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Unformatted text preview: Chemistry 550 / 475 Homework Assignment #10 due: Friday, December 9th at 5:00 pm Readings : Chapters 10 and 11 in Levine Problem 1  Perturbative treatment of Helium. Compute the electronic groundstate energy of the Helium atom up to firstorder in perturbation theory where the electron electron repulsion, e 2 /  x 1 x 2  , is taken as the perturbation Hamiltonian. You may find the following expansion 1  x 1 x 2  = summationdisplay lm 4 2 l + 1 r l < r l +1 > Y lm ( 1 , 1 ) Y lm ( 2 , 2 ) useful in your calculations. Here, r < ( r > ) are the lesser (greater) of  x 1  = r 1 and  x 2  = r 2 and the sum runs over the usual bounds for l and m . How does your energy compare to the observed value of 79 . 01 eV? Problem 2  More on Helium. [550 only] Problem 9.12 in Levine. In working this problem note that the (arbitrary) choice of unperturbed Hamiltonian H (and, consequently, perturbation Hamiltonian H = H H ) affects the numerical values obtained for the perturbative approximations to the energy and wave function at every order in perturbation theory. Problem 3  Anharmonic oscillator. Problem 9.10 in Levine. Problem 4  Energy variance. [550 only] Given a complete set of states { n } labeled by n we may expand an arbitrary function sharing the same boundary conditions as  ) = 1  ) = parenleftBig summationdisplay n  n )( n  parenrightBig  ) = summationdisplay n  n )( n  ) , where the expansion coefficients ( n  ) are the projections of onto the basis { n } ....
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This note was uploaded on 01/18/2012 for the course CHEM 550/475 taught by Professor Davidj.masiello during the Fall '11 term at University of Washington.
 Fall '11
 DavidJ.Masiello
 Electron

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