Molecular Vibrations: Energy Absorption By GHG's Flashcards
1
Q
In order to absorb light, what must a molecule have?
A
A dipole moment
2
Q
What is a symmetric stretch?
A
When molecules on either side of the central atom have equal pull in the opposite direction
- these molecules can’t absorb IR light
3
Q
What’s an antisymetric stretch?
A
When the 2 atoms on either side of the central atom are pulling in the same direction
- these molecules can absorb IR
4
Q
Can’t diatomic molecules have a dipole moment?
A
No.
They have a dipole moment = 0
5
Q
Can molecules with 3 or more atoms absorb light?
A
Yes, generally they have some vibration that absorbs IR
6
Q
What are the 2 types of molecular vibrations?
A
- Bond stretching
2. Bending vibration
