[SOLVED] Low Voltage Scanning Electron Microscopy

Write 7 pages with APA style on Low Voltage Scanning Electron Microscopy. Working Principles of Scanning Electron Microscopy (SEM) Scanning electron microscopes (SEMs) are microscopes, which produce sample images by scanning the samples using a beam of focused electrons. The focused beam of electrons interacts with electrons within the sample to produce differing signal strengths that can be detected by a secondary electron detector. The focused electrons hit the sample surface, where they either get reflected as back-scattered electrons (BSE) due to inelastic scattering or cause an emission of electrons from the sample surface as secondary electrons (SE) due to elastic scattering (Lyman, 1990). The SE are emitted from the k-orbitals of the sample once the electrons in the beam hit them in a strong enough way that displaces them from the orbital. Both BSE and SE show different properties of the sample material, which commonly includes composition and topography (Boyes, 2000). The focused beam of electrons is scanned by raster scanning and position of the beam is combined with the signal from the BSE and SE to develop an image. This type of microscopic observation can attain resolutions that are better than a nanometer. The focused beam used in SEM is produced by thermionic means from an electron gun consisting of a cathode made of tungsten. Tungsten is preferable because of its relatively lower vapor pressure and high melting point. Additionally, it is cost-effective because it is relatively cheap. The produced beam passes through two lenses that focus it onto the specimen. The energy of the beam ranges from 0.2 keV to 40 keV depending on the design of the microscope. The focus offers a spot diameter of approximately 0.4 nanometers to 5 nanometers (Joy & Carolyn, 1996). On reaching the final lenses in the column the beam is deflected by a pair of deflecting plates, which deflect it in two planes (X, Y planes) so as to create a raster scan area that is rectangular over the sample’s surface (Asmar et al., 2004). The interaction of beam electrons and the sample make the electrons lose energy through repeated random scattering, which occurs near the surface or much deeper depending on the projection energy in keV. This interaction volume from which energy is released in form of electrons to create the image is known as the interaction volume. The interaction volume is determined by the landing energy of the electrons from the projected beam as well as density and atomic number of the material under observation as the sample. Technically, the differences between HVEM and LVEM are a result of differences in landing energy determined by the electron accelerating voltage. The acquired signals are detected and amplified to develop images. The differences of detected signals are represented by variations in brightness on the visual display. The resultant image is thus a representative of electron energy emitted from the sample’s surface through inelastic and elastic scattering. The Unique Nature of Low voltage scanning electron microscopy (LVSEM) According to Joy and Carolyn (1996), even prior to practical use of scanning electron microscopes, it had been recognized that scanning at low electron accelerating voltage (&lt.5 keV) would improve the process.

 

So much stress and so little time? Take care of yourself: let us help you with your task on
[SOLVED] Low Voltage Scanning Electron Microscopy
Get a 20% Discount on this Paper
Get Help Now

Haven’t found relevant content or pressed for time? –Don’t worry,  you have a team of Physics professionals to help you.

All you need to do is fill in the order form in the upper right corner and upload the files that are crucial for your assignment. Also, don’t forget to specify whether your assignment has to be based upon specific research, theory, method, or program. After that, we will assign the most suitable expert to complete your assignment. You can always chat with your expert and ask any questions you have during the working process.

Calculate the price
Make an order in advance and get the best price
Pages (550 words)
$0.00
*Price with a welcome 15% discount applied.
Pro tip: If you want to save more money and pay the lowest price, you need to set a more extended deadline.
We know how difficult it is to be a student these days. That's why our prices are one of the most affordable on the market, and there are no hidden fees.

Instead, we offer bonuses, discounts, and free services to make your experience outstanding.
Sign up, place your order, and leave the rest to our professional paper writers in less than 2 minutes.
step 1
Upload assignment instructions
Fill out the order form and provide paper details. You can even attach screenshots or add additional instructions later. If something is not clear or missing, the writer will contact you for clarification.
s
Get personalized services with Do My Homeworkk
One writer for all your papers
You can select one writer for all your papers. This option enhances the consistency in the quality of your assignments. Select your preferred writer from the list of writers who have handledf your previous assignments
Same paper from different writers
Are you ordering the same assignment for a friend? You can get the same paper from different writers. The goal is to produce 100% unique and original papers
Copy of sources used
Our homework writers will provide you with copies of sources used on your request. Just add the option when plaing your order
What our partners say about us
Check out the latest reviews and opinions submitted by real customers worldwide and make an informed decision.
Finance
Wow! I should never have doubted you guys. Thank you for the excellent grade
Customer 452443, August 27th, 2021
Business and administrative studies
Thank you so much for your help!!!!!
Customer 452519, November 9th, 2022
Classic English Literature
THANK YOU SO MUCH!!!! :)
Customer 452493, April 19th, 2022
Nursing
Looks good. Thank you!!!
Customer 452503, April 25th, 2022
Chemical Engineering
Amazing. The writer delivered the draft earlier than expected, lol. I am pleased with the work; I hope my supervisor will like it too.
Customer 452443, September 1st, 2021
Other
Thank you!
Customer 452493, May 29th, 2022
Chemistry
Excellent services!
Customer 452443, November 11th, 2021
Other
Thank you! :)
Customer 452493, May 14th, 2022
Economics
Thank you!
Customer 452493, March 16th, 2022
Nursing
Good work, professional and beat the deadline. Thank you so very much
Customer 452445, August 24th, 2021
Nursing
A well-researched paper. Delivered before the deadline as well. Extremely pleased !!
Customer 452445, August 20th, 2021
Education
Awesome work, responded well and clarified everything.. Would definitely recommend, great service
Customer 452445, September 8th, 2021
OUR GIFT TO YOU
15% OFF your first order
Use a coupon FIRST15 and enjoy expert help with any task at the most affordable price.
Claim my 15% OFF Order in Chat

Order your essay today and save 15% with the discount code ESSAYHELP