electrometer 9ev or more

[john_gr]

Hi all,

I'd like to made an electrometer to measure from 9 ev energy one electron energy. But, I think this is not possible. So, how can I measure the energy from excite atoms . If I excite a mass of metal can I take some energy on my electrometer?

look this
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and this
**broken link removed**

this is toooo expensive but it can measure some ev energy 9ev or more....

haves some an cheap idea?

 

[FvM]

I'm not sure if you know exactly what you want to achieve, but at least you didn't manage to explain it clearly. Please describe the experiment setup in detail.

 

[BradtheRad]

Maybe you want to detect static charge from a distance? A single FET will do that.

http://amasci.com/emotor/chargdet.html

Many transistors and cmos gate IC's can pick up electromagnetic 'noise', if you connect a few inches of wire to the input terminal. Hook up normal supply V. Read the output level with a meter or oscilloscope.

Use an inexpensive device. It can be risky to expose it to higher volt levels than it is designed for.

I picked up one of these cheap on Ebay. It is not very sensitive. I have to hold it close to a tv (crt type), before it will light any led's.

 

[john_gr]

I'd like to measure energy.

http://en.wikipedia.org/wiki/Electrometer

The external connections are usually of a co-axial or tri-axial design, and allow attachment of diodes or ionization chambers for radiation measurement.

I made a G-M detector but it can't measure very low energies

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I can't find this item on ebay:-(
I'd like to measure with photodiode I hope this methode it has more accuracy

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I found this

http://www.datasheetcatalog.org/datasheets2/13/134302_1.pdf

but I can't find datasheet of SD8607 Opto Silicon Detector.

 

[FvM]

Single electron energy can be measured by p-n diodes (usually larger area photo-diodes) by determining current pulse area (pulse charge). This doesn't work well with slow "electrometer" amplifiers, you'll want to use fast transimpedance amplifiers followed by pulse-height discriminators.

Single electron measurement (particularly at rather low energies) will be carried out in a vacuum chamber.

What's your intended setup?

 

[BradtheRad]

I made a G-M detector but it can't measure very low energies

Would this be the tube from a geiger counter?

It has a more sensitive cousin known as a scintillator. A single charged particle can trigger it.

From the Wikepedia website:

https://en.wikipedia.org/wiki/Scintillation_counter

"When a charged particle strikes the scintillator, the phosphor's atoms are excited and emit photons, which are directed at the photomultiplier tube's photocathode which is connected to the negative of a high voltage source. Each incident photon releases an electron. A number of accelerating electrodes called dynodes are arranged in the tube at increasing positive potentials and the electron is accelerated by this electric field towards the first dynode. The incident electron causes multiple secondary electrons to be emitted, which accelerate towards and hit the second dynode. More electrons are emitted and the electron multiplication chain continues through the increasing potentials of the dynodes, with increasing numbers of electrons generated each time. By the time the electrons reach the anode, enough have been released to generate a measurable voltage pulse across external resistors. This voltage pulse is amplified and recorded by the processing electronics."

 

[john_gr]

What's your intended setup?

I'd like setup an discriminator - analyzer. But with "G-M tube" proportional counter I can't measure the energy of metal excite

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I'd like measure atom's energy. This is static energy in mass of material. How can they measure the electron energy (1,602 x e -19 c or ev or j

 

[john_gr]

I have laser diode 1w. I try to excite metal but I can't measure some energy on G-M tube. Must I give more energy?