Band
Title
10081.0 cm-1: ν1+2ν34 of 12CH4 in natural CH4 - phase I
Type
absorption
Assignments summary
Assignment Symmetry Mode Specie(s) Molecule/Atom Bond Multiplicity Degeneracy Contribution Resonance
ν1+2ν34 combination vibration 12CH4 CH4 12C-1H
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)
10081 ± 2 - - asymmetric 0.252 ± 0.005 3.15e-05 vw 30.0
10080 ± 4 - - asymmetric 0.155 ± 0.003 vw 90.0 0.117
Label
ν1+2ν34
Category
combination vibration

Evaluation

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

Vibration modes

Label (type)
ν1 (stretching sym.)       Bond: 12C-1H
3 (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
slightly blended
Peak
10081 ± 2 cm-1 (peak)
Evaluation
validated
Quality
B
Shape
asymmetric
Evaluation
undefined
Method
peak intensity
Absorption coefficient
0.252 ± 0.005 cm-1
Relative intensity
3.15e-05 ± 6.25e-07
Strength
very weak (vw)
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
moderately blended
Peak
10080 ± 4 cm-1 (peak)
Evaluation
validated
Quality
C
Shape
asymmetric
Evaluation
undefined
Comments
another mode around 10015 cm-1 contribute between this band and the 9981 cm-1 band
Method
peak intensity
Absorption coefficient
0.155 ± 0.003 cm-1
Strength
very weak (vw)
Evaluation
validated
Quality
A