I smoked some weed and wanted to listen to some electronic music, now i am stuck here.
@philosophicalscience2 жыл бұрын
I operate TEM and believe me this is one of the best lecture on TEM with indepth insights... Thank you sir for such videos
@gigglysamentz20214 жыл бұрын
The cap with the lowest voltage is called "Wehnelt cylinder", in case you were wondering how it's spelled.
@leicalove93843 жыл бұрын
Thanks a lot!
@dantyler69073 жыл бұрын
The top most "box" does not contain the filament. The filament resides just below that box, which is an IGP (a vacuum pump).
@speeses7 жыл бұрын
This was a great lecture! I have been wanting to learn more about the EM scope for quite some time now, and this really helped. I am excited to watch the rest of your KZbin lectures.
@heathersoileau4684 Жыл бұрын
New grad student trying to prepare myself for a cryo-EM project. This was so helpful! Thank you!
@peasant123454 жыл бұрын
perfect toefl listening tests
@danieloljirafufar27399 жыл бұрын
Thank you very much for this awesome tutorial...
@juanwei77962 жыл бұрын
The best interpretation
@mayukhmalidas3 жыл бұрын
Great video
@sahanarao109 жыл бұрын
What is the advantage of the accelerator stack over a single anode? Is it just to focus the beam better and increase temporal coherence?
@philosophicalscience2 жыл бұрын
To accelerate the velocity of electrons
@keyboard_toucher5 жыл бұрын
300kV "a very low voltage"
@peasant123454 жыл бұрын
negative
@deepphysics24733 жыл бұрын
What's amazing
@warriorfa6 жыл бұрын
Electric field line should be vertical not horizontal. F=qE, the force applied on electron is the same direction of electric field direction
@amankapoor1006 Жыл бұрын
That's what I was thinking...
@rajeshprasadlectures11 ай бұрын
You are right in questioning the horizontal lines being called the field lines. They should appropriately be called equipotential surfaces. The field lines are perpendicular to the equipotential surfaces and so will be vertical as you have rightly pointed out.
@nikolaurben80954 жыл бұрын
Lanthanum hexaboride (LaB6) crystals
@arashghasemi3 жыл бұрын
Similar thing called pentode in another field
@dathstar9 жыл бұрын
thank you so much you did a great job dud !
@venkatanarayanaare43863 жыл бұрын
Is it possible to change the beam wavelength in electron microscopy for solving the Anamolos structures?
@albertvandrejer50037 жыл бұрын
i guess u meant equipotential lines instead of field lines at ~5:10?
@RottenStrawburry4 жыл бұрын
yes, I think he made a mistake by accvident.
@brandonread6274 жыл бұрын
Thank you, I was confused by his statement. Your suggestion makes much more sense.
@amankapoor1006 Жыл бұрын
That would make a lot of sense
@rajeshprasadlectures11 ай бұрын
You are right. They should appropriately be called equipotential surfaces.
@sweetbean51394 жыл бұрын
is there a part 2 for this?
@haidaihu72714 жыл бұрын
6:06 should be 0.02 angstrom for 2 picoM
@EugeneAnokhin3 жыл бұрын
well, he just said so - two hundredths :)
@nukeelda6 жыл бұрын
Viktor grebenikov used this principle to fly
@frtard7 жыл бұрын
This is definitely NOT a generic electron gun.
@ryanclarke21618 жыл бұрын
300kv negative is a is not a low voltage
@d4ark9728 жыл бұрын
It's a high negative number, which is why it's "very low" (because it's so much below zero).
@ryanclarke21618 жыл бұрын
Cant even
@shuminli52187 жыл бұрын
Awesome tutorial
@Desmond.226 ай бұрын
🎯 Key Takeaways for quick navigation: 00:05 *Electrons escape a bent wire due to collisions, akin to water molecules evaporating from a stream.* 01:48 *In electron microscopes, electrons are accelerated downwards towards the sample using strong electric fields.* 03:20 *A Wehnelt cylinder focuses electron spray towards a central point.* 03:50 *Accelerator stacks gradually increase electron voltage, reaching speeds of 76% of the speed of light.* 06:05 *Electron wavelengths in microscopes are small enough to visualize details smaller than a single atom.* 08:28 *Electron guns require conditioning to clean and stabilize the system.* 09:09 *Sulfur hexafluoride gas is used for insulation in high-voltage tanks, posing asphyxiation risks if leaked.* 11:18 *Electron guns require spatial and temporal coherence for clear imaging.* 13:48 *Tungsten, LaB6, and field emission guns are common filament types, differing in coherence and cost.* 16:54 *Field emission guns provide the highest coherence but are costly and require precise temperature control.* Made with HARPA AI
@sarahmilam64528 жыл бұрын
Is this what they are teaching at Cal- Tech?
@Blahcub7 жыл бұрын
Yes, that's why there's a teacher lecturing on the topic at caltech
@adamwylder83886 жыл бұрын
Are y'all REAL fans? this is the material he presents to lab members to teach em, formalized in a video format for public consumption. Real fans watch the intro video smh
@amankapoor1006 Жыл бұрын
Can someone explain why the electric field lines in the accelerator stack are perpendicular to the path of the beam? I would have thought that the electric field lines should point in the direction of decreasing potential, from 0 V to - 270kV, anti-parallel to the path of the beam. Also, if the electric field lines are perpendicular to the path of the beam, why is the electron beam not deflected, as it would be experiencing a force perpendicular to its velocity?
@rajeshprasadlectures11 ай бұрын
You are right in questioning the horizontal lines being called the field lines. They should appropriately be called equipotential surfaces. The field lines are perpendicular to the equipotential surfaces and so will be parallel to the path of the beam, as you have rightly suggested.