Methane | SSHADE

Molecule

	Atom	Name	Number
	$C$	Carbon	1
	$H$	Hydrogen	4

Relations

Isotope mixture type

terrestrial abundance

Isotopes

Molecule symmetry

Td

Case

spherical-top

Vibrations number

4

Vibrations

Label	Mode	Bond	Symmetry	Degeneracy	Fundamental frequency	Observed frequency	Harmonic frequency	Activity IR	Activity Raman	Strength	Comments
V1	stretching sym.	$CH_4$	$A_{1}$	no	2917.0		3025.5	inactive	active	ia	Raman: 2917.0 $cm^{-1}$ (gas)
V2	deformation	$CH_4$	$E$	double	1534.0	1533.0	1582.7	inactive	active	m	inactif, but Coriolis interaction with V4 - Raman: 2917.0 $cm^{-1}$ (gas)
V3	stretching	$CH_4$	$F_{2}$	triple	3018.9		3156.8	active	active	vs	Raman: 3019.5 $cm^{-1}$ (gas)
V4	deformation	$CH_4$	$F_{2}$	triple	1306.2		1367.4	active	inactive	vs

Comments

Vibrations of the main isotope:

$^{12}CH_4$ . Harmonic frequencies from Gray and Robiette (1979) - Data from NIST Chemistry WebBook

Publications

Chemical bonds

	Bond	Number
	$\geq C-H$	4