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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

Format:
J K Sym

Details: Each level is characterized by the value of the usual quantum numbers J and K = Ka, and by an overall torsion-wagging-rotation symmetry species Γ corresponding to an irreducible representation of the permutation-inversion group G12. To distinguish between two doubly degenerate levels of E1 or E2 symmetry with the same J, K, the notation E1+1 and E1-1, or E2+1 and E2-1 is used, where +1 and -1 levels correspond to k=K>0 and k=-K<0 respectively. When table includes hyperfine levels, standard F = J+I quantum number is added to the labeling. The correspondence between integer Sym number in .cat file and symmetry species Γ is given in the table →

Sym Γ
3 A1
-3 A2
4 B1
-4 B2
1 E1+1
-1 E1-1
2 E2+1
-2 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