# Emission spectral line intensity

• bejoynp
In summary, the conversation discusses the calculation of the intensity of a spectral line using data from the NIST website. The speaker also asks for clarification on the concept of intensity and inquires about the number of atoms, their excitation, and the population of energy levels.
bejoynp
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.

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?

,

I would suggest using the formula for spectral line intensity, which is given by I = (Aki * gi * Nk * hc) / (4π * λ^2). Here, Aki is the Einstein coefficient, gi and gk are the statistical weights of the initial and final energy levels, Nk is the number of atoms in the final energy level, λ is the wavelength, and hc is the product of Planck's constant and the speed of light.

To calculate Nk, you can use the Boltzmann distribution which relates the number of atoms in each energy level to the energy difference between the levels. You can also use the data from the NIST website to determine the energy difference between the levels (Ek - Ei).

Once you have all the necessary values, you can plug them into the formula and calculate the intensity of the spectral line. Keep in mind that the intensity will be dependent on the number of atoms in the final energy level, so make sure to consider this in your calculations.

I hope this helps and good luck with your calculations! Don't hesitate to reach out if you need further assistance.

## 1. What is emission spectral line intensity?

Emission spectral line intensity refers to the amount of light emitted at a specific wavelength by a substance, such as a gas or plasma. It is a measure of the strength of the emission line in a spectrum.

## 2. How is emission spectral line intensity measured?

Emission spectral line intensity is usually measured using a spectrophotometer, which separates light into its component wavelengths and measures the intensity at each wavelength. The intensity is typically reported in units of energy or power per unit area per unit wavelength.

## 3. What factors affect emission spectral line intensity?

Several factors can affect emission spectral line intensity, including the temperature and density of the emitting substance, the composition of the substance, and the energy state of the emitting atoms or molecules. Additionally, the intensity of the excitation source and the path length of the light through the substance can also impact the emission line intensity.

## 4. How is emission spectral line intensity used in research?

Emission spectral line intensity is an important tool for studying the properties of substances, such as their composition and temperature. It is commonly used in fields such as astronomy, chemistry, and materials science to identify and analyze the composition of objects and materials.

## 5. Can emission spectral line intensity be used to determine the chemical identity of a substance?

Yes, emission spectral line intensity can be used to identify the chemical elements present in a substance. Each element has a unique set of emission lines, so by measuring the intensities of these lines, scientists can determine the elements present in a sample. However, emission spectral line intensity alone may not be enough to determine the chemical identity of a substance, as other factors such as temperature and density can also influence the spectral lines.

Replies
0
Views
906
Replies
5
Views
2K
Replies
1
Views
976
Replies
17
Views
4K
Replies
4
Views
2K
Replies
5
Views
2K
Replies
15
Views
3K
Replies
5
Views
6K
Replies
4
Views
2K
Replies
8
Views
3K