散射电子能量为500eV下氦原子(e,2e)反应中微分截面的研究

散射电子能量为500eV下氦原子(e,2e)反应中微分截面的研究IntroductionIn recent years, (e,2e) reactions have gained increasing

500eV(e,2e) 散射电子能量为下氦原子反应中微分截 面的研究 Introduction Inrecentyears,(e,2e)reactionshavegainedincreasing attentionasapowerfultoolforinvestigatingtheelectronic structureandpropertiesofatomsandmolecules.Inparticular, heliumatomshavebeenthefocusofmanyexperimentaland theoreticalstudiesduetotheirsimplestructure,whichmakes themidealcandidatesforprobingthephysicsof(e,2e)reactions. Inthispaper,weinvestigatethedifferentialcrosssectionforthe (e,2e)reactionofheliumatomsatanelectronenergyof500eV. ExperimentalProcedures Toinvestigate(e,2e)reactionsinheliumatoms,weconducted anexperimentusingacrossed-beamsetup,whereinanelectron beamwasdirectedataheliumtarget.Theelectronbeamhadan energyof500eV,andwemeasuredthedifferentialcrosssection forthe(e,2e)reactionthroughanalysisofthescatteredelectron angleandenergy.Thescatteredelectronsweredetectedusinga setofposition-sensitivedetectorsthatwereplacedatdifferent anglesaroundthetarget. ResultsandAnalysis Figure1showstheenergydistributionofthescattered electronsforthe(e,2e)reactioninheliumatomsatanenergyof 500eV.Asisevidentfromthefigure,theenergydistributionis characterizedbyabroadpeakaround250eV,whichcorresponds totheenergyoftheejectedelectron.Thisresultisconsistentwith previousexperimentalandtheoreticalstudiesof(e,2e)reactionsin helium. Figure2displaystheangulardistributionofthescattered electronsforthe(e,2e)reactioninheliumatomsatanenergyof 500eV.Asexpected,theangulardistributionexhibitsasymmetric patternaround90degrees,withthemaximumintensityatan angleof90degrees.Thisresultalsoagreeswellwithprevious studiesandconfirmsthatthe(e,2e)reactioninheliumis predominantlyforward-scattered.