Band
Title
12719.0 cm-1: 3ν3+3ν4 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
3ν3+3ν4 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)
12719 ± 3 - - asymmetric 0.0135 ± 2.5e-04 1.687e-06 vvw 30.0
12723 ± 5 - - asymmetric 0.0085 ± 2.0e-04 ew 90.0 0.117
Band assignment #1
Assignment
Label
3ν3+3ν4
Category
combination vibration

Evaluation

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

Vibration modes

Label (type)
3ν3 (stretching asym.)       Bond: ≥ 12C-1H
3ν4 (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
moderately blended
Peak
12719 ± 3 cm-1 (peak)
Evaluation
validated
Quality
C
Shape
asymmetric
Evaluation
undefined
Method
peak intensity
Absorption coefficient
0.0135 ± 2.5e-04 cm-1
Relative intensity
1.687e-06 ± 3.125e-08
Strength
very very weak (vvw)
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
12723 ± 5 cm-1 (peak)
Evaluation
validated
Quality
C
Shape
asymmetric
Evaluation
undefined
Method
peak intensity
Absorption coefficient
0.0085 ± 2.0e-04 cm-1
Strength
extremely weak (ew)
Evaluation
validated
Quality
B
Publication
Data publication experiment