An Exact Second-Order Theory and its Application to Electron-Hydrogen Excitation

摘要: Recent technological advances have produced increasingly detailed experimental measurements. These results often revealed problems associated with the standard first-order perturbation series theoretical approaches. For several scattering problems, it is becoming evident that a good second-order theory needed. However, calculations of amplitudes typically resort to simplifying approximations make calculation tractable. A new approach developed which reduces exact evaluation amplitude tractable form. The utility method demonstrated through practical distorted-wave for electron excitation 2p state hydrogen. this case, are in significantly better agreement data than results.