Homework Statement
Be the vectors a, b, c such as:
| a | = | b | = | c | = 10.5 Angstron
The angles between these vectors are:
alpha = beta = gamma = 109.5 degree
These vectors represent the lattice vectors of a crystal.
Find out their components (a_1, a_2, a_3, b_1...
Homework Statement
We have that for a crystal the lattice parameters (in angstrom and degree) are:
a b c (in Angstrom)
10.5 10.5 10.5
\alpha β γ (in degree)
109.5 109.5 109.5...
Dear Bob,
Thanks a lot for the fast answer.
If I do not bother you too much could I ask you which is the difference between "smooth" and "small" potentials. By smooth potential I would understand something like the potential in a metal (i.e. free electron system). But this is also...
Dear All,
I have recently read about WKB approximation and about perturbation theory.
Both methods are applicable in the range of slowly varying potentials. What I have not understood is which is the range of applicability of one of the method compared with the other one. More...