Tsis ntev los no, Xiao-Jun Liu pab pawg tshawb fawb ntawm Lub Tsev Haujlwm Saib Xyuas Kev Ntsuas Kev Ntsuas (IPM) tau ua tiav qhov tseem ceeb hauv kev ua haujlwm ntawm attosecond physics. Pab neeg no tau npaj ib lub tswv yim tshiab hu ua "polarization gate attosecond", uas paub txog qhov kev tshawb pom ultrafast ntawm electron correlation dynamics nyob rau hauv muaj zog laser-driven atomic ionization. Cov txiaj ntsig tau luam tawm hauv Physical Review Letters, ib phau ntawv xov xwm physics thawj coj, thiab xaiv los ua Tus Kws Tshaj Lij Lus Qhia.
Kev nthuav tawm cov cai ntawm hluav taws xob hluav taws xob nyob rau hauv qhov teeb meem ntawm lub sij hawm attosecond yog lub hauv paus tseem ceeb rau kev lees paub thiab nkag siab txog ntau cov txheej txheem photophysical thiab photochemical nyob rau hauv qhov xwm txheej. Vim li no, 2023 Nobel Prize hauv Physics tau muab tsub rau peb tus kws tshawb fawb uas tau ua haujlwm zoo rau kev tshawb fawb hauv thaj tsam ntawm attosecond physics. Ntawm cov txheej txheem spectroscopic ntau rau kev ntsuas attosecond, attosecond angular streak txheej txheem (tseem hu ua "attosecond") muaj cov txheej txheem tshwj xeeb ntawm kev sojntsuam attosecond hluav taws xob dynamical txheej txheem vim tias nws tus kheej-referencing cov cuab yeej - attosecond lub sij hawm daws teeb meem tuaj yeem ua tiav los ntawm kev siv femtosecond laser. pulses tsis siv lub teeb attosecond pulses. Lub "attosecond" muab ib qho tshwj xeeb txhais tau tias los soj ntsuam tob rau hauv cov txheej txheem ntawm attosecond electronics. Cov txheej txheem "attosecond" tau ua tiav rau kev ntsuas ntawm lub sijhawm muaj zog electron tunneling, ob-electron ionization lub sij hawm ncua nyob rau hauv sequential double ionization, thiab lwm yam. Txawm li cas los xij, cov txheej txheem "attosecond" tsis tuaj yeem siv ncaj qha rau cov txheej txheem ntawm lub cev. xws li electron-electron correlation, vim elliptical polarized optical mem tes siv. -electron correlation thiab lwm yam txheej txheem ntawm lub cev.
Txhawm rau kom kov yeej qhov teeb meem no, Xiaojun Liu pab pawg tshawb fawb tau tshaj tawm txoj haujlwm "attosecond" raws li "polarization rooj vag" laser pulses, thiab ua tiav nws mus rau lub sijhawm tshawb pom ntawm electron-electron correlation dynamics nyob rau hauv lub zog-tsav atomic ob chav ionization. txheej txheem. Real-time nrhiav pom ntawm electron-electron correlation dynamics nyob rau hauv muaj zog-field atomic ob ionization. Raws li yav tas los tsim thiab tsim cov cab kuj-lub hnab ntawv theem-stabilized femtosecond laser system, pab pawg neeg tshawb fawb tau ua tiav "polarization rooj vag" ultrashort optical pulses los ntawm kev tswj lub sij hawm ncua thiab cov cab kuj-lub hnab ntawv theem ntawm ob kab ntawm sab laug-tso thiab txoj cai- rotation ncig-polarized femtosecond laser pulses, realizing lub elliptical polarization ntawm lub laser pulses nyob rau hauv lub attosecond lub sij hawm raug thiab meej tswj. Lub laser pulse elliptical polarization xeev yog precisely controllable nyob rau hauv attosecond lub sij hawm precision. Piv nrog rau ib qho elliptical polarized optical pulse feem ntau siv nyob rau hauv lub tshuab attosecond dhau los, "polarization rooj vag" ultrashort mem tes tsis tuaj yeem tsuas yog npaj cov electron correlation xeev thiab tsav lub electron correlation emission nyob rau hauv lub polarization cheeb tsam nyob ze ntawm nws qhov chaw, tab sis kuj khaws cia lub electron correlation xeev. feature ntawm high precision sampling ntawm electron emission lub sij hawm nyob rau hauv attosecond angular kab txaij. Pab neeg tshawb fawb tau siv lub argon atom muaj zog-tawm los ua piv txwv lub sij hawm electron emission. Pab neeg tshawb fawb tau ua tiav qhov "polarization gate attosecond" cov txheej txheem los ntawm kev kawm txog kev sib raug zoo ntawm electron emission lub sij hawm sib txawv ntawm ob lub xeev zoo siab uas tau tsim los ntawm cov txheej txheem muaj zog-thib ob ionization ntawm argon atoms ua piv txwv. Txoj kev tshawb no qhia tau hais tias ionization ntawm ob qho kev cuam tshuam electrons nyob rau hauv lub xeev siab dua ob npaug yog ua los ntawm ob txoj kev sib txawv, thiab "polarization rooj vag thib ob" txheej txheem ntsuas qhov sib txawv ntawm lub sij hawm ionization ntawm ob qho kev cuam tshuam electrons sib xws rau cov kab sib txawv, uas yog 234 (± 22) arsec thiab 1043 (± 73) arsec, feem.
