Band
Title
66930.0 cm-1: A 1Π ← X 1Σ⁺ (2,0) of 12C16O in natural CO - phase alpha
Type
absorption
Assignments summary
Assignment Symmetry Mode Specie(s) Molecule/Atom Bond Multiplicity Degeneracy Contribution Resonance
A 1Π ← X 1Σ⁺ (2,0) Ag intervalence charge transfer 12C16O CO 12C⁻≡ 16O⁺ no extracted
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)
66930 ± 180 67200 ± 45 1010 ± 5 gaussian 1 vvs 1 vvs 8.0
Label
A 1Π ← X 1Σ⁺ (2,0)
Symmetry
Ag
Category
electronic transition
Method
comparison with gas phase

Evaluation

Level
fully assigned
Evaluation
validated
Comments
Fourth positive band system (Cameron system), (ν',ν”) = (2,0)
# Multiplicity type Degeneracy Other band
1 no
Contribution level
extracted
Contribution comments
main component of the 66930cm^{-1} (149.4 nm)absorption band: crystal field splitting (Davidov splitting)
Primary specie
12C16O
Comments
probably degenerated/strongly blended contributions from site A and E

Electronic modes

Label (type)
A 1Π ← X 1Σ⁺ (intervalence charge transfer)

Vibration modes

Label (type)
1 (stretching)       Bond: 12C⁻≡ 16O⁺
Comments
(ν',ν”) = (2,0)

Temperature

Temperature
8.0 ± 1.0 K
Formation temperature
8.0 K
Method #1
spectrum fit: deconvolution of the whole spectrum with 15 gaussians
Fit function
Gaussian: center = 148.8 nm, width = 2.24 nm, area = 3.45 10-17 cm2.nm
Overlap
extracted
Peak
66930 ± 180 cm-1 (peak)
Center
67200 ± 45 cm-1 (fit center)
Evaluation
validated
Quality
E
FWHM
1010 ± 5 cm-1 (fit fwhm)
Shape
gaussian
Evaluation
validated
Quality
E
Method
fit intensity
Relative intensity
1
Strength
very very strong (vvs)
Evaluation
validated
Comments
the strongest VUV band at 67200 cm-1 (148.8 nm)
Method
fit integrated intensity
Relative intensity
1 ± 0.003
Strength
very very strong (vvs)
Evaluation
validated
Quality
A
Comments
intensity relative to the strongest VUV band at 67200 cm-1 (148.8 nm)