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Version 2021.08.hfs
Tag 31802
Molecule - Descriptor Methylamine, Methanamine (CH3NH2) - v=0
Isotope parent
Hyperfine Yes
Lines in DB 140452
Frequency max. (MHz) 2999616.736
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 93538.290 93538.29 1.0
200.0 50881.290 50881.29 1.0
150.0 33035.760 33035.76 1.0
50.0 6349.680 6349.68 1.0
10.0 566.820 566.82 1.0

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

Format:
J K Sym F

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