Suppose I have a Schrodinger equation for two interacting particles located at x and y; so, something like(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

\left( i \frac{\partial}{\partial t} + \frac{1}{2m_x} \frac{\partial^2}{\partial x^2} + \frac{1}{2m_y} \frac{\partial^2}{\partial y^2} + V(x-y) \right) \psi(x,y,t) = 0.

[/tex]

Now, I want to shift to center of mass coordinates R and r and write the Hamiltonian in terms of them. The resulting Schrodinger equation looks something like

[tex]

\left( i \frac{\partial}{\partial t} + H(R,r) \right) \varphi(R,r,t) = 0.

[/tex]

Question: is it true that

[tex]

\psi(x,y,t) = \varphi \left(\frac{m_x x + m_y y}{m_x + m_y},x-y,t\right)?

[/tex]

If so, why? I have been trying to prove this but have so far just been going around in circles it seems...

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# Changing variables in the Schrodinger equation

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