Band
Title
5990.0 cm-1: 2ν3 of 12CH4 in natural CH4 - phase I
Type
absorption
Assignments summary
Assignment Symmetry Mode Specie(s) Molecule/Atom Bond Multiplicity Degeneracy Contribution Resonance
3 stretching asym. 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)
5990 ± 1 - - symmetric 27 ± 0.5 0.00337 m 30.0
5991 ± 2 - - asymmetric 14.7 ± 0.3 m 90.0 0.117
Label
3
Category
overtone vibration

Evaluation

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

Vibration modes

Label (type)
3 (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
slightly blended
Peak
5990 ± 1 cm-1 (peak)
Evaluation
validated
Quality
B
Shape
symmetric
Evaluation
undefined
Method
peak intensity
Absorption coefficient
27 ± 0.5 cm-1
Relative intensity
0.00337 ± 6.25e-05
Strength
medium (m)
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
5991 ± 2 cm-1 (peak)
Evaluation
validated
Quality
B
Shape
asymmetric
Evaluation
undefined
Method
peak intensity
Absorption coefficient
14.7 ± 0.3 cm-1
Strength
medium (m)
Evaluation
validated
Quality
B