Version 2021.08.hfs
Tag 32802
Molecule - Descriptor Methylamine, Methanamine (13CH3NH2) - v=0
Isotope 13C
Hyperfine Yes
Lines in DB 82178
Frequency max. (MHz) 1499946.6019
J max. 50
Cite these data as Motiyenko R.A., Margulès L., Ilyushin V.V., Smirnov I.A., Alekseev E.A., Halfen D.T., Ziurys L.M. 2016, A&A, 587, A152

T(K) Qt Qrot Qvib
300.0 95725.950 95725.95 1.0
200.0 52070.610 52070.61 1.0
150.0 33807.510 33807.51 1.0
50.0 6497.430 6497.43 1.0
10.0 579.720 579.72 1.0

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

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
Dipole moments

The dipole moments of the 12C species were used in the calculations

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