Table 4: List of detected and/or expected infrared absorption features.
Wavelength (${\mu }$ m) Mode Note
3.28 C- H aromatic stretch. a
3.38 ${\rm CH}_3$ aliphatic asymmetric stretch.  
3.42 ${\rm CH}_2$ aliphatic asymmetric stretch.  
3.48 ${\rm CH}_3$ aliphatic symmetric stretch.  
3.5 ${\rm CH}_2$ aliphatic symmetric stretch.  
5.87 C= O ketone stretch.  
6.2 C= C aromatic stretch.  
6.85 ${\rm CH}_2$ aliphatic chain like deform. vibration b
7.25 ${\rm CH}_3$ aliphatic symmetric bending deform.  
9.7 ${\rm SiO}$ silicates stretch. c
a Possible contribution from =CH stretch, mode; b principal more intense component, as less intense CH3 asymmetric deformations occur in this range; c exact position depend on the silicate type.

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