Vim li cas qhov kev daws teeb meem ntawm electron microscopes ntau dua li ntawm optical microscopes?
Vim tias cov tshuab hluav taws xob siv hluav taws xob siv cov kab hluav taws xob thiab cov khoom siv kho qhov muag siv cov teeb pom kev zoo, thiab lub wavelength ntawm electron beams luv dua lub wavelength ntawm pom lub teeb, qhov kev daws teeb meem ntawm electron microscopes yog ntau dua li ntawm optical microscopes.
Qhov kev daws teeb meem ntawm lub tshuab tsom iav yog cuam tshuam nrog qhov xwm txheej lub khob hliav qab lub kaum sab xis thiab lub wavelength ntawm lub teeb hluav taws xob dhau los ntawm cov qauv.
Lub wavelength ntawm pom lub teeb yog li 300 mus rau 700 nanometers, thiab lub wavelength ntawm lub electron beam muaj feem xyuam rau lub accelerating voltage. Raws li lub hauv paus ntsiab lus ntawm yoj-particle duality, lub wavelength ntawm high-ceev electrons yog luv dua lub wavelength ntawm pom lub teeb, thiab cov kev daws teeb meem ntawm lub microscope yog txwv los ntawm lub wavelength siv. Yog li ntawd, qhov kev daws teeb meem ntawm electron microscope (0.2 nanometers) yog ntau dua li qhov kev daws teeb meem ntawm optical microscope. (200 nm).
Daim ntawv thov ntawm electron microscopy thev naus laus zis yog ua raws li lub tshuab ntsuas qhov muag. Qhov kev daws teeb meem ntawm lub tshuab tsom iav qhov muag yog {{0}}}.2μm thiab qhov kev daws teeb meem ntawm lub tshuab hluav taws xob xa hluav taws xob yog 0.2nm. Qhov ntawd yog hais tias, qhov kis tau tus mob electron microscope magnifies 1000 lub sij hawm ntawm lub hauv paus ntawm optical microscope. sij hawm.
Txawm hais tias qhov kev daws teeb meem ntawm electron microscopy yog siab dua li ntawm optical microscopy, nws muaj qee qhov tsis zoo:
1. Hauv lub tshuab ntsuas hluav taws xob, cov qauv yuav tsum tau soj ntsuam hauv lub tshuab nqus tsev, yog li tsis tuaj yeem soj ntsuam cov qauv nyob. Nrog rau kev nce qib ntawm thev naus laus zis, ib puag ncig scanning electron microscopy yuav maj mam ua kom pom ncaj qha ntawm cov qauv nyob;
2. Thaum ua cov qauv, cov qauv uas cov qauv tsis yog thawj zaug yuav raug tsim, uas ua rau nws nyuaj rau kev txheeb xyuas cov duab tom qab;
3. Vim muaj lub peev xwm tawg hluav taws xob muaj zog heev, qhov cuam tshuam thib ob yog qhov tshwm sim;
4. Vim tias nws yog ob-dimensional dav hlau projection duab ntawm ib qho khoom peb-dimensional, qee zaum cov duab tsis txawv;
5. Txij li thaum kis tau tus mob electron microscopes tsuas tuaj yeem soj ntsuam cov qauv nyias nyias, cov qauv ntawm cov khoom ntawm cov khoom yuav txawv ntawm cov qauv ntawm sab hauv ntawm cov khoom;
6. Rau cov qauv ultra-nyias (hauv qab 100 nanometers), cov txheej txheem kev npaj cov qauv yog nyuaj thiab nyuaj, thiab cov qauv kev npaj yuav puas;
7. Cov kab hluav taws xob tuaj yeem rhuav tshem cov qauv los ntawm kev sib tsoo thiab cua sov;
8. Tus nqi ntawm kev yuav khoom thiab kev tswj xyuas lub tshuab hluav taws xob hluav taws xob yog qhov siab.
