Band
Title
4686.0 cm-1: ν1+ν4+ν5 of C2H2 in C2H2 - phase II
Band type
Type
absorption
Assignments summary
Assignment Symmetry Mode Specie(s) Molecule/Atom Bond Multiplicity Degeneracy Contribution Resonance
ν1+ν4+ν5 unknown combination vibration C2H2 C2H2 ≥ C-H
 -C ≡ C-H
 C2H2 		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)
4686 ± 1.5 - - asymmetric 7 ± 2 9.0e-05 w 20.0
4686 ± 1.5 - - asymmetric 7 ± 2 9.0e-05 w 65.0
Band assignment #1
Assignment
Label
ν1+ν4+ν5
Symmetry
unknown
Category
combination vibration

Evaluation

Level
partly assigned
Evaluation
uncertain
Comments
Hudson et al. 2014
# Multiplicity type Degeneracy Other band
1 unknown
Primary specie
C2H2

Vibration modes

Label (type)
ν1 (stretching sym.)       Bond: ≥ C-H
ν4 (bending asym.)       Bond: -C ≡ C-H
ν5 (bending sym. out-p (wagging))       Bond: C2H2
Texture
film

Temperature

Temperature
20.0 ± 10.0 K
Temperature max
70.0 K
Method #1
spectrum measurement
Overlap
slightly blended
Peak
4686 ± 1.5 cm-1 (peak)
Evaluation
undefined
Quality
B
Shape
asymmetric
Evaluation
undefined
Quality
undefined
Method
baseline corrected peak intensity
Absorption coefficient
7 ± 2 cm-1
Relative intensity
9.0e-05 ± 3.0e-05
Strength
weak (w)
Evaluation
undefined
Quality
E
Method
width x peak intensity
Evaluation
undefined
Quality
undefined
Texture
film

Temperature

Temperature
65.0 ± 10.0 K
Temperature max
70.0 K
Method #1
spectrum measurement
Overlap
slightly blended
Peak
4686 ± 1.5 cm-1 (peak)
Evaluation
undefined
Quality
B
Shape
asymmetric
Evaluation
undefined
Quality
undefined
Method
baseline corrected peak intensity
Absorption coefficient
7 ± 2 cm-1
Relative intensity
9.0e-05 ± 3.0e-05
Strength
weak (w)
Evaluation
undefined
Quality
E
Method
width x peak intensity
Evaluation
undefined
Quality
undefined
Publication