 Solution

ID: past-exam-of-the-chemistry-a-course-of-the-university-of-cambridge/2025/paper-1/a2/a/solution

The Pauli principle requires the complete wavefunction of identical fermions to be antisymmetric under exchanging the full coordinates, including spin:

Ψ (x_{2}, x_{1}) = - Ψ (x_{1}, x_{2}), x_{i} = (r_{i}, s_{i}) .

It is the total spatial-and-spin state that changes sign; the spatial factor alone need not be antisymmetric.

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