Dear all,(adsbygoogle = window.adsbygoogle || []).push({});

I want todirectlycalculate the polarizability using the following perturbation expression,

when the ground state wave function |0> is known.

for example, for He atom, r_{1}and r_{2}two electrons.

##\alpha = \frac{2}{3}\left\langle {0|({r_1} + {r_2})\frac{1}{{H - {E_0}}}({r_1} + {r_2})|0} \right\rangle ##

How to deal with the term of ## \frac{1}{{H - {E_0}}}## ?

Any help or references will be appreciated.

Best regards.

Youzhao Lan

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# How to directly calculate the polarizability

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