Emission spectral line intensity

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Discussion Overview

The discussion revolves around calculating the intensity of spectral lines using data from the NIST website, including parameters such as wavelength, Einstein coefficients, and energy levels. The scope includes theoretical and practical aspects of spectral line intensity in the context of atomic transitions.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant seeks guidance on calculating spectral line intensity using specific data parameters.
  • Another participant questions whether the inquiry pertains to the energy of photons released during atomic transitions.
  • A third participant clarifies that intensity relates to radiation emitted from electron transitions between energy states.
  • A further contribution specifies that absolute intensity refers to the number of photons emitted per unit time and raises questions about the number of atoms, their excitation, and the population of energy levels, while also distinguishing between relative and absolute intensity.

Areas of Agreement / Disagreement

Participants have not reached a consensus, and multiple viewpoints regarding the definition and calculation of intensity remain present.

Contextual Notes

Limitations include potential missing assumptions about atomic populations and excitation mechanisms, as well as the need for clarity on whether relative or absolute intensity is being discussed.

bejoynp
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Dear all

I need to calculate the intensity of the spectral line. I have data from NIST website:
wavelength, Aki (Einstein coefficient), gi, gk, Ei and Ek energy levels.

How do i go about

Thanks for your help
 
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Are you talking about the energy of the photon released from the atomic transition .
 
The intensity of the radiation emitted when an electron transitions from a higher energy state to lower
 
(Absolute) Intensity normally refers to photons per time.
So: how many atoms are there? How are they excited? Do you know the (average) population of the levels? Do you mean relative or absolute intensitiy?
 

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