2. Rectangular corral. In the rectangular corral of Fig. 39-13, fitting an electron
wave to the corral’s widths Lx and Ly requires the two quantum numbers nx
and ny. Thus, any electron confined to the trap must have certain values for
those two quantum numbers, and its quantum number ms can be either or
; so now there are three quantum numbers.According to the Pauli exclusion
principle, two electrons confined to the trap must have different values for at
least one of those three quantum numbers.