Multiphoton Ionization of Atoms

s tepwise process v i a s i n g l y charged ions . T h i s depends on t h e l a s e r i n t e n s i t y and t h e photon energy. The b a s i c i n t e r a c t i o n processes i n v o l v e d a r e cons ide rab l y more compl ica ted than f o r one-e lec t ron atoms. A new theoret i c a l model has t o be developed t o t ake i n t o account e l e c t r o n c o r r e l a t i o n e f f e c t s . F i n a l l y , t h e l a s t p a r t o f t h e p resen t paper w i l l g i v e a b r i e f d e s c r i p t i o n o f t h e c o m p e t i t i o n which occurs a t h i g h a tomic d e n s i t y between resonant m u l t i p h o t o n i o n i z a t i o n and gene ra t i on o f odd harmonics o f t h e l a s e r r a d i a t i o n .