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Version 2026.02
Tag 61802
Molecule - Descriptor Methyl Formate (H13COOCH3) - 13C1 : vt=0, 1
Isotope 13C
Hyperfine N/A
Lines in DB 54401
Frequency max. (MHz) 1450476.204
J max. 60
Cite these data as Carvajal M., Kleiner I., Demaison J. 2010, ApJS, 190, 315 https://doi.org/10.1088/0067-0049/190/2/315
Predictions Partition Function Quantum Numbers Format References

T(K) Qt Qrot Qvib
300.0 252230.470 252230.47 1.0
225.0 105303.230 105303.23 1.0
150.0 36879.420 36879.42 1.0
75.0 9003.310 9003.31 1.0
37.5 2920.560 2920.56 1.0
18.75 1027.710 1027.71 1.0
9.375 364.760 364.76 1.0

Energy levels of an asymmetric top with a single internal rotor of C3v symmetry

Code:
BELGI-Cs
Output Format:
J Ka Kc m

Details: Each energy level is characterized by the asymmetric-top quantum numbers J, Ka, and Kc, together with the free-rotor quantum number m. When table includes hyperfine levels, the standard quantum number F = J + I is included in the level designation.

The correspondence between the m quantum number used in the .cat file and the vibrational–torsional quantum number vt, as well as the associated symmetry species Γ = A or E of the C3v point group, is summarized in the table below.

m 0 1 -3 -2 3 4 -6 -5 6 7
vt 0 0 1 1 2 2 3 3 4 4
Γ A E A E A E A E A E
Measurements

  • Willaert F., Møllendal H., Alekseev E., Carvajal M., Kleiner I., Demaison J. 2006, J. Mol. Struct., 795, 4–8
  • Maeda A., Medvedev I.R., De Lucia F.C., Herbst E., Groner P. 2008, ApJS, 175, 138
Dipole moments