plik


ÿþ23. Schrödinger s equation for the region x>Lis d2È 8À2m + [E - U0] È =0 . dx2 h2 If È = De2kx, then d2È/dx2 =4k2De2kx =4k2È and d2È 8À2m 8À2m + [E - U0] È =4k2È + [E - U0] È . dx2 h2 h2 This is zero provided À k = 2m (U0 - E) . h The proposed function satisfies Schrödinger s equation provided k has this value. Since U0 is greater than E in the region x >L, the quantity under the radical is positive. This means k is real. If k is positive, however, the proposed function is physically unrealistic. It increases exponentially with x and becomes large without bound. The integral of the probability density over the entire x axis must be unity. This is impossible if È is the proposed function.

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