Polarizability of a single hydrogen atom

Cranky
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Homework Statement



the problem text is attached

Homework Equations





The Attempt at a Solution



I have solved Schrödingen equation, while getting
psi(x)=c1*cos(kx)+c2*sin(kx), where k=sqrt(2Em)/hbar
I cannot understand which boundary conditions I schould use.
 

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Bump; is the approach to use perturbation theory with the Stark effect?
 
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