 Jacobi coordinates (source code)

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= Jacobi coordinates
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For particles with masses $m_j$ and positions $r_j$, <Jacobi coordinates> consist of the total <center of mass> and successive relative coordinates $\rho_j=r_{j+1}-(\sum_{l=1}^j m_l r_l)/(\sum_{l=1}^j m_l)$. They separate translation from internal motion and diagonalize the <kinetic energy> with the corresponding reduced masses.

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