The wavefunction of a nitrene diradical : comp_chem

Hello again!

I am calculating a reaction pathway that involves diradical intermediates. One of the intermediates is a nitrene diradical, and at the CASSCF level it is described by a single determinant with the these two singly-occupied orbitals:
imgur.com/C0eC7F6

What is the difference between such a diradical wavefunction and a singlet wavefunction in which both electrons are in the same orbital? The orbitals are very similar except that the phase on the C5O fragment is reversed – what does this mean physically?

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