THE MAIN PHASES OF DEVELOPMENT IN PHOTOEMISSION STUDIES ON LASER-EXCITED ATOMS USING SYNCHROTRON RADIATION

D. CUBAYNES, J. M. BIZAU, F. J. WUILLEUMIER, D. L. EDERER, J. L. PICQUE, B. CARRE, M. FERRAY, F. GOUNAND
1987 Le Journal de Physique Colloques  
L ' u t i l i s a t i o n combinee d ' u n l a s e r a c o l o r a n t c o n t i n u e t du rayonnement synchrotron emis par l'anneau de stockage a e l e c t r o n s ACO ii LURE a permis l e s pre-miPres experiences de spectroscopie d'electronssur des atomes portss dans un @ t a t e x c i t e e t ionises en couche externe e t en couche i n t e r n e . Les premiers @lements etudies o n t e t 6 l e sodium e t l e baryum. Cette nouvelle m6thode a permis de mesurer des forces d ' o s c i l l a t e
more » ... o s c i l l a t e u r e t des sections e f f i c a c e s de p h o t o i o n i s a t i o n dans des atomes e x c i t e s sur un domaine etendu d'energies de photons. Recemment, des e t a t s atomiques t r P s e x c i t e s o n t ete prepargs par l ' a c t i o n simultanee de deux lasers 5 c o l o r a n t continus e t du rayonnement synchrotron d'ACO, e t l e u r a u t o i o n i s a t i o n a St6 Gtudiee. Une revue de ces experiences e s t presentee. Leur extension possible grzce ? I l a mise en s e r v i c e d'onduleurs montes sur des anneaux de stocl:age specialement c o n s t r u i t s pour l a production de rayonnement synchrotron, t e l que Super ACO, e s t discutee. ABSTRACT By combining a cw l a s e r beam w i t h synchrotron r a d i a t i o n e m i t t e d by t h e ACO storage r i n g a t LURE, i n Orsay, we have demonstrated the f e a s i b i l i t y o f such photoionization experiments on e x c i t e d atoms using e l e c t r o n spectrometry and we have obtained the f i r s t photoelectron spectra o f l a s e r -e x c i t e d sodium and barium atoms. The o s c i l l a t o r strengths f o r t r a n s i t i o n s between core-electrons and o p t i c a l o r b i t a l s i n e x c i t e d atoms have been determined and p h o t o i o n i z a t i o n cross sections i n e x c i t e d atoms have been measured over a broad range o f photon energies. More recently, two-electron h i g h l y e x c i t e d a u t o i o n i z i n g s t a t e s have been produced and studied, using stepwise e x c i t a t i o n w i t h two cw dye l a s e r beams t o e x c i t e an o u t e r e l e c t r o n and synchrotron r a d i a t i o n t o e x c i t e an i n n e r e l e c t r o n i n sodium. A review of these experiments extending over a p e r i o d o f serveral years i s given. The extens i o n o f these studies using undulator r a d i a t i o n and new storage r i n g s i s discussed. Article published online by EDP Sciences and available at http://dx.
doi:10.1051/jphyscol:1987974 fatcat:77wboz2myffnxkzg7clzflzbyi