Read e-book online Atomic structure theory: lectures on atomic physics PDF

By Walter R. Johnson

ISBN-10: 3540680101

ISBN-13: 9783540680109

Atomic constitution idea is a textbook for college kids with a heritage in quantum mechanics. The textual content is designed to provide hands-on adventure with atomic constitution calculations. fabric lined contains angular momentum tools, the valuable box Schrödinger and Dirac equations, Hartree-Fock and Dirac-Hartree-Fock equations, multiplet constitution, hyperfine constitution, the isotope shift, dipole and multipole transitions, uncomplicated many-body perturbation conception, configuration interplay, and correlation corrections to matrix parts. Numerical tools for fixing the Schrödinger and Dirac eigenvalue difficulties and the (Dirac)-Hartree-Fock equations are given to boot. B-spline foundation units are used to hold out sums bobbing up in higher-order many-body calculations. Illustrative difficulties are supplied, including ideas. FORTRAN courses imposing the numerical tools within the textual content are included.

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Hydrogenic Coulomb wave functions for states with n = 1, 2 and 3. 30) Z 4 [3n2 − ( + 1)] , + 3/2)( + 1)( + 1/2) ( − 1/2) > 0. 32) Jn+l,2l+1 where, for σ ≥ 0, (σ) Jλ,µ = (−1)σ λ! σ! (λ − µ)! 3 Numerical Solution to the Radial Equation 35 and for σ = −(s + 1) ≤ −1, s (σ) Jλ,µ λ! = (−1)s−γ (λ − µ)! (s + 1)! 34), a b = s γ λ−µ+γ s µ+s−γ s+1 . a! (b − a)! b! 35) designates the binomial coefficient. 3 Numerical Solution to the Radial Equation Since analytical solutions to the radial Schr¨ odinger equation are known for only a few central potentials, such as the Coulomb potential or the harmonic oscillator potential, it is necessary to resort to numerical methods to obtain solutions in practical cases.

3, we compare the observed sodium energy level with values calculated using the two potentials. It is seen that the calculated and observed levels agree to within a few percent for both potentials, although Vb leads to better agreement. The electron-electron interaction potential for the two cases is shown in Fig. 3. , where the n = 3 and n = 4 wave functions have their maxima. ) Fig. 3. 4072 chosen to fit the first four sodium energy levels. Since the two potentials are quite different for small r, it is possible to decide which of the two is more reasonable by comparing predictions of levels that have their maximum amplitudes at small r with experiment.

3. Use the routine insch to obtain the values of the wave function at the last k points on the grid, and continue the inward solution to ac using the routine adams. 4. Multiply the wave function and its derivative obtained in step 3 by a scale factor chosen to make the wave function for r < ac from step 2, and that for r > ac from step 3, continuous at r = ac . If the energy guessed in step 1 happened to be an energy eigenvalue, then not only the solution, but also its derivative, would be continuous at r = ac .

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Atomic structure theory: lectures on atomic physics by Walter R. Johnson

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