Magnification in scanning electron microscope, Physics

Assignment Help:

How is magnification in scanning electron microscope controlled?

Magnification in scanning electron microscope:

Magnification into a SEM (scanning electron microscope) can be controlled over a range of regarding 5 orders of magnitude start from x25 or less to x 250,000 or more. Not like optical and transmission electron microscopes, representation magnification into the SEM (scanning electron microscope) is not a function of the power of the purpose lens. SEMs (scanning electron microscopes) may have objective and condenser lenses, but their purpose is to focus the beam to a spot, and not to illustrate the specimen. Given the electron gun can produce a beam with sufficiently small diameter, a SEM (scanning electron microscope) could in principle work fully without condenser or objective lenses, although this might not be extremely versatile or attain very high resolution. In an SEM, as in scanning probe microscopy, magnification results through the ratio of the dimensions of the raster onto the specimen and the raster onto the display device. Assuming which the display screen has a fixed size, higher magnification results by reducing the size of the raster onto the specimen, and vice versa. Therefore Magnification is controlled through the current supplied to the x,y scanning coils, and not through objective lens power.


Related Discussions:- Magnification in scanning electron microscope

Concave grating, give the theory of concave grating and Rowland mounting

give the theory of concave grating and Rowland mounting

What is neutral points , At the neutral position, magnetic field because of...

At the neutral position, magnetic field because of the bar magnet is just equal and opposite to the horizontal component of earth's magnetic field.

Newtons laws the motorcyclist, Newtons laws The Motorcyclist As per to ...

Newtons laws The Motorcyclist As per to Newton's first law an object which is in motion continues in motion along with the similar speed and within the similar direction unless

What is the velocity of the needle, A record player's needle is 6.5 cm from...

A record player's needle is 6.5 cm from the center of a 45-rpm record. Calculate velocity of the needle?

Inelastic scattering (raman''s effect), Under particular condition, light c...

Under particular condition, light can also suffer inelastic scattering from molecules in which it's wavelength changes.

Magnetic moment of a semi circular magnet, What do you mean by the magnetic...

What do you mean by the magnetic moment of a semi circular magnet of radius ‘r' and pole strength ‘m'

What are paramagnetic substances, a) Spin motion of electrons b) On the ...

a) Spin motion of electrons b) On the basis of spin and orbital motion of electrons c) These are feebly attracted in an external magnetic field i.e., have a tendency to go fr

Jet propulsion is made possible by action and reaction, Jet propulsion is m...

Jet propulsion is made possible by action and reaction Fit a small cardboard stabilizer to the neck of a balloon by means of adhesive tape. Inflate the balloon, and close the m

Pressure, why the blood come out of nose in the top of the mountain region?...

why the blood come out of nose in the top of the mountain region?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd