Band
Title
11846.0 cm-1: ν1+3ν3 of 12CH4 in natural CH4 - phase I
Type
absorption
Assignments summary
Assignment Symmetry Mode Specie(s) Molecule/Atom Bond Multiplicity Degeneracy Contribution Resonance
ν1+3ν3 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)
11846 ± 3 - - asymmetric 0.0111 ± 3.0e-04 1.388e-06 ew 30.0
11850 ± 5 - - undefined 0.009 ± 0.001 ew 90.0 0.117
Label
ν1+3ν3
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
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
11846 ± 3 cm-1 (peak)
Evaluation
validated
Quality
C
Shape
asymmetric
Evaluation
undefined
Method
peak intensity
Absorption coefficient
0.0111 ± 3.0e-04 cm-1
Relative intensity
1.388e-06 ± 3.75e-08
Strength
extremely weak (ew)
Evaluation
validated
Quality
B
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
strongly blended
Peak
11850 ± 5 cm-1 (other)
Evaluation
undefined
Quality
C
Shape
undefined
Evaluation
undefined
Comments
merged with 11875 cm-1 band
Method
peak intensity
Absorption coefficient
0.009 ± 0.001 cm-1
Strength
extremely weak (ew)
Evaluation
undefined
Quality
D