Harmonic Oscillator & Schrodinger

In summary, the two references present different equations for the normalized harmonic oscillator wavefunction, with the main difference being in the constants before the Hermite function. Reference 1 defines y as sqrt(m*omega/hbar)*x, while reference 2 defines y as sqrt(alpha)*x, where alpha = (m*omega)/hbar and omega can be either sqrt(k/m) or 2*pi*(frequency?). The reason for this difference is not clear and it is uncertain if the two definitions of omega are equal.
  • #1
bluestar
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I wish to graph a couple of the waveforms of a harmonic oscillator. I have consulted several resources and have found two that I like but the final equation differs even though they are both labeled normalized harmonic oscillator wavefunction.

The first reference explains how the harmonic oscillator function is determined and the harmonic equation is at the very bottom of this 3 page document.
http://physchem.ox.ac.uk/~hill/tutorials/qm2_tutorial/sho_series.pdf

The second reference only presents the harmonic equation after a very brief discussion and it too is at the bottom of a 1 page display.
http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/hosc2.html#c1

The difference is the first term after the equate which is: (alpha/pi)^1/4.
This term does not appear in the first reference but does appear in the second.

Also the constants just before the Hermite function differ.


Does anybody know why there is a difference between these two equations and how the difference occured?
 
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  • #2
Their definitions of y are slightly different, this is where you are getting confused.
 
  • #3
It would appear the definitions of y are the same; however, omega differs.

Reference 1 defines y as

y = sqrt(m*omega/hbar)*x where omega = sqrt(k/m)
This is at equation (2)

The reference 2 defines y as:

y = sqrt(alpha)*x where alpha = (m*omega)/hbar and omega = sqrt(k/m) OR omega = 2pi
This definition occurs just above the harmonic equation at the bottom of the page and omega definition at the top of the page.

I can not tell which definition for omega was used. I suspect that since pi occurs in the final form that omega was defined as 2pi * (frequency?).

Thus are the two omegas equal? Gut feeling thinks not.
sqrt(k/m) = 2*pi*(frequency?)
 

1. What is a Harmonic Oscillator?

A Harmonic Oscillator is a type of physical system in which the restoring force is directly proportional to the displacement from equilibrium. This results in a periodic motion of the system, similar to a pendulum swinging back and forth.

2. How is a Harmonic Oscillator described mathematically?

A Harmonic Oscillator can be described mathematically using Hooke's Law, which states that the force applied to a spring is directly proportional to the displacement of the spring from its equilibrium position. This can be expressed as F = -kx, where F is the force, k is the spring constant, and x is the displacement.

3. What is the significance of the Schrodinger equation in the study of Harmonic Oscillators?

The Schrodinger equation is a fundamental equation in quantum mechanics that describes the behavior of a quantum system, including Harmonic Oscillators. It allows us to calculate the probability of finding a particle in a certain location or state, which is essential for understanding the behavior of Harmonic Oscillators at the quantum level.

4. What are the energy levels of a Harmonic Oscillator described by?

The energy levels of a Harmonic Oscillator are described by the quantum number n, where n = 0, 1, 2, ... Each energy level corresponds to a different state of the Harmonic Oscillator, with the lowest energy level (n=0) being the ground state and the higher energy levels (n=1,2,...) being excited states.

5. How does the probability distribution of a Harmonic Oscillator change as the energy level increases?

As the energy level of a Harmonic Oscillator increases, the probability distribution shifts towards higher displacements from the equilibrium position. This means that the higher the energy level, the more likely the particle is to be found at a larger distance from the equilibrium point, corresponding to a more excited state of the oscillator.

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