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1、萬方數據AbstractInthecomplexionsofphysicalresearcharea，interactionoflightandmatterisaneternalsubject．EversincetheexplanationofphotoelectriceffectbyEin·steinadoptingalightquantaview,thissubjecthasdevelopedintoanewstage．EspeciallywiththeinventionofLasersin1960s，whentheintensityoflaserfi
2、eldcontinuouslygrows，leadingtothecomparabilityofelectron—lightinteractionwiththeinnerelectron—coreCoulombinteraction，theoverinvolvedquantumperturbationtheoryinearlyresearchisnotavailableanymore．Undertheinflu-enceofintenselaserlight，suchnonlinear,non·perturbativeprocessesasabovethr
3、esholdionization，high—orderharmonicgenerationandnon—sequentialdou—ble(multiple)ionizationwillbefoundinatoms(molecules)．Newphenomenarequiresofnewtheoreticalmethods，andinvestigationofnewphysicalprocesswillalwaysleadstoanewunderstandingofphysicalrealityandmayhelptheprogressofnewtechn
4、ology．Chapteroneistheintroductorypartofthisthesis．Inthischapter,ashorthistoryofintense—fieldphysicsandreviewoflasersaregiven．Meanwhile，sometypicalprocessesareintroduced．Andtwoexamplesaregiven，showinghowintense—filedphysicscanhelpdiagnosingthesub-atomicelectrondynamics．Chaptertwoan
5、dthreeconcerntheoften—invokedresearchmethodofintense—fieldphysicsatpresent．Themethodsoftime—dependentSchr6dingerequation，strong—fieldapproximation，time—dependentNewton’SequationandKeldyshtheoryareshortlyreviewedinchaptertwo．Amongthese，time—dependentSchrrdingerequationisthemostreli
6、ableandfundamentaltheoreticalmethod．However,duetoitsincapabilityofdisentanglingphysicalprocessandlargenumericalcalculationamount，somekindsofapproximationarealwaysinplace．Keldyshtheoryisimportantinitsmathematicalcontents，andcontributesmuchtOtheearlydevelopmentofintense—fieldarea．In
7、chapterthree，thedetailsofsemi-classicalrescatteringmodelaregiven．Basedonthewidely—acceptedthree—stepscheme，wefirstconstructanensembleofparticlesusingIII萬方數據AbstractquantumtunnelingtheorywhosesubsequentdynamicsisgovernedbyNewton’Sequationofmotion．Thismethodhasitsadvantages，suchasba
8、ckanalysisoftrajectories，andhasit
