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Author Topic: Can light be used to produce electrons?  (Read 3824 times)

Offline lastharbour

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Can light be used to produce electrons?
« on: 08/10/2009 19:29:19 »
i've been told that high frequencies of light can make electrons pop into existence.

is it true to say that the light actually turns into the electron / positron pair? or is something else going on?

thanks, j
« Last Edit: 13/10/2009 22:04:20 by chris »


 

Offline Ron Hughes

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Re: Can light be used to produce electrons?
« Reply #1 on: 11/10/2009 21:34:14 »
It has been done with the collision of two beams of energy. 10^25 Hertz with 10^14 hertz. Four photons were turned into an electron and positron.
 

Offline lastharbour

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Re: Can light be used to produce electrons?
« Reply #2 on: 13/10/2009 19:53:24 »
thanks for the info Ron.

can we say that the photons somehow get bound up into a new state (lepton and anti-lepton)? a nice tidy reversable transformation?

(or is there a good book or website that deals with these kinds of things? I'm an avid listener of Drs. Karl and Chris and I realise this is a little off the beaten path.)

cheers!
 

Offline Ron Hughes

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light into particles?
« Reply #3 on: 14/10/2009 05:33:28 »
I wish someone could tell me how it happens. Right now most of the real brains in physics are tied up with QM. Dealing with electromagnetic energy being turned into mass with a charge tends to through a monkey wrench into the standard model so most of those guys tend to ignore that particular experiment.
 

Offline lastharbour

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Can light be used to produce electrons?
« Reply #4 on: 14/10/2009 18:38:38 »
I guess it's a "watch this space" until the men in white figure it out. good to know it's not just me struggling to understand this experimental evidence though.

thanks again!
 

Offline lightarrow

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Can light be used to produce electrons?
« Reply #5 on: 14/10/2009 21:19:06 »
i've been told that high frequencies of light can make electrons pop into existence.

is it true to say that the light actually turns into the electron / positron pair? or is something else going on?
I think it only depends on energy and momentum; there is no need of photons, you could do it with every object with energy and massless (with the right momentum).
 

Offline lastharbour

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Can light be used to produce electrons?
« Reply #6 on: 14/10/2009 22:20:25 »
well, that sounds pretty amazing. are you talking about the electromagnetic spectrum still or could something else do it?
 

Offline Dimi

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Can light be used to produce electrons?
« Reply #7 on: 14/10/2009 22:37:22 »
So effectively 'transmutation' ?
 

Offline lightarrow

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Can light be used to produce electrons?
« Reply #8 on: 15/10/2009 11:39:47 »
well, that sounds pretty amazing. are you talking about the electromagnetic spectrum still or could something else do it?
I'm talking of everything.
 

Offline lastharbour

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Can light be used to produce electrons?
« Reply #9 on: 16/10/2009 20:43:43 »
Ok. thanks, lightarrow!

What I'm imagining now is a kind of positron / electron annihilation in reverse. Is that fair?

So, the key thing is to focus the right amount of energy (in whichever form)on a specific point and the positron and electron (but potentially other particles and anti-particles too) will be created out of the energy (or some other process caused by the concentration of the energy)...

that was a long sentence! did i get it right??

thanks guys, i'm enjoying trying to get my head round this!
 

Offline lightarrow

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Can light be used to produce electrons?
« Reply #10 on: 17/10/2009 12:10:37 »
Ok. thanks, lightarrow!

What I'm imagining now is a kind of positron / electron annihilation in reverse. Is that fair?

So, the key thing is to focus the right amount of energy (in whichever form)on a specific point and the positron and electron (but potentially other particles and anti-particles too) will be created out of the energy (or some other process caused by the concentration of the energy)...

that was a long sentence! did i get it right??

thanks guys, i'm enjoying trying to get my head round this!
I think it's so.
 

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Can light be used to produce electrons?
« Reply #10 on: 17/10/2009 12:10:37 »

 

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