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Write down a generic molecular Hamiltonian (or, if you want a concrete example, the one for...

Write down a generic molecular Hamiltonian (or, if you want a concrete example, the one for H2). Then using words and equations, show precisely what steps and approximations are made to ultimately come up with the harmonic oscillator Hamiltonian for vibration and the rigid rotator Hamiltonian for rotation of the molecule.

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