Band
Title
7279.0 cm-1: 2ν3+ν4 of 12CH4 in natural CH4 - phase I
Band type
Type
absorption
Assignments summary
Assignment Symmetry Mode Specie(s) Molecule/Atom Bond Multiplicity Degeneracy Contribution Resonance
2ν3+ν4 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)
7279 ± 3 - - asymmetric 2.28 ± 0.05 2.85e-04 w 30.0
7276 ± 5 - - broad shoulder 1.5 ± 0.2 w 90.0 0.117
Band assignment #1
Assignment
Label
2ν3+ν4
Category
combination vibration

Evaluation

Level
fully assigned
Evaluation
validated
# Multiplicity type Degeneracy Other band
1 unknown
Primary specie
12CH4

Vibration modes

Label (type)
2ν3 (stretching asym.)       Bond: ≥ 12C-1H
ν4 (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
strongly blended
Peak
7279 ± 3 cm-1 (peak)
Evaluation
validated
Quality
C
Shape
asymmetric
Evaluation
undefined
Method
peak intensity
Absorption coefficient
2.28 ± 0.05 cm-1
Relative intensity
2.85e-04 ± 6.25e-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
shoulder-tail
Peak
7276 ± 5 cm-1 (other)
Evaluation
undefined
Quality
C
Shape
broad shoulder
Comments
strong shoulder in the wing of the 7305 cm-1 band
Method
extrapolated
Absorption coefficient
1.5 ± 0.2 cm-1
Strength
weak (w)
Evaluation
undefined
Quality
D
Publication
Data publication experiment