Video: Dab tsi ntawm magnification yuav ua tiav los ntawm lub teeb vs electron microscopes?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev xa tawm scanning electron microscope muaj ua tiav zoo dua 50 teev kev daws teeb meem hauv annular dark-field imaging hom thiab magnifications txog li 10,000,000 × whereas feem ntau lub teeb microscopes yog txwv los ntawm diffraction mus txog 200 nm daws teeb meem thiab muaj txiaj ntsig magnifications hauv qab 2000 ×.
Xav txog qhov no, qhov txawv ntawm qhov magnification thiab kev daws teeb meem ntawm electron thiab lub teeb microscopes yog dab tsi?
Yog peb saib hauv qab a lub teeb microscope ntawm qhov siab tshaj magnification , peb ua tau paub qhov txawv ntawm cov khoom uas tsawg tshaj li ib micrometer (ib txhiab ntawm ib millimeter) sib nrug. Electron microscopes muaj ntau dua daws lub zog - lub zog tshaj tso cai rau peb paub qhov txawv tus kheej atoms.
Tom qab, lo lus nug yog, dab tsi yog qhov siab tshaj plaws magnification uas feem ntau tuaj yeem ua tiav los ntawm electron microscope? Kev daws teeb meem txwv ntawm electron microscopes yog 0,2nm siab kawg pab tau magnification ib electron microscope tau muab yog txog 1,000,000x.
Tsis tas li ntawd, dab tsi muaj qhov ua kom pom tseeb dua ntawm electron microscope lossis lub teeb microscope?
Electron microscopes muaj ntau dua magnifying hwj chim tshaj optical microscopes vim yog siv luv luv wavelength electrons . Lawv tso cai magnifications txog li ib lab npaug ntawm qhov loj ntawm cov qauv thaum kho qhov muag microscopes tuaj yeem ua tiav ib magnification ntawm no ntau dua tshaj 1000x.
Dab tsi yog qhov kev daws teeb meem zoo tshaj plaws uas tuaj yeem ua tiav nrog lub teeb tsom iav?
Lub hom phiaj roj immersion muab qhov siab tshaj plaws theoretical daws lub zog ntawm microscope , tus lej aperture ntawm 1.25 thiab xiav-ntsuab teeb yog 0.2m. Lub ci- teb microscope tau paub qhov txawv ntawm ob lub dots kwv yees li 0.2 Μm sib nrug (qhov loj tib yam li cov kab mob me me).
Pom zoo:
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