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The Quantum Defect Method uses interpolated or extrapolated quantum defects to determine the asymptotic forms of atomic wave functions. The method may be used in the calculation of atomic transition probabilities and photo-ionization cross sections, in electron-ion collision calculations and also in connection with solid state problems. The paper gives a summary of previous work on the fundamental ideas of the method and presents some new results for positive energy states and for the normalization of bound-state wave functions. Some applications of the method are discussed.
M. J. Seaton (Wed,) studied this question.