Band
Title
2720.0 cm-1: ν2+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
ν2+ν5 unknown combination C2H2 C2H2 -C≡ C-
 -C ≡ C-H 		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)
2718 ± 2 - - undefined 25 ± 5 3.2e-04 w 20.0
2720 ± 2 - - undefined 25 ± 5 3.2e-04 w 65.0
Band assignment #1
Assignment
Label
ν2+ν5
Symmetry
unknown
Category
combination

Evaluation

Level
partly assigned
Evaluation
with caution
Comments
Bottger & Eggers 1964
# Multiplicity type Degeneracy Other band
1 unknown
Primary specie
C2H2

Vibration modes

Label (type)
ν2 (stretching)       Bond: -C≡ C-
ν5 (bending sym. out-p (wagging))       Bond: -C ≡ C-H
Texture
film

Temperature

Temperature
20.0 ± 10.0 K
Temperature max
70.0 K
Method #1
spectrum measurement
Overlap
strongly blended
Peak
2718 ± 2 cm-1 (peak)
Evaluation
validated
Quality
B
Shape
undefined
Evaluation
undefined
Quality
undefined
Method
baseline corrected peak intensity
Absorption coefficient
25 ± 5 cm-1
Relative intensity
3.2e-04 ± 6.0e-05
Strength
weak (w)
Evaluation
undefined
Quality
D
Method
width x peak intensity
Evaluation
validated
Quality
undefined
Texture
film

Temperature

Temperature
65.0 ± 10.0 K
Temperature max
70.0 K
Method #1
spectrum measurement
Overlap
strongly blended
Peak
2720 ± 2 cm-1 (peak)
Evaluation
validated
Quality
B
Shape
undefined
Evaluation
undefined
Quality
undefined
Method
baseline corrected peak intensity
Absorption coefficient
25 ± 5 cm-1
Relative intensity
3.2e-04 ± 6.0e-05
Strength
weak (w)
Evaluation
undefined
Quality
D
Method
width x peak intensity
Evaluation
validated
Quality
undefined
Publication