Vim li cas electron microscope qhov kev daws teeb meem txawv heev los ntawm lub teeb pom kev zoo?
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 cov kab hluav taws xob yog luv dua li qhov pom lub teeb, qhov kev daws teeb meem ntawm electron microscopes yog siab dua li ntawm optical microscopes.
Qhov kev daws teeb meem ntawm lub tshuab tsom xam muaj feem xyuam rau qhov xwm txheej lub khob hliav qab lub kaum sab xis thiab lub wavelength ntawm lub teeb hluav taws xob hla ntawm cov qauv.
Lub wavelength ntawm pom lub teeb yog hais txog {{0}} nanometers, thaum lub wavelength ntawm electron beams muaj feem xyuam rau lub accelerating voltage. Raws li lub hauv paus ntsiab lus ntawm yoj-particle duality, lub wavelength ntawm high-speed electrons yog luv dua li qhov pom lub teeb, thiab qhov kev daws teeb meem ntawm lub tshuab tsom iav yog txwv los ntawm lub wavelength nws siv, yog li qhov kev daws teeb meem ntawm electron microscope (0.2 nanometers) Nws yog qhov siab dua li ntawm lub tshuab ntsuas qhov muag (200nm).
Daim ntawv thov ntawm electron microscope technology yog ua raws li qhov kho qhov muag microscope. Qhov kev daws teeb meem ntawm lub tshuab ntsuas qhov muag yog {{0}}}.2μm, thiab qhov kev daws teeb meem ntawm lub tshuab hluav taws xob xa hluav taws xob yog 0.2nm. Uas yog hais, kis tau tus mob electron microscope yog magnified los ntawm 1000 nyob rau hauv lub hauv paus ntawm lub optical microscope. sij hawm.
Txawm hais tias qhov kev daws teeb meem ntawm lub tshuab ntsuas hluav taws xob yog siab dua li ntawm lub teeb tsom iav, 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 microscope yuav maj mam paub qhov kev soj ntsuam ncaj qha ntawm cov qauv nyob;
2. Thaum ua cov qauv, nws yuav ua tau ib tug qauv uas tus qauv tsis muaj, uas exacerbates qhov nyuaj ntawm kev soj ntsuam cov duab tom qab;
3. Vim muaj zog electron scattering peev xwm, theem nrab diffraction yog ib qho yooj yim 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 microscope tsuas tuaj yeem soj ntsuam cov qauv nyias nyias, nws muaj peev xwm hais tias cov qauv ntawm cov khoom siv txawv ntawm cov qauv hauv cov khoom;
6. Rau cov qauv ultra-nyias (tsawg dua 100 nanometers), cov txheej txheem kev npaj ua qauv yog qhov nyuaj thiab nyuaj, thiab cov qauv kev npaj tau puas lawm;
7. Cov kab hluav taws xob tuaj yeem rhuav tshem cov qauv los ntawm kev sib tsoo thiab cua sov;
8. Kev yuav thiab tu cov nqi ntawm cov tshuab hluav taws xob hluav taws xob yog qhov siab.
