(a) Determine the average energy (E) of the quantum harmonic oscillator at temperature T or 3 = 1/kT, using the partition function. Express your result using 3 and han- You can check your result using the next item. (b) How is the mean vibrational quantum number (n) related to (E)? Plot the mean number of vibrational quanta (n) versus k„T/hn for k,T/ħao = 0...4. Determine (from your graph) the temperature in units of h where (n) = 1.

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Problem 2.
Energy of the quantum harmonic oscillator
Recall from Homework 5 Problem 1 that the mean energy of a single classical harmonic
oscillator interacting with the thermal environment is
(E) = k„T
(13)
Now we will compare this classical result to the quantum version of the harmonic oscillator.
This builds on Homework 4 Problem 3 and Homework 5 problem 3.
Recall that the energy levels of the oscillator are E, = nhun, where we have shifted what
we call zero energy to be ground state energy n =
%3D
0. while higher vibrational states have
n= 1,2.....
(a) Determine the average energy (E) of the quantum harmonic oscillator at temperature
T or 3 = 1/k T, using the partition function. Express your result using B and hun.
You can check your result using the next item.
%3!
(b) How is the mean vibrational quantum number (n) related to (E)? Plot the mean
number of vibrational quanta (n) versus kT/hn for kT/ha
(from your graph) the temperature in units of hg where (n) = 1.
= 0...4. Determine
%3D
(c) Plot
(E)
(14)
versus k„T/hwo for kaT/h=0...4.
Transcribed Image Text:Problem 2. Energy of the quantum harmonic oscillator Recall from Homework 5 Problem 1 that the mean energy of a single classical harmonic oscillator interacting with the thermal environment is (E) = k„T (13) Now we will compare this classical result to the quantum version of the harmonic oscillator. This builds on Homework 4 Problem 3 and Homework 5 problem 3. Recall that the energy levels of the oscillator are E, = nhun, where we have shifted what we call zero energy to be ground state energy n = %3D 0. while higher vibrational states have n= 1,2..... (a) Determine the average energy (E) of the quantum harmonic oscillator at temperature T or 3 = 1/k T, using the partition function. Express your result using B and hun. You can check your result using the next item. %3! (b) How is the mean vibrational quantum number (n) related to (E)? Plot the mean number of vibrational quanta (n) versus kT/hn for kT/ha (from your graph) the temperature in units of hg where (n) = 1. = 0...4. Determine %3D (c) Plot (E) (14) versus k„T/hwo for kaT/h=0...4.
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