An electron can 'tunnel' between potential wells that form a chain, so its state vector can be written
|phi
angle = sum_{-infty}^{+infty} a_n |n
angle,
where |n
angle is the state of being in the n^{th} well, where n increases from left (n < 0) to right (n > 0).
Let
a_n = frac{1}{sqrt{2}} left( frac{-i}{3}
ight)^{|n|/2} e^{inpi}.
(a) What is the probability of finding the electron in the n^{th} well?
(b) What is the probability of finding the electron in well n = 0 or anywhere to the right of it?