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

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