quantum to classical

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    The way to go from quantum to classical is by taking hbar going to zero. To keep things consistent with classical mechanics then, we need to take in this case spin going to infinity (so that the product of something that looks like hbar*I is finite). Hence we can consider the quantum situation of spin = infinity that will have continuous energy levels. This can also be understood intuitively since spin here corresponds to orientatiens of the nucleus and in classical mechanics we don’t expect these discrete orientations, hence we take spin = infinite to allow for this.

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