Band
Title
770.5 cm-1: 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
ν5 Bu bending sym. out-p (wagging) C2H2 C2H2 -C ≡ C-H no
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)
771 ± 0.5 - - undefined 19600 ± 300 0.25 vs 20.0
770.5 ± 1.5 - - undefined 19550 ± 300 0.252 vs 65.0
Band assignment #1
Assignment
Label
ν5
Symmetry
Bu
Category
fundamental vibration

Evaluation

Level
partly assigned
Evaluation
validated
Comments
B1u, B2u or B3u
# Multiplicity type Degeneracy Other band
1 no
Primary specie
C2H2

Vibration modes

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

Temperature

Temperature
20.0 ± 10.0 K
Temperature max
70.0 K
Method #1
spectrum measurement
Overlap
strongly blended
Peak
771 ± 0.5 cm-1 (peak)
Evaluation
validated
Quality
A
Shape
undefined
Evaluation
undefined
Quality
undefined
Method
baseline corrected peak intensity
Absorption coefficient
19600 ± 300 cm-1
Relative intensity
0.25 ± 0.004
Strength
very strong (vs)
Evaluation
undefined
Quality
A
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
770.5 ± 1.5 cm-1 (peak)
Evaluation
validated
Quality
B
Shape
undefined
Evaluation
undefined
Quality
undefined
Method
baseline corrected peak intensity
Absorption coefficient
19550 ± 300 cm-1
Relative intensity
0.252 ± 0.004
Strength
very strong (vs)
Evaluation
undefined
Quality
A
Method
width x peak intensity
Evaluation
validated
Quality
undefined
Publications