For the ground state of the Harmonic Oscillator and 2D Rigid Rotor
A. Give the time dependent wave function
B. Determine <x> and <p> for both the Harmonic
Oscillator and 2D Rigid Rotor
(a) Derive a general expression for the energy difference
between any two neighboring rotational state (i.e, the difference
in energy between the L abd L+L states). (b) How does the energy
difference change as L increases? (c) How does the energy
difference change if the radius, r, of the rotating particle
increases?
Show that in a parabolic potential well, the spacing between the
energy levels is constant. In semiconductors, parabolic potential
wells are often produced by using narrow square potential wells
where the well to barrier width ratio gradually changes. Use the
virtual crystal approximation to design a GaAs/AlAs parabolicwell
where the level spacing for the electron is approximately 8meV.
(Hint: This isthe harmonic oscillatorproblem.)
Which one of the following systems has adjacent energy level
spacing that does not change with increasing quantum number?
particle in a one dimensional box
Hydrogen atom
harmonic oscillator
Free rigid rotator
The ionization of the H atom is 13.6 eV, it corresponds to the
energy difference between the ground state n=1 and the energy level
n=:
∞
100
10
1000
1
(i) Derive a generic relationship between the separation of
vibrational energy levels, ΔG, and the vibrational quantum number
for an arbitrary transition from v to v + 1. [3 marks]
(ii) What factors influence the strength of transitions between
two, bound electronic states of a molecule? [3 marks]
(iii) Explain why the rotational constant is different for
different vibrational energy levels. A diagram may be helpful. [3
marks]
(iv) Use a diagram to show differences between the experimental
measurement of...
1-Recall the expression of thermal conductivity.
2-Recall the expression for electron energy levels in One
dimension.
3-Give a comparison between ferromagnetic, antiferromagnetic and
paramagnetic materials.