# scattering theory quantization condition

where and how is found the scattering quatniztion condition

$det (1-zS)= 0$ so the energies or bounded states of scattering come out from this

here $S=S(k)=e^{2i\delta (k)}$ where could i find some info about it ??

wouldn't be easier to impose the condtion on the functional determinant of the Schroedinguer operator $det(E-H)=0$

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