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1、萬方數(shù)據(jù)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(shù)據(jù)AbstractquantumtunnelingtheorywhosesubsequentdynamicsisgovernedbyNewton’Sequationofmotion.Thismethodhasitsadvantages,suchasba
8、ckanalysisoftrajectories,andhasit