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Solid state physics
lectures
Commits
5ab12ad8
Commit
5ab12ad8
authored
5 years ago
by
Bowy La Riviere
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Tried to fix the numbered list. Manually inserted the numbered list, so it should work now
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!80
Added file with the solutions to the exercises of lecture 6: bonds and...
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#29288
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5 years ago
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src/6_bonds_and_spectra_solutions.md
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5ab12ad8
...
...
@@ -2,13 +2,8 @@
### Exercise 1: linear triatomic molecule
1.
In 1D, there are two normal modes and in 3D there are 4 normal modes
2.
$$
1.
In 1D, there are two normal modes and in 3D there are 4 normal modes
2.
$$
\b
egin{cases}
m
\d
dot{x}_1 & = -
\k
appa(x_1-x_2)
\\
M
\d
dot{x}_2 & = -
\k
appa(2x_2-x_1-x_3)
\\
...
...
@@ -16,38 +11,29 @@ $$
\e
nd{cases}
$$
Where $m$ is the mass of the oxygen atoms and $M$ the mass of the carbon atom.
3.
$$
3.
$$
\o
mega =
\f
rac{
\k
appa}{m}
$$
4.
$$
\f
rac{x_1}{x_2} =
\f
rac{M}{2m}
$$
5.
$$
5.
$$
\o
mega =
\s
qrt{
\f
rac{
\k
appa(2m+M)}{mM}}
$$
### Exercise 2: Lennard-Jones potential
1.
See lecture slides/internet
2.
The equilibrium position is $r_0 = 2^{1/6}
\s
igma$. The energy at the inter atomic distance $r_0$ is given by:
### Exercise 2: Lennard-Jones potential
1.
See lecture+internet
2.
The equilibrium position is $r_0 = 2^{1/6}
\s
igma$. The energy at the inter atomic distance $r_0$ is given by:
$$
U(r_0) = -
\e
psilon
$$
3.
$$
3.
$$
U(r) = -
\e
psilon +
\f
rac{
\k
appa}{2}(r-r_0)^2
$$
Where $
\k
appa =
\f
rac{72
\e
psilon}{2^{1/3}
\s
igma^2}$
4.
The ground state energy is given by
4.
The ground state energy is given by
$$
E_0 = -
\e
psilon+
\f
rac{1}{2}
\s
qrt{
\f
rac{2
\k
appa}{m}}
$$
...
...
@@ -55,8 +41,7 @@ And the breaking energy is given by
$$
E_{break} =
\e
psilon -
\f
rac{1}{2}
\s
qrt{
\f
rac{2
\k
appa}{m}}
$$
5.
Distance from which $U(r)$ becomes anharmonic:
5.
Distance from which $U(r)$ becomes anharmonic:
$$
r_{anharmonic} =
\f
rac{6}{7}2^{1/6}
\s
igma
$$
...
...
@@ -65,6 +50,7 @@ $$
n =
\f
rac{36}{49}
\f
rac{
\e
psilon}{
\h
bar
\o
mega}-
\f
rac{1}{2}
$$
### Exercise 3: Numerical simulation
1.
...
...
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