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冷靶反冲离子动量成像谱仪的研制及其在气体分子强场物理研究中的应用.docx

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冷靶反冲离子动量成像谱仪的研制及其在气体分子强场物理研究中的应用 Abstract Thedevelopmentofcoldtargetrecoilionmomentumimagingspectrometeranditsapplicationinthestudyofstrongfieldphysicsofgasmoleculeswerereviewed.Theprincipleofrecoilionmomentumimagingspectrometerwasintroduced,includingtheiondetectionprinciple,theimagingprincipleandthecharacteristicsoftheinstrument.Theapplicationsoftherecoilionmomentumimagingspectrometerinthestudyofstrongfieldphysicsofgasmoleculeswerealsodiscussed.Finally,thechallengesinthedevelopmentofrecoilionmomentumimagingspectrometerwerepresented. Introduction Coldtargetrecoilionmomentumimagingspectrometer(COLTRIMS)isapowerfultoolforstudyingthedynamicsofgasmoleculesinstrongfieldphysics.COLTRIMScanprovidethecompletemomentumdistributionofallchargedparticlesproducedinareaction,whichmakesitanexcellenttoolforstudyingthestructureanddynamicsofmolecules.Inthispaper,theprincipleofCOLTRIMSwasintroduced,includingtheiondetectionprinciple,theimagingprincipleandthecharacteristicsoftheinstrument.TheapplicationsofCOLTRIMSinthestudyofstrongfieldphysicsofgasmoleculeswerealsodiscussed.Finally,thechallengesinthedevelopmentofCOLTRIMSwerepresented. PrincipleofCOLTRIMS TheprincipleofCOLTRIMSisbasedonthemomentumconservationduringareactionbetweenamoleculeandaprojectile.Whenamoleculeishitbyaprojectile,itwillundergoaviolentreactionthatproducesmanychargedparticles,includingelectronsandions.Thesechargedparticlesareacceleratedbythestrongfieldspresentinthereactionandwillflyoutindifferentdirectionswithdifferentkineticenergies.ThemomentumdistributionofthesechargedparticlescanbemeasuredbyCOLTRIMS,allowingresearcherstostudythedynamicsofthereaction. TheiondetectionprincipleofCOLTRIMSisbasedontheuseofamicrochannelplate(MCP)detector.MCPdetectorsareusedbecausetheyhavehighspatialresolution,highquantumefficiencyandafastresponsetime.TheMCPdetectorislocatedattheendoftheapparatusandispositionedtocollectionsthattraveltowardit.WhenanionenterstheMCPdetector,itreleaseselectronsthatareamplifiedanddetectedbyaphosphorscreen.Thesp