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Reference.org
Configuration state function
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<p>In <a href="/facts/Quantum_chemistry/H9AXV0lx">quantum chemistry</a>, a configuration state function (CSF), is a symmetry-adapted linear combination of <a href="/facts/Slater_determinant/oKfv2Av0">Slater determinants</a>. A CSF must not be confused with a <a href="/facts/Electron_configuration/TQjRr22P">configuration</a>. In general, one configuration gives rise to several CSFs; all have the same total quantum numbers for spin and spatial parts but differ in their intermediate couplings. </p>