Band
Title
3897.0 cm-1: 3ν4 of 12CH4 in natural CH4 - phase I
Type
absorption
Assignments summary
Assignment Symmetry Mode Specie(s) Molecule/Atom Bond Multiplicity Degeneracy Contribution Resonance
4 deformation 12CH4 CH4 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)
3897 ± 4 - - asymmetric 3.39 ± 0.05 4.237e-04 w 30.0
3900 ± 10 - - high frequency tail 2.1 ± 0.4 w 90.0 0.117
Label
4
Category
overtone vibration

Evaluation

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

Vibration modes

Label (type)
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
strongly blended
Peak
3897 ± 4 cm-1 (peak)
Evaluation
validated
Quality
C
Shape
asymmetric
Evaluation
undefined
Method
peak intensity
Absorption coefficient
3.39 ± 0.05 cm-1
Relative intensity
4.237e-04 ± 6.25e-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
3900 ± 10 cm-1 (other)
Evaluation
validated
Quality
D
Shape
high frequency tail
Evaluation
undefined
Comments
in the wing of the 3847 cm-1 band
Method
extrapolated
Absorption coefficient
2.1 ± 0.4 cm-1
Strength
weak (w)
Evaluation
validated
Quality
D