Glad Påsk! It was quite informative video. Could you suggest any reading material for TEM?
7 лет назад+2
Williams-Carter is the default, www.springer.com/us/book/9780387765006 Came in a new version for some years ago. Other book I like if you are more into materials is Fultz-Howe www.springer.com/us/book/9783540738862
Thanks. I have got my hands on William-Carter and it's a really nice book. I work in the area of catalysis and hydrodeoxygenation (HDO) at Chalmers. I was wondering if you know any book more focussed in catalysis area.
Why scanning electron microscope have less resolution than Transmission electron microscope in spite of both use electrons to create an image?
10 лет назад+3
-A short answer, for SEM, the resolution is determined mainly by the beam spot-size and it's hard to make a small spot. For TEM, the resolution limit is determined by the optics of the system, i.e the errors in the lenses and finally limited by diffraction phenomena, this is sort of similar as for light microscopes.
Thank you. One question more please, SEM is 3D and TEM is 2D image. Would they type of image effect the resolution?
10 лет назад+2
Zoo Zee Not sure about what you really mean here, but for SEM the data of the image is sort of based on an signal average from a small bulk region of the sample were the electron beam hits, so in that way you lessen the resolution, for TEM the samples can be extreamly thin, down to single atomic layers, so from that aspect I guess you can say TEM performs better.
I thought the different in resolution is caused by mathematical calculation Like ( 3D image is the product of 3 dimensional multiplication and 2D is the product of 2 Dimensional multiplication)so when u multiply by 3 numbers you will get higher number than multiplying by2) 0.01x10x10=1 this is 3D image and 0.01x10=0.1 2D image. Thats why I have been asking weather the type of image could change the resolution? or probably, it is because there is reflection of electrons to the cathode in SEM to make image which reduces the resolution? Also if we compare electron microscopes to light microscopes, we will find that all light microscopes are based on wave lengths of different colours/ different resolution, so change wave length, change resolution but in TEM and SEM have the same electrons but different resolution! its like same wave length but different resolution, thats what I dont get it. Thanks a lot for your answers. Thiner sample and no electrons reflection in TEM is the answer I guess for the different in resolution ?
10 лет назад+8
Well, I would say that SEM is a probe instrument rather than based upon "optics", so probe characteristic is the governing factor of performance. For instead it TEM behaves more like optics governed by diffraction limits. Also the electrons in a SEM is much lower of energy 1-20 keV compared to TEM that is 100-300 keV.
Watching this the night before my exams since I am running late in working Out everything by myself. Great Video, thank you very much!
Thank you for uploading this video! I found it very useful
Thanks for the video. This is some good work here.
👌👌👌
We want a detailed explanation of how to adjust TEM basic alignment
Glad Påsk! It was quite informative video. Could you suggest any reading material for TEM?
Williams-Carter is the default, www.springer.com/us/book/9780387765006 Came in a new version for some years ago. Other book I like if you are more into materials is Fultz-Howe www.springer.com/us/book/9783540738862
Thanks. I have got my hands on William-Carter and it's a really nice book. I work in the area of catalysis and hydrodeoxygenation (HDO) at Chalmers. I was wondering if you know any book more focussed in catalysis area.
very good and useful
Why scanning electron microscope have less resolution than Transmission electron microscope in spite of both use electrons to create an image?
-A short answer, for SEM, the resolution is determined mainly by the beam spot-size and it's hard to make a small spot. For TEM, the resolution limit is determined by the optics of the system, i.e the errors in the lenses and finally limited by diffraction phenomena, this is sort of similar as for light microscopes.
Thank you. One question more please, SEM is 3D and TEM is 2D image. Would they type of image effect the resolution?
Zoo Zee Not sure about what you really mean here, but for SEM the data of the image is sort of based on an signal average from a small bulk region of the sample were the electron beam hits, so in that way you lessen the resolution, for TEM the samples can be extreamly thin, down to single atomic layers, so from that aspect I guess you can say TEM performs better.
I thought the different in resolution is caused by mathematical calculation Like ( 3D image is the product of 3 dimensional multiplication and 2D is the product of 2 Dimensional multiplication)so when u multiply by 3 numbers you will get higher number than multiplying by2) 0.01x10x10=1 this is 3D image and 0.01x10=0.1 2D image. Thats why I have been asking weather the type of image could change the resolution? or probably, it is because there is reflection of electrons to the cathode in SEM to make image which reduces the resolution? Also if we compare electron microscopes to light microscopes, we will find that all light microscopes are based on wave lengths of different colours/ different resolution, so change wave length, change resolution but in TEM and SEM have the same electrons but different resolution! its like same wave length but different resolution, thats what I dont get it. Thanks a lot for your answers. Thiner sample and no electrons reflection in TEM is the answer I guess for the different in resolution ?
Well, I would say that SEM is a probe instrument rather than based upon "optics", so probe characteristic is the governing factor of performance. For instead it TEM behaves more like optics governed by diffraction limits. Also the electrons in a SEM is much lower of energy 1-20 keV compared to TEM that is 100-300 keV.
This thecnic gives a quantity or quality information?
+Victoria Paz ,I would say quality information. You can only analyze small individual samples, single particles, flakes and so on.
super sir
HOI!
TEMMIE
b
HOI!!!!