- #1
Moogie
- 168
- 1
Hi
Why does a bond stretch or vibration have to cause a change in dipole moment to be IR active?
Presumably all vibrational modes depend on energy aborption to occur whether they cause a change in dipole or not. I'm presuming that only those vibrational modes that cause a dipole change are in the IR region of the EMR spectrum. Other vibrations absorb energy in some other region of the EMR. Is this correct?
Actually as i was typing this I've just read that the reason why vibrations that cause a change in dipole lead to absorptions in the IR region is due to the mechanism by which the photon transfers its energy to the molecule, which is outside the scope of the article i saw.
Can anyone offer a simple explanation to this?
Kind regards
Why does a bond stretch or vibration have to cause a change in dipole moment to be IR active?
Presumably all vibrational modes depend on energy aborption to occur whether they cause a change in dipole or not. I'm presuming that only those vibrational modes that cause a dipole change are in the IR region of the EMR spectrum. Other vibrations absorb energy in some other region of the EMR. Is this correct?
Actually as i was typing this I've just read that the reason why vibrations that cause a change in dipole lead to absorptions in the IR region is due to the mechanism by which the photon transfers its energy to the molecule, which is outside the scope of the article i saw.
Can anyone offer a simple explanation to this?
Kind regards