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Sandeep T S
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How photon transfer energy to electron in case of photoelectric effect,and compton effect. Is any high level theory which explains this scenario?
Sandeep T S said:How photon transfer energy to electron in case of photoelectric effect,and compton effect. Is any high level theory which explains this scenario?
What are they?ZapperZ said:Compton effect: this is basically conservation of energy and momentum in a "collision", something you should be familiar with in basic kinematics.
Photoelectric effect: this requires knowledge of energy bands in a solid, because this is where the standard photoelectric effect occurs. A solid has the same idea of energy levels (in this case, continuous bands) as what you may already know in atoms. When a photon with sufficiently high enough energy excite an electron, it has the probability to escape the solid.
If you need more than this, i.e. "high level theory", then you also need "high level physics education".
Zz.
Sandeep T S said:What are they?
I only mean that those classical term like momentum,and quanta. are they are most experimental evidant theory. Is anyone proposed any new theory which explains those phenomenasZapperZ said:They are those.
Zz.
Sandeep T S said:I only mean that those classical term like momentum,and quanta. are they are most experimental evidant theory. Is anyone proposed any new theory which explains those phenomenas
Which part of the current explanation of the Photoelectric Effect do you think needs fixing?Sandeep T S said:Is anyone proposed any new theory which explains those phenomenas
berkeman said:Which part of the current explanation of the Photoelectric Effect do you think needs fixing?
https://en.wikipedia.org/wiki/Photoelectric_effect
View attachment 222115
Wikipedia said:The direction of distribution of emitted electrons peaks in the direction of polarization (the direction of the electric field) of the incident light, if it is linearly polarized.
Wikipedia said:In the X-ray regime, the photoelectric effect in crystalline material is often decomposed into three steps:
Great idea!ZapperZ said:which is why I keep "threatening" to write my own Insight article on the Photoelectric Effect.
Have you tried editing the Wikipedia article? Just for your health.ZapperZ said:I had to stop there before I pop a blood vessel!
My doctor always says if a treatment doesn't work you obviously need more of it.vanhees71 said:To edit a Wikipedia article may be anything, but not good for your health ;-)).
Derek P said:Have you tried editing the Wikipedia article? Just for your health.
vanhees71 said:I must say that today the Wikipedia article about SRT is ok
jeremyfiennes said:Photons interact with electrons as if they were classical particles.
jeremyfiennes said:Is that not what Compton scattering is: collisions as if between classical particles?
jeremyfiennes said:Wikipedia
jeremyfiennes said:What is a reliable place to get this information?
jeremyfiennes said:what then is the Compton effect?
HAYAO said:In a very rough description, when the incident photon "hits" an electron, the electron "recoils" off.
No doubt about it. Not that I know QFT like physicists, but there is no good classical analog to this interaction.PeterDonis said:But that's the problem: this "rough" description is too rough, because it leaves out all the quantum mechanics. Even at a heuristic level, the interaction is not properly described as one photon and one electron "colliding", because, in perturbative QFT terms:
(a) The lowest level Feynman diagram for this process has two vertexes, not one (since each vertex connects only three lines, the incoming/outgoing electron lines and the photon line, so to get a full diagram with a photon line coming in and a photon line going out, you need two vertexes);
(b) Making correct predictions about the actual experimental data requires more than just the lowest level Feynman diagram.
And, of course, Feynman diagrams are not really direct descriptions of processes happening in spacetime anyway. (For one thing, they're usually analyzed in momentum space.)
The photoelectric effect is a phenomenon where electrons are emitted from a material when it is exposed to light. This occurs when photons of sufficient energy strike the material and transfer their energy to the electrons, causing them to be ejected from the material.
The Compton effect is a phenomenon where a photon of high energy collides with an electron, transferring some of its energy to the electron and causing it to scatter at a different angle. This results in a decrease in the energy and an increase in the wavelength of the photon.
The main difference between the photoelectric effect and the Compton effect is the type of interaction that occurs between photons and electrons. In the photoelectric effect, the photon transfers all of its energy to the electron, causing it to be emitted from the material. In the Compton effect, the photon transfers only some of its energy to the electron, resulting in a change in the photon's energy and wavelength.
The photoelectric effect and Compton effect both demonstrate the wave-particle duality of light, which states that light can behave as both a wave and a particle. The photoelectric effect shows the particle nature of light, as photons transfer their energy to electrons in a discrete manner. The Compton effect demonstrates the wave nature of light, as the scattered photons exhibit a change in wavelength, similar to the diffraction of waves.
The photoelectric effect has various practical applications, such as in photovoltaic cells for converting light energy into electrical energy, in photocells for detecting light, and in imaging technologies such as digital cameras. The Compton effect is used in medical imaging techniques like Computed Tomography (CT) scans, as well as in X-ray diffraction for studying the structure of materials.