Principle of Scanning Electron Microscopy | SEM

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A scanning electron microscope (SEM) is a type of electron microscope that produces images of a sample by scanning it with a focused beam of electrons. The electrons interact with atoms in the sample, producing various signals that contain information about the sample's surface topography and composition. The electron beam is generally scanned in a raster scan pattern, and the beam's position is combined with the detected signal to produce an image. SEM can achieve resolution better than 1 nanometer. Specimens can be observed in high vacuum, in low vacuum, in wet conditions (in environmental SEM), and at a wide range of cryogenic or elevated temperatures.

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Nice video and explanation, just to remark, I think you said the secondary electrons are the *scattered* ones - they are not scattered, they are ejected from the K-shell by the interaction with the beam electrons (which explains their name secondary)

DrMithrandir

very cool video. When most of us think of electron microscopes, THIS is the type of microscope we are thinking about. Most well known electron microscope images are SEM images. When I think about the electron microscope, I think about Lennart Nilssen; he is the one who really made electron microscopy an art form, and brought it to a wider audience.

EphemeralProductions

The way of presentation was good, but please mention the instrumentation part in next microscopy methods, for eg, parts of TEM and SEM. It'll provide more information on the topic.
Good work!

samruddhishinde

I love the way you explain. You make it easy for me. Have you made a video on turgor pressure?

Happygirl-wxyp

Hussain u r doing really gud work but plzzz increase time duration of ur video for broad explanation

komalpreetkaur

Thanks for the class it is very useful l loved it....

jobyjohn

What if the sample is highly positively charged, then will SEM work?

nooryaseen

Sir Can I get the notes pdf of SEM and TEM

ankushpatrawat

Sir g kindly make the vedio on this topic . "Electron microscope and HAADF stem image."

MuhammadShahid-snhk

sir is there any vedio on oxidative phosphorylation?

bismajan

please any one provide vedio link like this on XRD also please

gadiswamy

ok sir no issue ..

actually im prepaing ma exams n i need that

bismajan

you seriously have to work on your pronounciation.

sebribo

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