. La-fonction-d, onde V(f,t) s'écrit sous une forrne où on voit apparaître lcs llamiltoniens de l'état initial et de l'état final : Y(r,t)=t-i H' t U

. En-remplaçant, A5) et (I-24\ dans (Al) la probabilité de transition s'écrit : Pi-+r = lltrlslx')l' [f -ioi(* -il.r) * i"i(. -ir.i)lr

. Dans-l, expression de G1 apparaît la dérivée 6. 1 par rapport à x, qui se réduit à la fonction c[ ô (voir Oh et cotl(zt) en faite : ti^ z{n!-= -q

. La-contribution-de-glz-est-négligeu61, (ts) puisque la deuxième partie de l'intégrale comprend le produit de G1r G1z, la fonction ô donne une contribution finie et si on écrit, Êb *85 avec kr))e, et k6))e6 les termes croisés donnent des valeurs proportionnelles à eo et e6 qui sont petits

*. W=ffi#, rz) ar(g) as(a1,E,t) . as(d1

. Dans-le-cas-de-l, ionisation de I'hydrogène dans son état métastable 2s ou du Lithium un terme supplémentaire doit être ajouté dans I'expression de l'intégiale I(X) ce qui nécessite le calcul O" ffidont l'expression est donnée par

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