The Naked Scientists

The Naked Scientists Forum

Author Topic: What are the photon energy bands of these 3 effects?  (Read 1593 times)

Offline jeffreyH

  • Global Moderator
  • Neilep Level Member
  • *****
  • Posts: 3918
  • Thanked: 53 times
  • The graviton sucks
    • View Profile
I am looking for information on the photon energy bands involved in the photoelectric effect, Compton scattering and pair production. Is there any overlap in these energy bands?


 

Offline chiralSPO

  • Global Moderator
  • Neilep Level Member
  • *****
  • Posts: 1875
  • Thanked: 143 times
    • View Profile
Re: What are the photon energy bands of these 3 effects?
« Reply #1 on: 03/07/2015 13:57:29 »
The energy required for the photoelectric effect depends on the material that is being ionized (usually on the  a few eV--so mostly UV, with some materials being ionized by blue light, and some requiring X-rays.

Pair production requires significantly higher energies, for instance to produce an electron and positron pair would require gamma rays (at least 1 million eV total energy required). Forming a pair of neutrinos could fall into the UV range because their masses are so low, but otherwise I would say pair production requires photons many, many orders of magnitude more energetic than for the photoelectric effect.

I am not very familiar with Compton scattering, but I think it typically treats electrons as "free" so the energies involved must be at least the ionization of the material interacting with light (or the material must already be a plasma).
« Last Edit: 03/07/2015 13:59:19 by chiralSPO »
 

Offline jeffreyH

  • Global Moderator
  • Neilep Level Member
  • *****
  • Posts: 3918
  • Thanked: 53 times
  • The graviton sucks
    • View Profile
Re: What are the photon energy bands of these 3 effects?
« Reply #2 on: 03/07/2015 18:58:25 »
Thanks for the information. It gives me some avenues to pursue.
 

Offline jeffreyH

  • Global Moderator
  • Neilep Level Member
  • *****
  • Posts: 3918
  • Thanked: 53 times
  • The graviton sucks
    • View Profile
Re: What are the photon energy bands of these 3 effects?
« Reply #3 on: 03/07/2015 20:28:28 »
I need some verification of a statement on wikipedia.

https://en.wikipedia.org/wiki/Planck_mass#Significance
[The Planck mass is nature’s maximum allowed mass for point-masses (quanta) – in other words, a mass capable of holding a single elementary charge. If two quanta of the Planck mass or greater met, they could spontaneously form a black hole whose Schwarzschild radius equals their Compton wavelength.]

It says this needs a citation so I'm very unsure about its veracity.
 

Offline jccc

  • Hero Member
  • *****
  • Posts: 990
    • View Profile
Re: What are the photon energy bands of these 3 effects?
« Reply #4 on: 06/07/2015 06:35:09 »
find out who invented those theories/ideas, ask them.

who else know better?
 

The Naked Scientists Forum

Re: What are the photon energy bands of these 3 effects?
« Reply #4 on: 06/07/2015 06:35:09 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums