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Version 2021.08.nohf
Tag 31801
Molecule - Descriptor Methylamine, Methanamine (CH3NH2) - v=0
Isotope parent
Hyperfine No
Lines in DB 46233
Frequency max. (MHz) 2999616.2275
J max. 50
Cite these data as Motiyenko R.A., Ilyushin V.V., Drouin B.J., Yu S., Margulès L. 2014, A&A, 563, A137 https://doi.org/10.1051/0004-6361/201323190
Predictions Partition Function Quantum Numbers Format References

T(K) Qt Qrot Qvib
300.0 31179.430 31179.43 1.0
200.0 16960.430 16960.43 1.0
150.0 11011.920 11011.92 1.0
50.0 2116.560 2116.56 1.0
10.0 188.940 188.94 1.0

Methylamine vibration-rotation-tunneling energy levels in the Ohashi-Hougen formalism

Code:
Ohashi-Ilyushin code for methylamine
Output Format:
J K Sym

Details: Each energy level is characterized by the quantum numbers J and K = Ka, together with the overall torsion–wagging–rotation symmetry species Γ, corresponding to an irreducible representation of the permutation–inversion group G12. To distinguish between the two components of doubly degenerate levels of E1 or E2 symmetry with identical J and K values, the labels E1+1 and E1−1, or E2+1 and E2−1 are employed, where the +1 and −1 components correspond to k = +K and k = −K, respectively. When table includes hyperfine levels, the standard quantum number F = J + I is included in the level designation.

The correspondence between the integer symmetry identifier Sym used in the .cat file and the symmetry species Γ is summarized in the table below.

Sym 3 -3 4 -4 1 -1 2 -2
Γ A1 A2 B1 B2 E1+1 E1-1 E2+1 E2-1
Previously published reference data

  • Predicted spectra up to 500 GHz: Ilyushin V., Lovas F.J. 2007, J. Phys. Chem. Ref. Data, 36, 1141–1276
Measurements

  • Ilyushin V.V., Alekseev E.A., Dyubko S.F., Motiyenko R.A., Hougen J.T. 2005, J. Mol. Spec., 229, 170–187
  • Lide Jr D.R. 1954, J. Chem. Phys., 22, 1613–1614
  • Shimoda K., Nishikawa T., Itoh T. 1954, J. Phys. Soc. Jpn., 9, 974–991
  • Hirakawa H., Miyahara A., Shimoda K. 1956, J. Phys. Soc. Jpn., 11, 334–335
  • Nishikawa T. 1957, J. Phys. Soc. Jpn., 12, 668–680
  • Takagi K., Kojima T. 1971, J. Phys. Soc. Jpn., 30, 1145–1157
  • Takagi K., Kojima T. 1973, ApJ, 181, L91
  • Ohashi N., Takagi K., Hougen J.T., Olson W.B., Lafferty W.J. 1987, J. Mol. Spec., 126, 443–459
  • Krȩglewski M., Wlodarczak G. 1992, J. Mol. Spec., 156, 383–389
  • Krȩglewski M., Stahl W., Grabow J.-U., Wlodarczak G. 1992, Chem. Phys. Lett., 196, 155–158
Dipole moments

  • Lide Jr D.R. 1957, J. Chem. Phys., 27, 343–352
  • Takagi K., Kojima T. 1971, J. Phys. Soc. Jpn., 30, 1145–1157