# Activation energy

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- Created by: boggleme
- Created on: 03-12-14 16:54

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- Activation energy
- average thermal energy per particle = kT
- to change units to eV, divide by the charge on the electron (1.6*10^-19)

- Ratio activation energy/kT is called the magic ratio - when this ratio is between 15 and 30, reactions occur and bonds break
- any higher than this and nothing happens
- any lower than this and the bonds have already broken

- Processes...
- a change of state
- thermionic emision (electrons being released from the surface of a conductor when it is heated)
- conduction in a semiconfuctor
- viscous flow (heating a liquid so parkinetic enegy is increased

- each time particles collide, there is a chance the one of them with gain extra energy
- f is the fraction of particles with extra energy E and if E is big compared to kT, then f will be small
- fraction of particles with extra energy 2E = f*f and so the fraction of particles with extra energy xE is f^x.

- f is the fraction of particles with extra energy E and if E is big compared to kT, then f will be small
- there is a huge number of particles colliding billions of times a second so the small fraction of particles gaining energy still adds up to a large number of particles

- average thermal energy per particle = kT

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