Hyperfine structure of the ground state of orthohelium in the nonrelativistic approximation

The hyperfine structure of orthohelium is studied using an approximate representation of the actual situation obtained by supposing that 1/r1, 1/r2, and 1/r/sub 1,2/ may be replaced by finite functions of each of the three quantities r1, r2, and r/sub 1,2/. The motion of two electrons about an infinitely heavy nucleus may be treated by introducing the distances r/sub i/ and the angle between the direction in which the electron lie. In this way the wave function is obtained in the octant x > y. The problem is then solved numerically. Some results are given which are obtained in late 1967 and again in June 1972. 1 reference