Atomic Electron Transition Intervals

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Discussion Overview

The discussion revolves around atomic electron transition intervals, specifically focusing on the time it takes for electrons in atoms to transition from excited states back to lower energy states after absorbing photons. Participants explore the concept of spectral lines resulting from these interactions and inquire about available resources or charts that detail these transition intervals for different elements.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants inquire about charts or information regarding atomic electron transition intervals for various elements, questioning whether each element has a specific time frame for absorption and re-emission.
  • One participant suggests that the inquiry pertains to the lifetime of excited states, noting that each excited state has its own lifetime, leading to multiple possible answers for a given element.
  • Another participant emphasizes that a lifetime does not imply a minimum waiting time for transitions, indicating that transitions can occur earlier than the defined lifetime.
  • References to the NIST Handbook of Basic Atomic Spectroscopic Data are made, which contains Einstein coefficients for spontaneous emission for many excited states.
  • Some participants reiterate the process of photon absorption and re-emission, explaining that re-emission can occur at the same frequency or in a cascade of photons.

Areas of Agreement / Disagreement

Participants generally agree on the complexity of atomic electron transitions and the variability of excited state lifetimes. However, there is no consensus on the specific details regarding the availability of charts or the interpretation of transition intervals.

Contextual Notes

The discussion highlights the dependence on definitions of excited state lifetimes and the lack of a singular answer for transition intervals across different elements. There are unresolved questions regarding the availability of specific data and the implications of transition lifetimes.

Who May Find This Useful

This discussion may be of interest to those studying atomic physics, spectroscopy, or anyone seeking to understand the behavior of electrons in atoms during photon interactions.

Symmetry777
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Are there any charts (information) concerning the elements and Atomic Electron Transition intervals? Does each element have a time it takes from absorption to the time of re-emission?

Concerning Spectral Lines are the result of interaction between a quantum system (atoms) and a single photon.

When a photon has about the right amount of energy to allow a change in the energy state of the system (in the case of an atom this is usually an electron changing orbitals, the photon is absorbed.

Then it will be re-emitted either in the same frequency as the original or in a cascade, where the sum of the energies of the photons emitted will be equal to the energy of the one absorbed (assuming the system returns to its original state).
 
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Symmetry777 said:
Are there any charts (information) concerning the elements and Atomic Electron Transition intervals? Does each element have a time it takes from absorption to the time of re-emission?
I guess you are after the lifetime of excited states. Each excited state has its own lifetime, so you won't get a single answer for a given element. In the NIST Handbook of Basic Atomic Spectroscopic Data, you will find Einstein coefficients for spontaneous emission (##A_{ik}##) for many excited states.

Symmetry777 said:
Concerning Spectral Lines are the result of interaction between a quantum system (atoms) and a single photon.

When a photon has about the right amount of energy to allow a change in the energy state of the system (in the case of an atom this is usually an electron changing orbitals, the photon is absorbed.

Then it will be re-emitted either in the same frequency as the original or in a cascade, where the sum of the energies of the photons emitted will be equal to the energy of the one absorbed (assuming the system returns to its original state).
Is there a question in there?
 
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Note that a lifetime does not mean that the transition cannot happen earlier. They is no "minimal waiting time".
 
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DrClaude said:
I guess you are after the lifetime of excited states. Each excited state has its own lifetime, so you won't get a single answer for a given element. In the NIST Handbook of Basic Atomic Spectroscopic Data, you will find Einstein coefficients for spontaneous emission (##A_{ik}##) for many excited states.Is there a question in there?
No, that was for clarity.
 

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