Re: electron



Gregory L. Hansen wrote: 
In article <W_nbe.52225$Z14.42457@xxxxxxxxxxxxxx>,
patrick <networkone@xxxxxxxxxx> wrote:

The electron charge to mass ratio e/m is known from experiments. So there is no doubt about that.


But has experiment established for sure the absolute mass and charge e and m independently?
In most calculations in QM and QED it is the ratio e/m that is used i think? 


It's been known for about a hundred years.

http://dbhs.wvusd.k12.ca.us/webdocs/AtomicStructure/Determine-electron-charge.html

I don't know how modern measurements are done, but they might involve a velocity selector and an energy-sensitive detector.


Surely until e and m is established for sure there must be doubt about the electrons extent and whether it is a single particle or a collection of sub particles?


The values of e and m have very little to do with whether the electron has size or whether it's a single particle. E.g. the proton has the same magnitude of charge as the electron, and a known m, and it is composite. The muon has the same charge but a larger mass as the electron, and it is elementary.

The most straightforward way to explore the electron's composition is by scattering experiments. Point particles scatter differently than composite particles, that's how the proton structure was found.


Not to put too fine a point
on the original poster's concern,
but in the realm of points, there are
big points and little points.
The big points are the ones we are going
to be able to resolve with the next improvement
in our technology e.g. better microscope
but the fine points IMIO are cut from finer
cloth.
The Planck length dictates how big the proton
has to be.
The electron is *the insides* of the proton
which are ejected upon its creation like a spray
of millions of stars, which *somehow* stay together
as a (very deformable) cloud stretching from the
nucleus to the atom's edge. The matrix
this material is drawn on is much finer than the
Planck length- it is the next order down.

In the Galaxy Model for the atom, an electron is
a spiral arm of stars, separated from the other electrons
by bands of dust.
http://users.accesscomm.ca/john/

John

.

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