"Ritz" Analysis of the Fourier Spectrum of 13CH3OH from 25 to 350 cm−1

The 13CH3OH far-infrared laser: new lines and assignments

“…Column 2 reports the pump wavenumber corrected by the offset and, below and in square brackets, the wavenumber of the corresponding absorption transition measured in the FTS spectrum. Column 3 reports the observed wavelength converted in wavenumbers, and column 4 the wavenumber calculated as the difference between the corresponding Ritz energy level values [16,17]. Columns 5, 6 and 7 report the quantum numbers of the levels of the pump lower state, the common upper state, and the lower state of the FIR lasing transition, respectively.…”

Quantum chaotic behavior in vibro-roto-torsional levels of methanol and its isotopomers

“…The spectrum of the CD 3 OH isotopomer, for which the second largest number of energy-level values is available, was measured at a pressure of 50 Pa, with a path length of 284 cm. More experimental details can be found in [15,13,[16][17][18]14].…”

A heuristic approach to automated molecular line assignment

“…In particular, the Ritz program has led to the compilation of databases containing almost 200 000 assigned lines and almost 50 000 term values of six methanol isotopomers and five other molecules. Most of these data have been published recently [2][3][4][5][6]. All computational methods presently used are heavily interactive, and often their performance relies very strongly on the spectroscopistÕs ability, experience, and patience.…”

“…Not surprisingly, the wide availability of computers has led to the development of computer-assisted assignment methods. These methods range from the use of commercial spreadsheets to the development of dedicated software, like Loomis-Wood [1] or Ritz [2][3][4][5][6]. In particular, the Ritz program has led to the compilation of databases containing almost 200 000 assigned lines and almost 50 000 term values of six methanol isotopomers and five other molecules.…”