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On the number of spin functions in the first order interaction space |
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| Authors: | Włodzisław Duch |
| Institution: | (1) Institut für Astrophysik, Max-Planck-Institute für Physik und Astrophysik, Karl-Schwarzschild-Strasse 1, D-8046 Garching bei München, Germany;(2) Present address: Instytut Fizyki Uniwersytetu Miko aja Kopernika, ul. Grudziadzka 5, 87100 Toru , Poland |
| Abstract: | A proof is given that in a configuration interaction method the first-order interaction space contains at most only twice as many spin functions as the zeroth-order space. This allows for a dramatic reduction of the size of CI expansion. For most of the high-spin systems only two spin functions for each configuration are needed. |
| Keywords: | Configuration interaction method configuration selection high-spin systems |
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