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Starting from a set of Slater-type atomic orbitals with seven s-, four p-, one d- and one f-type functions the total wavefunction is constructed by a C I-calculation. The highest degree of the secular equation is 84 for Li ( 2 S) and 142 for Li -  ( 1 S). By diagonalizing the first-order density matrices approximate natural orbitals are obtained. These are analysed and used again in a further C I-calculation. The best values for the electron-affinity are 0.572 eV and 0.614 eV. For the latter value only the correlaton energy of the L-shell of Li -  is considered

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Genäherte natürliche Orbitale für die Grundzustände von Li und Li - ; Elektronenaffinität von Li -  / Approximate natural orbitals for the groundstates of li and li - ; electron-affinity of li -