- #1
skrat
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Homework Statement
Electron in Hydrogen atom can be described with wavefunction ##\psi =\frac{1}{2}(\psi _1+\psi _2+\psi _3+\psi _4)## where ##\psi _1=\psi _{200}##, ##\psi _2=\frac{1}{\sqrt{2}}(\psi _{211}+\psi _{21-1})##, ##\psi _3=\frac{i}{\sqrt{2}}(\psi _{211}-\psi _{21-1})## and ##\psi _4=\psi _{210}##.
Wavefunctions ##\psi _{nlm}## are all normalized. Calculate the ##<l^2>## and ##<l_z^2##.
Homework Equations
##\psi _{200}=\frac{1}{4\sqrt{2\pi }r_B^{3/2}}(2-\frac{r}{r_B})e^{-\frac{r}{2r_B}}##
##\psi _{210}=\frac{1}{4\sqrt{2\pi }r_B^{5/2}}re^{-\frac{r}{2r_B}}cos\vartheta ##
##\psi _{21\pm 1}=\frac{1}{8\sqrt{2\pi }r_B^{5/2}}re^{-\frac{r}{2r_B}}sin\vartheta e^{\pm i\varphi }##
operator ##\hat{l}^2=-\hbar ^2(\frac{\partial^2 }{\partial \vartheta ^2}+ctg\vartheta \frac{\partial }{\partial \vartheta }+\frac{1}{sin^2\vartheta }\frac{\partial^2 }{\partial \varphi ^2})##
and
##\hat{l}_z^2=-\hbar ^2\frac{\partial^2 }{\partial \varphi ^2}##
The Attempt at a Solution
I don't know... I am really blind or is there no other way than actually doing all the integrals? :/
If possible, please answer this question first, before I start writing all the equations on forum.
I tried calculating everything and got ##<\hat{l}^2>=\frac{5}{4}\hbar ^2## which I guess is the right result... Or maybe it is wrong by factor 1/2, or maybe even worse..
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