Band
Title
1538.0 cm-1: ν2 of 12CH4 in CH4 - phase I
Type
Raman scattering
Assignments summary
Assignment Symmetry Mode Specie(s) Molecule/Atom Bond Multiplicity Degeneracy Contribution Resonance
ν2 deformation 12CH4 CH4 12C-1H mode degeneracy double
Characteristics summary
Peak position
(cm-1)
Center position
(cm-1)
Width
(cm-1)
Shape Asymmetry factor Peak intensity
(cm-1)
Peak intensity relative Peak strength Integrated intensity
(cm-2)
Integrated intensity relative Integrated strength Temperature
(K)
Pressure
(bar)
1538 ± 4 - 30 ± 2 symmetric m m 77.0
Label
ν2
Category
fundamental vibration

Evaluation

Level
fully assigned
Evaluation
validated
# Multiplicity type Degeneracy Other band
1 mode degeneracy double

Vibration modes

Label (type)
ν2 (deformation)       Bond: 12C-1H
Texture
crystal

Temperature

Temperature
77.0 ± 1.0 K
Formation temperature
90.7 K
Temperature max
90.7 K
Sample orientation mode
unoriented
Polarization orientation mode
depolarized
Comments
Hg lines
Method #1
spectrum measurement
Method #2
spectrum measurement
Overlap
isolated
Peak
1538 ± 4 cm-1 (peak)
Evaluation
validated
Quality
C
FWHM
30 ± 2 cm-1 (fwhm)
Shape
symmetric
Evaluation
undefined
Quality
D
Method
extrapolated
Strength
medium (m)
Evaluation
validated
Quality
undefined
Method
extrapolated
Strength
medium (m)
Quality
undefined