What is the smallest thing we can see with an electron microscope?

  • Context: Graduate 
  • Thread starter Thread starter WarrickF
  • Start date Start date
  • Tags Tags
    Electron
Click For Summary

Discussion Overview

The discussion revolves around the capabilities and limitations of electron microscopes, as well as comparisons with other types of microscopes such as protonic and ionic microscopes. Participants explore the smallest measurable entities in physics, including electrons and protons, and the principles behind imaging at the subatomic level.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants propose that electron microscopes are the smallest visual measurement tools, suggesting that they can "see" electrons.
  • Others, including Daniel, argue that protonic and ionic microscopes have greater resolution than electron microscopes and express skepticism about the possibility of seeing particles like electrons.
  • Warrick questions the principles behind proton and electron guns, seeking clarification on how they operate.
  • One participant clarifies that electron microscopes do not see electrons directly but use electrons to image larger objects, emphasizing the need for the imaging mechanism to be smaller than the object being observed.
  • There is a discussion about the mass of protons relative to electrons, with one participant stating that a proton is 1836 times the mass of an electron.
  • Another participant wonders if there are images representing the shape of a proton and questions how the mass ratio was determined experimentally.
  • A speculative idea is presented about using hadronic colliders to create quantum-scale black holes for imaging at extremely small scales, though this remains a hypothetical approach.

Areas of Agreement / Disagreement

Participants express differing views on the capabilities of electron versus protonic and ionic microscopes, with no consensus on whether electrons can be "seen" or the implications of imaging at the subatomic level. The discussion remains unresolved regarding the specifics of imaging techniques and the nature of particles.

Contextual Notes

Participants mention various assumptions about the sizes of electrons and protons, as well as the principles behind imaging techniques, without resolving these uncertainties. The discussion includes references to experimental methods for determining particle masses but does not clarify all underlying assumptions.

WarrickF
Messages
45
Reaction score
0
Hi All,

To the best of my knowledge the electron microscope is the smalled visual mesurment tool available. So it's my understanding that the smallest "thing" we've been able to "see" is another electron. I've probably make some very bad scientific statement but I'm trying to find which of all these quarks, fermions etc. are really measurable and which are simply thought to exist based on experiment.

Thanks
Warrick
 
Physics news on Phys.org
Nope,a protonic and an ionic microscope have greater resolution than an electronic one...

As for "seing" particles,well,nope,never ever and simply doubt it will possible...

Daniel.
 
Oh wow, I didn't know there was such a thing. So I'm guessing these work on the same principal? You have a proton gun firing against some tightly packed latice and you measure the bounce back (I have no idea what you'd call this ;) )?

I've always wondered how these guns work? How does an electron gun or a proton gun superate one electron and "fire" it?
 
dextercioby said:
Nope,a protonic and an ionic microscope have greater resolution than an electronic one...

As for "seing" particles,well,nope,never ever and simply doubt it will possible...

Daniel.

Is the resolution of those even better than AFMs?

warrick: I suppose the principle should be pretty much the same.
 
BTW, an electron microscope doesn't see electrons. It uses electrons to see things larger than electrons. To see anything, your "seeing" mechanism has to be smaller than your "seen" object.
 
DaveC426913 said:
BTW, an electron microscope doesn't see electrons. It uses electrons to see things larger than electrons. To see anything, your "seeing" mechanism has to be smaller than your "seen" object.

True - so if there is such a thing as an proton based microscope is it possible to see an electron using it? I'm making the assumption that electrons are larger than protons which I have a feeling is incorrect.

I know the scale of an electron the the nucleus is about 1:2000 but I'm not sure what size a proton is.
 
A proton is 1836 times the mass of an electron.

In a hydrogen nucleus, there's only one proton. A uranium nucleus might be about (1836x238) times as large as an electron.

This is why they use electrons in microscopes. They're the lightest/smallest subatomic particle = best resolution.
 
So does that mean that there really is an image somewhere that represents the shape of a proton? Just wondering if there is something out there that allows you to physically see the shape.

How on Earth did anyone ever get to that figure 1836 x the mass of an electron? I can't begin to imagine the experiment that determined this.
 
hey- what about using a hadronic collider to create artificial quantum-scale black holes and bombard an object with them- then anaylize the hawking radiation as the the little fellows go poof- couldn't you perhaps get some kind of data to reconstruct a detailed image/timeslice of the femto/atto/zepto/yocto scale? :bugeye: :cool: :-p
 
Last edited:
  • #10
What's a hadronic collider ?
 
  • #11
WarrickF said:
So does that mean that there really is an image somewhere that represents the shape of a proton? Just wondering if there is something out there that allows you to physically see the shape.
Yep. There's pictures, but I can't find any right now.
WarrickF said:
How on Earth did anyone ever get to that figure 1836 x the mass of an electron? I can't begin to imagine the experiment that determined this.
You smash atoms together and let the debris pass through a strong magnetic field. Because the pieces are charged, their paths bend. The degree of bending tells us how heavy they are.

See Wikipedia's bubble chamber entry.
 

Similar threads

  • · Replies 46 ·
2
Replies
46
Views
6K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 6 ·
Replies
6
Views
5K
  • · Replies 46 ·
2
Replies
46
Views
6K
  • · Replies 6 ·
Replies
6
Views
8K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 15 ·
Replies
15
Views
3K
  • · Replies 2 ·
Replies
2
Views
1K