Note on four-particle wave functions.
Dougall's expansion is used in the expression for the volume element in tetrahedral coordinates, thereby lifting the spherical triangle restriction on the angles at the tetrahedral vertex. Application is made to the evaluation of matrix elements for the ground state of three-electron atoms.
Pekeris
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CL
Department of Applied Mathematics, The Weizmann Institute, Rehovot, Israel.
Frankowski
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K