Measuring the time-of-flight of the electrons from flash to detection
at the top/electrometer to determine/prove gravity repulsion might be a
chore
You're right Fred, what would be needed is not an electrometer maybe
(mechanical stuff with inertia isn't it?)
What would you think of the following setup:
- Grounded photocathode at the bottom of the tube
- Grounded grid at the top of the tube (so tube is fieldless)
- Plate above the grid connected to positive terminal of a low voltage power
supply whose negative terminal is grounded.
Time of flight would be time between laser flash and power supply current
pulse wouldn't it?
Michel
P.S. Nice applet indeed!
P.P.S. No I know nothing about vacuum tubes (was born in 57)
----- Original Message -----
From: "Frederick Sparber" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, April 14, 2006 3:56 AM
Subject: Re: Electrogravity & Proton Repulsion of Electrons
Michel Jullian writes.
Ingenious! (Faraday cup and saucer, indeed ;)
Very British for tea, what? :-)
For electrons slow enough not to produce secondary emission I would have
thought a simpler collecting device, not a hollow one, would work: a grid
surrounding a solid conductor, the latter positive wrt the former.
In vacuum tubes (if you are old enough to remember them)
they call that the suppressor grid, usually tied
internally to the cathode.
For the ultra-low energy emitter photo-emission should work better than
thermo-emission as it will give more homogeneous energies (precisely
controlled by incident light wavelength aren't they?)
I think an LED/or laser could cause low energy-low velocity electron
emission from a low work function photo-emissive material.
One of Walter Fendt's applets for materials:
http://www.walter-fendt.de/ph14e/photoeffect.htm
Measuring the time-of-flight of the electrons from flash to detection
at the top/electrometer to determine/prove gravity repulsion might be a
chore
Fred
Michel
