Abstract
Average angles Open image in new window between linear momenta of an electron in a subshell nl and another electron in a subshell n′l′ are examined for the 102 atoms He through Lr in their ground states, where n and l are the principal and azimuthal quantum numbers, respectively. Congruency in the mathematical structures of the average interelectronic angles in position and momentum spaces leads to the theoretical results that Open image in new window with even |l−l′| are exactly equal to 90°, while Open image in new window with odd |l−l′| are always larger than 90°. Numerical analyses of 3,275 subshell-pair angles Open image in new window with odd |l−l′| in the 102 atoms clarify that deviations of the total average interelectronic angles from 90° are mainly governed by subshell pairs with |n−n′|≤1 and |l−l′|=1, in contrast to the position-space results where only subshell pairs with n=n′ and |l−l′|=1 are important.
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