Motion of a photoelectron

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Discussion Overview

The discussion revolves around the motion of a photoelectron when an atom absorbs energy equal to the work function. Participants explore the implications of this energy threshold on the electron's motion both within the material and after it has potentially escaped.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Exploratory

Main Points Raised

  • Some participants reference Einstein's photoelectric equation, suggesting that the kinetic energy (KE) of the photoelectron would be zero if the energy absorbed is exactly equal to the work function.
  • Others argue that there is sufficient energy for the electron to escape from the surface, questioning the implications of this energy level.
  • A participant expresses uncertainty about the clarity of the original question, noting that "motion of photoelectron" could refer to different states: while still in the material or after leaving the surface.
  • There is a suggestion that if the electron has just enough energy to reach the surface, it may tend to return to its original state, although this is presented as a logical consideration rather than a claim.
  • Some participants highlight the need for a more detailed understanding of the work function and its components, referencing Spicer's 3-step model of photoemission as a potential framework for discussion.
  • Another participant mentions that a simpler model might be more effective than the 3-step model, indicating differing views on the complexity of the explanation needed.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the implications of the work function on the motion of the photoelectron, with multiple competing views and uncertainties remaining in the discussion.

Contextual Notes

The discussion reveals limitations in the clarity of the original question and the assumptions underlying the concept of work function, as well as the varying interpretations of the electron's motion.

Himal kharel
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if an atom absorbs energy just equal to work function what happens to motion of photoelectron?
 
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Einstein's photoelectric equation says that the KE of the photoelectron will be zero.
 
I don't think the electron is ejected...
 
But there is enough energy for the electron to escape from the surface.
 
Himal kharel said:
if an atom absorbs energy just equal to work function what happens to motion of photoelectron?

People are responding to this question as if it is clear what is being asked. Maybe I know this area too much that I can't see the forest, but what exactly is meant by "motion of photoelectron"? There are several different motions here, and it is unclear how much in detail this member is asking. There is the motion of the electron while STILL in the material, and then there's "motion" (or lack there of if it has zero KE left) once it left the surface of the material.

Zz.
 
,,,it is unclear how much in detail this member is asking.

yes, but maybe we can assist by answering a question...as we all know asking the RIGHT question is usually not easy...
 
But there is enough energy for the electron to escape from the surface.

Why do you think that will happen??
 
... because that is what 'work function' means. If it has that much energy it will have enough to get to the surface.
 
Exactly...JUST enough energy toget to the surface...so would it not TEND to return to it's former state??

I am not claiming that, but simple logic seems to suggest it...
 
  • #10
Naty1 said:
Exactly...JUST enough energy toget to the surface...so would it not TEND to return to it's former state??

I am not claiming that, but simple logic seems to suggest it...

See, this is exactly what I meant when I said that the question is vague, but you think it can still be "answered". When you start splitting hairs and want to know what exactly is going on AT the work function energy, then the details now make a heck of a difference!

For example, did anyone bother to look up Spicer's 3-step model of photoemission? Or did anyone even consider all the components that make up this so-called "work function"? Yet, we seem to think that we can easily answer such a question.

The OP did a post-and-run. He/she hasn't come back yet to offer any response, while leaving the rest of us holding the bag and arguing what's in it. Consider that for a minute.

Zz.
 
  • #12
ZapperZ said:
For example, did anyone bother to look up Spicer's 3-step model of photoemission?

One step model is way better :)
 

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