Band
Title
7233.0 cm-1: 3ν2+2ν4 of 12CH4 in natural CH4 - phase I
Type
absorption
Assignments summary
Assignment Symmetry Mode Specie(s) Molecule/Atom Bond Multiplicity Degeneracy Contribution Resonance
2+2ν4 combination vibration 12CH4 CH4 12C-1H
12C-1H
unknown
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)
7233 ± 2 - - symmetric 1.83 ± 0.04 2.288e-04 w 30.0
7230 ± 3 - - asymmetric 1.54 ± 0.03 w 90.0 0.117
Label
2+2ν4
Category
combination vibration

Evaluation

Level
fully assigned
Evaluation
validated
# Multiplicity type Degeneracy Other band
1 unknown

Vibration modes

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

Temperature

Temperature
30.0 ± 1.0 K
Formation temperature
90.7 K
Temperature max
90.7 K
Method #1
spectrum measurement
Overlap
moderately blended
Peak
7233 ± 2 cm-1 (peak)
Evaluation
validated
Quality
B
Shape
symmetric
Evaluation
undefined
Method
peak intensity
Absorption coefficient
1.83 ± 0.04 cm-1
Relative intensity
2.288e-04 ± 5.0e-06
Strength
weak (w)
Evaluation
validated
Quality
B
Texture
crystal

Temperature

Temperature
90.0 ± 1.0 K
Formation temperature
90.7 K
Temperature max
90.7 K

Pressure

Pressure
0.117 bar
Comments
Vapor pressure
Method #1
spectrum measurement
Overlap
strongly blended
Peak
7230 ± 3 cm-1 (peak)
Evaluation
validated
Quality
C
Shape
asymmetric
Evaluation
undefined
Method
peak intensity
Absorption coefficient
1.54 ± 0.03 cm-1
Strength
weak (w)
Evaluation
validated
Quality
A