Ethylene | SSHADE

Molecule

	Atom	Name	Number
	$C$	Carbon	2
	$H$	Hydrogen	4

Relations

Molecule symmetry

D2h

Case

nonlinear-polyatomic

Vibrations number

12

Vibrations

Label	Mode	Bond	Symmetry	Degeneracy	Fundamental frequency	Observed frequency	Activity IR	Activity Raman	Strength	Comments
V1	stretching sym.	$>C<H_2$	$A$	no	3026.0		inactive	active	ia	Raman: 3026.4 $cm^{-1}$
V2	stretching	$>C=C<$	$A$	no	1623.0		inactive	active	ia	Fermi resonance with $2\nu_10$ - Raman: 1622.6 $cm^{-1}$
V3	bending sym. in-p (scissoring)	$>C<H_2$	$A$	no	1342.0		inactive	active	ia	Raman: 1342.2 $cm^{-1}$
V4	bending asym. out-p (twisting)	$>C<H_2$	$A$	no	1023.0		inactive	inactive	ia	Frequency estimated from $\nu_4+\nu_6$
V5	stretching asym.	$>C<H_2$	$B_{1}$	no	3103.0		inactive	active	ia	Raman: 3102.5 $cm^{-1}$
V6	bending asym. in-p (rocking)	$>C<H_2$	$B_{1}$	no	1236.0		inactive	active	ia	Raman: 1236 $cm^{-1}$
V7	bending sym. out-p (wagging)	$>C<H_2$	$B_{1}$	no	949.0	949.3	active	inactive	m
V8	bending sym. out-p (wagging)	$>C<H_2$	$B_{2}$	no	943.0		inactive	active	ia	Raman: 943 $cm^{-1}$
V9	stretching asym.	$>C<H_2$	$B_{2}$	no	3106.0	3105.5	active	inactive	s
V10	bending asym. in-p (rocking)	$>C<H_2$	$B_{2}$	no	826.0	826.0	active	inactive	w
V11	stretching sym.	$>C<H_2$	$B_{3}$	no	2989.0	2988.66	active	inactive	s
V12	bending sym. in-p (scissoring)	$>C<H_2$	$B_{3}$	no	1444.0	1443.5	active	inactive	s

Comments

Vibrations of the main isotope:

$^{12}C_2H_4$ . Data from NIST Chemistry WebBook

Publications

Chemical functions

	Function	Number
	$R=CH_2$	2

Chemical bonds

	Bond	Number
	$\eqslantgtr C-H$	4
	$>C=C<$	1