✦ LIBER ✦
Connection between the manne—Åberg theorem and a sum rule derived in the framework of the green's-function formalism
✍ Scribed by Dietmar Saddei; Hans-Joachim Freund; Georg Hohlneicher
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 259 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
A sum rule for ionization potentkds. similar to the Marine-Xberg theorem, is derived in the fmmeliork of a many-body Green's_function formaiism_This sum rule is shown to be valid under main& t\o conditions (3 the constant term and the aftiity poks of the seff-energ part tie to be neglected; (ii) the finaI state ux\efunction has to be separabIe in a freeekctron and an (A'-i)-ekctron part. The latter assumption is discussed in connection uith the sudden approximation which is not used for the derivation of the new sum rule.