of astronomical observations and atmospheric models.