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

Find the resistance of copper wire , The specific resistance of copper is 1...

The specific resistance of copper is 1.7ohm. find the resistance of copper wire of length 10m and diameter 1mm. solution) R=ρ*l/A so ou have ρ,l and r(radius). you can use the f

Inductors, Inductors are the electronic components designed especially for ...

Inductors are the electronic components designed especially for introducing a required amount of inductance in the circuit. They are coils of wires, wound around some magnetic mate

The acceleration of a falling ball, The acceleration of a falling ball ...

The acceleration of a falling ball The change in speed per second of a moving body is called the acceleration. When it is constant as in the case of a ball falling under the ac

Farad, farad; F (after M. Faraday, 1791-1867) The derived SI unit of c...

farad; F (after M. Faraday, 1791-1867) The derived SI unit of capacitance, described as the capacitance into a capacitor that, if charged to 1 C, contain a potential differenc

Grammer usage mechanics, Which word in the sentence is the participle? A...

Which word in the sentence is the participle? Around the year 1500, Leonardo da Vinci, a great inventor and painter, designed plans for a flying machine, but it was never built.

Total internal reflection, Total Internal Reflection: When a ray of li...

Total Internal Reflection: When a ray of light passes from denser medium to rare medium and angle of incidence is greater than the critical angle. The incident ray reflects ba

Charging an electroscope by induction balloon, Charging an Electroscope by ...

Charging an Electroscope by Induction Using a Negatively Charged Balloon One general expression performed along with the electroscope includes the induction procedures of charg

Pressure, a drawing pin is pushed against a wooden table with force of 10N....

a drawing pin is pushed against a wooden table with force of 10N. calculate the pressure exerted by the pin at a point on table if area of point is 0.01m square

Explain about electric field, Explain about Electric Field Electric Fie...

Explain about Electric Field Electric Field:  Field formed by a single or group of charges that permeates all space.  Fields are responsible for making forces at a distance

Rectifier, Ask question #Minimum 25 pages accepted#

Ask question #Minimum 25 pages accepted#

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