Attosecond pulses qhia cov lus zais ntawm lub sijhawm qeeb

Attosecond pulsesQhia tawm cov lus zais ntawm lub sijhawm qeeb
Cov kws tshawb fawb hauv Tebchaws Meskas, nrog kev pab ntawm Attosecond pulses, tau qhia cov ntaub ntawv tshiab txog covPhotoelectric nyhuv: tusPhotoelectric EugissionNcua yog txog 700 attoseconds, ntau ntev dua li yav tas los tau. Cov kev tshawb fawb tshiab no sib tw cov qauv theeretical uas twb muaj lawm thiab ua rau muaj kev sib cuam tshuam ntawm cov tshuab hluav taws xob xws li cov semiconductors thiab lub hnub ci.
Cov txiaj ntsig yees duab yees duab yees duab yog hais txog qhov tshwm sim uas thaum lub teeb ci ntsa iab rau ntawm cov hlau lossis atom ntawm lub ntsej muag hlau, lub photon sib cuam tshuam nrog malecule lossis atom thiab tso cov electrons. Cov nyhuv no tsis yog tsuas yog ib qho tseem ceeb ntawm quantum mechanics, tab sis kuj tseem muaj kev cuam tshuam zoo heev rau kev txawj ntse niaj hnub, chemistry thiab cov ntaub ntawv txuj ci thiab cov ntaub ntawv tshawb fawb. Txawm li cas los xij, hauv daim teb no, hu ua PhotoMission qeeb tau muaj kev sib cav sib ceg tau piav qhia nws rau lwm qib sib txawv, tab sis tsis muaj kev sib sau ua ke.
Raws li lub teb ntawm attosecond txuj ci tau txhim kho kom zoo dua qub nyob rau hauv xyoo tsis ntev los no muaj txoj hauv kev uas tsis muaj peev xwm tshawb nrhiav lub ntiaj teb me me. Los ntawm ntsuas ntsuas ntsuas qhov tshwm sim ntawm lub sijhawm luv luv teev, cov kws tshawb fawb muaj peev xwm tau txais cov ntaub ntawv ntau ntxiv txog kev coj tus cwj pwm tsis zoo ntxiv. Hauv kev kawm kawg, lawv tau siv ib qho kev siv X-Ray pulses tsim los ntawm cov txheej txheem stanford (squasth), rau ionize cov tseem ceeb electrons thiab "Kov" tawm ntawm qhov zoo siab molecule.
Txhawm rau txheeb xyuas qhov chaw ntawm cov khoom siv hluav taws xob roj hluav taws xob, lawv siv ib tus zuj zusLaser pulsesTxhawm rau ntsuas lub sijhawm nqus dej ntawm cov tshuab hluav taws xob hauv cov lus qhia sib txawv. Cov qauv no tso cai rau lawv kom muaj qhov sib txawv tseem ceeb ntawm cov sijhawm sib txawv los ntawm cov electrons, lees tias qhov kev ncua qeeb tuaj txog 700 attoseconds. Nws yog tsim nyog sau cia tias qhov kev tshawb pom no tsuas yog siv qee cov kev xav dhau los, tab sis kuj tau xaiv cov kev tshawb fawb tshiab, ua rau rov kuaj tshiab thiab kho dua tshiab.
Ib qho ntxiv, kev tshawb pom qhov tseem ceeb ntawm kev ntsuas thiab txhais lub sijhawm qeeb, uas yog qhov tseem ceeb kom nkag siab cov txiaj ntsig sim. Hauv cov protein crystallography, kev kho mob kev ua haujlwm, thiab lwm cov ntaub ntawv tseem ceeb cuam tshuam nrog cov qauv ntawm cov txheej txheem kev ua haujlwm thiab kev txhim kho cov kev xav tau zoo. Yog li ntawd, pab pawg phiaj xwm txuas ntxiv tshawb cov qauv hluav taws xob sib txawv thiab lawv txoj kev sib raug zoo nrog cov qauv molecules, tso cov ntaub ntawv ntau cov ntaub ntawv rau kev txhim kho cov thev naus laus zis yav tom ntej.