where is a constant of integration. We chose to make the
potential continuous at
b) For a single electronbound to a point nucleus, we can use hydrogen wave
functions:
c) The first-order change in the ground state wave energy is
For any physical value ofZ,the parameter is very much smaller than
unity. One can evaluate the above integral as an expansion in and show
that the first term is so the answer is approximately
QUANTUM MECHANICS 291