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KYY
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When I want to detect single electron(double-slits experiment), can I use usual photosensitive film(like Fuji-film, Kodak-film)? And, what specification I need?
This involves two contradictory things. The double slits experiment involves building up a pattern with billions of electrons (or photons). One electron could turn up anywhere on your film.KYY said:When I want to detect single electron(double-slits experiment)
Thank you for your reply. I just want to know about Claus Jonsson's Double slits experiment. I heard that he used very sensitive film enough to react to weak electron. I don't have to know the electron's exact spatial location. It is enough if I could see electrons' interference pattern. In other words, what I want to know is the method or film that Claus Jonsson utilized to attain this pictureZapperZ said:The standard method of SPATIAL electron detection is to use a CCD. The issue here is not just detecting electrons, but also its spatial location. This is something we do in, say, angle-resolved photoemission spectroscopy, where the photoelectrons are collected at various energy and angular distribution in a single shot. A photomultiplier simply tells you that you detected an electron. It doesn't tell you where exactly within the window of acceptance of that device.
The OP doesn't seem to be aware of how non-trivial this is.
Zz.
https://web.stanford.edu/group/photontheory/ARPES.html
KYY said:Thank you for your reply. I just want to know about Claus Jonsson's Double slits experiment. I heard that he used very sensitive film enough to react to weak electron. I don't have to know the electron's exact spatial location. It is enough if I could see electrons' interference pattern. In other words, what I want to know is the method or film that Claus Jonsson utilized to attain this picture
https://upload.wikimedia.org/wikipedia/commons/e/e4/Claus_Jönsson_Interferenz.jpg
You don't seem to have taken this problem on board. There is no such thing as the interference pattern of a single electron. When it lands, it lands somewhere and the 'pattern' it makes on a sensor / film is just a single spot. The interference pattern is only there when there are enough electrons arriving to form a spatial distribution with the familiar fringes.KYY said:. I don't have to know the electron's exact spatial location. It is enough if I could see electrons' interference pattern.
For detecting the presence of an electron yes - but the OP seems to want a pattern out of the experiment. Would a Channeltron do that?DBO said:A Channeltron or MCP would be best to use here.
DBO said:Somebody mentioned the Millikan oil drop experiment as being a standard for physics students and I bet few have done it. It is actually an extremely difficult experiment to do as it involves squinting thru a microscope for hours and finding just the right droplets and timing them with a stopwatch and adjusting the field to get them to stop falling. Easy to understand, very tough to do.
I'm lacking of a command of English, so my words can be misleading... I do not mean that a 'single electron' forms interference pattern. But I mean that I want to detect a 'single electron' one by one using plate. I want to know concrete experimental method.sophiecentaur said:You don't seem to have taken this problem on board. There is no such thing as the interference pattern of a single electron. When it lands, it lands somewhere and the 'pattern' it makes on a sensor / film is just a single spot. The interference pattern is only there when there are enough electrons arriving to form a spatial distribution with the familiar fringes.
There is no point in replying with the same question, yet again because the answer will be the same and not, I think, what you (think you) want. If you enough time to wait, you could fire billions ( one electron at a time) and that could form an interference pattern.
Ok. So you need to calculate the spacing of the fringe pattern, using the slit separation and the de Broglie wavelength of your beam of electrons etc..Of course it all has to be in a vacuum for the electrons to travel far.KYY said:I'm lacking of a command of English, so my words can be misleading... I do not mean that a 'single electron' forms interference pattern. But I mean that I want to detect a 'single electron' one by one using plate. I want to know concrete experimental method.
KYY said:I'm lacking of a command of English, so my words can be misleading... I do not mean that a 'single electron' forms interference pattern. But I mean that I want to detect a 'single electron' one by one using plate. I want to know concrete experimental method.
. . . . and the spatial resolution of the detector will dictate the Energy (hence the wavelength) of the electron beam that must be used. The fringes must be a sensible fraction of the width of the detector and also a useful multiple of the spacing of the elements of the detector. The OP has not come up with this information yet.ZapperZ said:but also the SPATIAL location of where the electron hit the detector
Fuji-Film and Kodak-Film use a process called scintillation to detect single electrons. This involves using a material that emits light when exposed to radiation from the single electron, which is then captured by a photosensitive film.
Fuji-Film and Kodak-Film have a high sensitivity in detecting single electrons, with the ability to detect even a single electron at a time. This is due to their use of scintillation and photosensitive materials.
Yes, Fuji-Film and Kodak-Film can detect a variety of particles, including protons, alpha particles, and gamma rays. However, they are particularly sensitive to single electrons due to their small size and ability to interact with the scintillation material.
Fuji-Film and Kodak-Film are considered to be reliable and cost-effective methods for detecting single electrons. Other methods, such as using specialized detectors or particle accelerators, may be more accurate but are also more expensive and require specialized equipment.
The ability to detect single electrons has a wide range of potential applications in fields such as medical imaging, particle physics research, and radiation detection. Fuji-Film and Kodak-Film offer a relatively simple and affordable way to achieve this, making them valuable tools in these areas.