Band
Title
5919.0 cm-1: ν1+ν3 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
ν1+ν3 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)
5919 ± 1 - - symmetric 2.54 ± 0.04 3.175e-04 w 30.0
5918 ± 4 - - shoulder 2.2 ± 0.1 w 90.0 0.117
Band assignment #1
Assignment
Label
ν1+ν3
Category
combination vibration

Evaluation

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

Vibration modes

Label (type)
ν1 (stretching sym.)       Bond: ≥ 12C-1H
ν3 (stretching asym.)       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
5919 ± 1 cm-1 (peak)
Evaluation
validated
Quality
B
Shape
symmetric
Evaluation
undefined
Method
peak intensity
Absorption coefficient
2.54 ± 0.04 cm-1
Relative intensity
3.175e-04 ± 5.0e-06
Strength
weak (w)
Evaluation
validated
Quality
A
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
5918 ± 4 cm-1 (other)
Evaluation
undefined
Quality
C
Shape
shoulder
Evaluation
undefined
Comments
in the low frequency wing of the 5991 cm-1 band
Method
peak intensity
Absorption coefficient
2.2 ± 0.1 cm-1
Strength
weak (w)
Evaluation
validated
Quality
B
Data publication experiment