Band
Title
742.5 cm-1: ν4b (Eu) of (CO3)2- in Siderite
Band type
Type
Raman scattering
Comments
activated infrared mode
Assignments summary
Assignment Symmetry Mode Specie(s) Molecule/Atom Bond Multiplicity Degeneracy Contribution Resonance
ν4b (Eu) Eu deformation in-p (CO3)2- (CO3)2- mode degeneracy double 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)
742.5 ± 0.25 - 19.5 ± 0.75 symmetric 0.017 vw 0.039 w 295.0 1
Band assignment #1
Assignment
Label
ν4b (Eu)
Symmetry
Eu
Category
fundamental vibration

Evaluation

Level
partly assigned
Evaluation
uncertain
Comments
or possible lifting of degeneracy
# Multiplicity type Degeneracy Other band
1 mode degeneracy double (CO3)2-
Contribution level
extracted
Primary specie
(CO3)2-

Vibration modes

Label (type)
ν4b (deformation in-p)       Bond: (CO3)2-
Comments
O-C-O in-plane bdeformation
Composition
Fe>0.95, Mg<0.05, Mn<0.04
Texture
crystal in plot

Temperature

Temperature
295.0 ± 5.0 K

Pressure

Pressure
1 bar
Laser wavelength
532.0 nm
Sample orientation mode
unoriented
Method #1
spectrum fit
Fit function
Gaussian
Overlap
strongly blended
Peak
742.5 ± 0.25 cm-1 (fit peak)
Evaluation
validated
Quality
A
Comments
increases with Mg fraction
FWHM
19.5 ± 0.75 cm-1 (fit fwhm)
Shape
symmetric
Evaluation
validated
Quality
B
Comments
decreases with Mg fraction
Method
fit intensity
Relative intensity
0.017 ± 0.006
Strength
very weak (vw)
Evaluation
validated
Quality
E
Comments
decreases with Mg fraction
Method
width x peak intensity
Relative intensity
0.039 ± 0.013
Strength
weak (w)
Evaluation
recommended
Quality
E
Publication
SSHADE spectrum