انتقال الکترون میکروسکوپ مزایا
مزایای از انتقال الکترون میکروسکوپ
٪0aScanning transmission electron microscopy was developed in the the 1950s. Instead of light٪2c TEM uses a focused beam of electrons٪2c which is sent through a sample to form an image. The advantage of transmission electron microscopy over light microscopy is that it is able to produce greater magnification that optical microscopes cannot reveal details.
٪ 0aچگونه میکروسکوپ کار می کند
٪0aTransmission electron microscopes work similarly to light microscopes٪2c but instead of light or فوتون٪2c they use beams of electrons. An electron gun is like a light source in an optical microscope٪2c a These focused electrons strike the specimen on the stage and bounce off the specimen٪2c creating x-rays in the process. The returned٪2c or scattered٪2c electrons٪2c as x-rays٪2c are converted into a signal that feeds an image on a tv screen for the scientist٪27s views of the specimen.
٪0aتصادق از انتقال الکترون میکروسکوپی
٪0aمانند از thin sections for optical microscopy and transmission electron microscopy. Interestingly٪2c it magnifies specimens to a greater degree than a light microscope. Magnifications of 10٪2c٪7b٪7b1٪ 14.4.4 پس از خروج از 14شن کریستال ساختار از TEM نمونه فراهم می کند عالی قطعنامه و می تواند حتی اشکار ارایش از اتم در نمونه است.
٪ 0aمقیمیت از انتقال الکترون میکروسکوپ
٪0aTransmission electron microscopy requires the specimen to be in a vacuum chamber. Because of this requirement٪2c the microscope can be used to to observe living samples٪2c such as protozoa. Some delicate samples may also be damaged by the electron beam and must first be be chemically stained or coated to protect them. This treatment sometimes destroys the specimen.
٪0aعدی میکروسکوپ استفاده متمرکز نور برای بزرگنمایی تصویر ٪2c اما انها a built-in physical limit of about 1000x magnification. This limit reached in the the 1930s٪2c but the scientists hope to increase their magnification potential٪2c allowing them to probe the inner workings of cells and other microscopic structures.
