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Is it possible to perform am experiment like that of Stern-Gerlach but with electrons instead of silver atoms?
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I don't understand. From the abstract it would seem it can be done:my2cts said:This link says it cannot be done:
http://en.wikipedia.org/wiki/Stern–Gerlach_experiment#cite_note-2
It doesn't matter. Any paper that says it can't be done with electrons is so far wrong that it should be shunned.my2cts said:The link on the wik page is to a comment to the paper of which you quote the abstract.
I have no access to the comment nor the paper.
Just another example of why scientific papers should be accessible to the public.
Extract of parts of that comment in PRL:my2cts said:The link on the wik page is to a comment to the paper of which you quote the abstract.
I have no access to the comment nor the paper.
Just another example of why scientific papers should be accessible to the public.
If you have a reference to a peer reviewed scientific paper demonstrating the Stern-Gerlach experiment on an electron beam, by all means, share it and update the wikipedia page.phinds said:It doesn't matter. Any paper that says it can't be done with electrons is so far wrong that it should be shunned.
Hm ... not so clear-cut as I thought. I did a bit of quick research and have found that while it apparently IS possible to do a Stern Gerlach experiment on electrons, it is not quite the same experiment because the normal Stern-Gerlach magnets don't work well with electrons. Instead something called a longitudinal method (as opposed to the transverse method of the standard SG experiment) is used.my2cts said:If you have a reference to a peer reviewed scientific paper demonstrating the Stern-Gerlach experiment on an electron beam, by all means, share it and update the wikipedia page.
The Stern-Gerlach experiment was first done using a beam of atoms, which were separated into "up" and "down" streams according to their magnetic orientation. But it was soon learned that all kinds of objects, not just atoms but individual sub-atomic particles such as electrons, suffer a similar fate when passed through a Stern-Gerlach device. Where does the Weirdness Go / David Lindley / p16
At this point we are going to skate over a small technical complication ... [discussion of why direct SG experiment doesn't work on electrons] ... In everything that follows we will take it for granted that a suitable device can indeed separate electrons in the desired way, and ignore other electromagnet effects
my2cts said:The link on the wik page is to a comment to the paper of which you quote the abstract.
I have no access to the comment nor the paper.
Just another example of why scientific papers should be accessible to the public.
DrClaude said:There is a more recent paper by Batelaan:
S. McGregor et al., Transverse quantum Stern–Gerlach magnets for electrons, New J. Phys. 13 065018 (2011).
In the Stern–Gerlach experiment, silver atoms were separated according to their spin state (Gerlach and Stern 1922 Z. Phys. 9353–355). This experiment demonstrates the quantization of spin and relies on the classical description of motion. However, so far, no design has led to a functional Stern–Gerlach magnet for free electrons. Bohr and Pauli showed in the 1930 Solvay conference that Stern–Gerlach magnets for electrons cannot work, at least if the design is based on classical trajectories (Pauli W 1932 Proc. of the 6th Solvay Conf. 2 (1930) (Brussels: Gauthier-Villars) pp 183–86, 217–20, 275–80; Pauli W 1964 Collected Scientific Papers ed R Kronig and V F Weiskopf, vol 2 (New York: Wiley)). Here, we present ideas for the realization of a Stern–Gerlach magnet for electrons in which spin and motion are treated fully quantum mechanically. We show that a magnetic phase grating composed of a regular array of microscopic current loops can separate electron diffraction peaks according to their spin states. The experimental feasibility of a diffractive approach is compared to that of an interferometric approach. We show that an interferometric arrangement with magnetic phase control is the functional equivalent of an electron Stern–Gerlach magnet.
The Stern-Gerlach experiment is a classic experiment in quantum mechanics that demonstrates the concept of electron spin. It involves passing a beam of electrons through a non-uniform magnetic field, which causes the electrons to split into two distinct paths based on their spin orientation.
The Stern-Gerlach experiment provided evidence for the existence of electron spin and confirmed the predictions of quantum mechanics. It also helped to lay the foundation for the development of quantum computing and other technologies that rely on the principles of quantum mechanics.
The experiment involves passing a beam of electrons through a magnetic field, which exerts a force on the electrons based on their spin orientation. This causes the electrons to split into two paths, with one path corresponding to electrons with spin up and the other path corresponding to electrons with spin down.
The results of the experiment showed that the electrons split into two distinct paths, rather than being deflected continuously as would be expected for a classical particle. This provided evidence for the quantized nature of electron spin and supported the predictions of quantum mechanics.
The Stern-Gerlach experiment provided experimental evidence for the principles of quantum mechanics, such as the quantization of spin and the discrete energy levels of electrons. It also demonstrated the probabilistic nature of quantum systems and the role of measurement in determining the state of a system.