WM3 (Infrared Spectroscopy) Flashcards
1
Q
describe the bond deformation for simple diatomic molecules
A
they only vibrate in one way (stretching) so there is only one vibrational infrared absorption
2
Q
why are absorption frequencies different for each molecule
A
the energy needed to excite a vibration depends on bond strength
3
Q
when do the strongest infrared absorptions occur
A
when there is a large change in bond polarity associated with the deformation eg O-H, C-O + C=O
4
Q
what does the M/Z value for the M+ ion determine
A
the Mr of the compound analysed
