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*N*‐Particle Noninteracting Green's Function

### Abstract

A prescription is given for obtaining the Green's function for *N* free particles which can have different masses. The approach is systematic and straightforward. A coordinate transformation of the Fourier integral representation of the *N*‐particle noninteracting Green's function facilitates the integration over 3*N*‐1 angular variables of wavenumber space. A single radial integral can then be evaluated. The resulting Green's function representation may be of use in applying the integral form of Schrödinger's equation to calculate the ground and excited states of atoms.

© 1972 The American Institute of Physics

Received 26 February 1971
Published online 31 October 2003