X-ray process and electrons involved

Click For Summary

Discussion Overview

The discussion revolves around the X-ray emission process, particularly focusing on the behavior of electrons involved in generating X-rays and the theoretical calculations related to K-alpha, K-beta, and K-gamma emissions. Participants explore both conceptual and technical aspects, including the effects of different coupling schemes and the challenges of theoretical calculations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant describes the basic X-ray process where an electron collides with a metal, resulting in photon emission, and questions what happens to the electron.
  • Another participant elaborates on the energy loss of electrons through collisions with core electrons and deceleration in the metal, leading to characteristic and continuous X-ray emissions.
  • A participant expresses a need for more advanced information regarding the effects of LS and JJ coupling, as well as the theoretical calculation of K-alpha, K-beta, and K-gamma without experimental data.
  • One participant questions the relevance of LS and JJ couplings in calculating X-ray spectra and suggests that solving the Schrödinger equation for a many-electron atom is necessary for core energy levels, mentioning the Slater prescription for effective nuclear charges.
  • Calculating the power spectrum of Brehmstrallung is noted as a complex problem.

Areas of Agreement / Disagreement

Participants express differing views on the importance of LS and JJ couplings in the context of X-ray spectra calculations, indicating a lack of consensus on this aspect. The discussion remains unresolved regarding the theoretical approaches to calculating K-alpha, K-beta, and K-gamma emissions.

Contextual Notes

Participants mention the complexity of the calculations involved and the limitations of current methods, such as the coarse approximations used in effective nuclear charge calculations. There is also an acknowledgment of the challenges in calculating Brehmstrallung power spectra.

hagopbul
Messages
397
Reaction score
45
:confused:the X-Ray the process is like this:
An electron hit the metal so there is a photon is emitted.
My Q is what happened to the electron that cases the X-ray
And what is K(a),K(b),K(g).
Or we call them K(alpha),K(beta),K(gamma).
 
Physics news on Phys.org
hagopbul said:
:confused:the X-Ray the process is like this:
An electron hit the metal so there is a photon is emitted.
My Q is what happened to the electron that cases the X-ray
The target is typically grounded, so the impinging electrons are conducted away to a large sink. Before this happens, the electrons lose energy through 2 processes:
(i) by collision with a core electron in the metal atom, which it "kicks" out - this produces characteristic x-ray lines (K-alpha, K-beta, L-alpha, etc.)
(ii) by deceleration through the bulk of the metal - this produces a continuous distribution of x-rays, known as brehmstrallung.

And what is K(a),K(b),K(g).
Or we call them K(alpha),K(beta),K(gamma).
The nomenclature is explained here: http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/xrayc.html#c1
 
but this is not enough

i know the information in the article that you gave but it is not enough and i need more sophisticated information like the effect of LS (marriage) and JJ(marriage)
and the effect of the [effective charge ] and can i calculate theoretically K(alpha),K(beta),K(gamma) and find them theoretically by using the Q mechanics without using the experiment]
and thank you very mach
and help !:cry::cry::confused:
 
I don't see why LS- and JJ-couplings are important in calculating the x-ray spectra. If you want to try to calculate the core energy levels of a pure target metal (say, Mo), then you will have to solve the Schrödinger equation for a giant many-electron atom, with your favorite choice of approximation (this is now a problem independent of x-rays). The only method I know of that one can get very approximate energies from is using the Slater presciption for calculating effective nuclear charges for electrons in different subshells. The approximation is way coarser than any fine-structure corrections, so orbitals within a subshell are considered degenerate.

Calculating the power spectrum of the Brehmstrallung is also a hard problem.

For more sophisticated calculations, the person here that can help is quetzalcoatl.
 
Last edited:

Similar threads

  • · Replies 3 ·
Replies
3
Views
6K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 4 ·
Replies
4
Views
5K
  • · Replies 0 ·
Replies
0
Views
3K
  • · Replies 15 ·
Replies
15
Views
3K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
Replies
37
Views
7K
  • · Replies 12 ·
Replies
12
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K