Register to reply

Arrhenius plot and activation energy

by prehisto
Tags: activation, arrhenius, energy, plot
Share this thread:
prehisto
#1
May9-13, 02:02 PM
P: 60
Hi,guys.
I m trying to determine activation energy of donor levels .
So i have measured absorption at different temperatures of my sample (mono-crystal)

And I have plotted ln(optical density) vs 1/T(K).
And I want to calculate activation energy useing
D=D0exp(-Ea/kT)

In plot above (picture) Eactivation should be 0.043eV

The problem is that I cant get the right answer.
Could someone help me,and derive the mentioned formula above for Ea determination? Maybe Im doing it wrong.
Phys.Org News Partner Physics news on Phys.org
A new, tunable device for spintronics
Researchers study gallium to design adjustable electronic components
Gadolinium-based material that can be cooled by varying magnetic field
Useful nucleus
#2
May9-13, 02:49 PM
Useful nucleus's Avatar
P: 261
Hi prehisto,

First the scatter in your data should make a large error bar. What is the 95% confidence range of this fitted activation energy?

Second, I would check things like natural log v.s. decimal log and the units of Boltzmann constant, jsut the basic stuff.
prehisto
#3
May9-13, 04:26 PM
P: 60
I agree, it makes a large error bar. But in this case it does not matter . This is an example for which i know the result ( for this particular liner fitting).

i have checked logarithms and Boltzman const.

Is this the correct formula?


Register to reply

Related Discussions
Arrhenius equation plot Biology, Chemistry & Other Homework 9
Using an Arrhenius plot Chemistry 3
Activation energy Biology, Chemistry & Other Homework 3
Finding Activation Energy From Arrhenius Plot Biology, Chemistry & Other Homework 3
Chemistry: Activation Energy (Arrhenius equation) Biology, Chemistry & Other Homework 2