Arguments for the powers used in the Lennard Jones Potential


by grep6
Tags: arguments, jones, lennard, potential, powers
grep6
grep6 is offline
#1
Jan15-13, 04:30 PM
P: 5
Can anyone offer an explanation for the powers (6 and 12) used in the Lennard Jones potential? (other than simply saying weak attractive and strong repulsion forces)

I am especially looking for short derivation that can be used to argue that the attractive potential falls off with the sixth power of interatomic distance.

Also, I understand that the repulsive part is used as a convenient way to mimic an exponential. How do we go from the Pauli exclusion principle to an exponential barrier?

Thanks
Phys.Org News Partner Physics news on Phys.org
Researchers develop scalable methods for manufacturing metamaterials
Researchers find tin selenide shows promise for efficiently converting waste heat into electrical energy
After 13 years, progress in pitch-drop experiment (w/ video)

Register to reply

Related Discussions
Lennard-Jones Potential/Force between two atoms Advanced Physics Homework 0
Lennard Jones Potential Advanced Physics Homework 0
Lennard-Jones potential for 3 atoms Atomic, Solid State, Comp. Physics 0
Lennard-Jones Potential Advanced Physics Homework 3