Question

what is perimetric coordinate?​

Answer 1

Pekeris introduced perimetric coordinates to treat the helium atom, a three‐particle system. ... The purpose of this paper is to point out that such coordinates do not exist for systems containing four or more particles.

Answer 2

Answer:

Pekeris introduced perimetric coordinate to treat the helium atom,three particles system. The process of this paper is to point out that such coordinate do not exist for system containing four or more particles