All Questions
8
questions
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Will an electron release energy when it is added into an atom for which electron affinity value is negative (endothermic)?
According to my understanding, when an electron is added into an atom, it emits energy in the form of photons because it is a form of de-excitation or relaxation. This is when electron affinity will ...
- 11
2
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1
answer
43
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What happens to light absorbed by a body with color?
As everyone knows, an object with color appears that way because it reflects its specific color(s). Textbooks tell us other colors are absorbed. Now, here's the question: what happens to the absorbed ...
0
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0
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24
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Stimulated emission semiclassical model for atom recoil
In the context of Saturated absorption spectroscopy, I'm having trouble modeling stimulated emission, and getting the result that is written in articles, such as this article. I tried to use a non-...
- 143
8
votes
2
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824
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How "wide" are absorption and emission lines?
There are various absorption lines that correspond to the difference in energy levels between electron orbits. E.g. the https://en.wikipedia.org/wiki/Lyman-alpha_line correpsonding to the difference ...
- 2,908
1
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1
answer
60
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Luminescence vs. X-ray emission
When a target atom is struck by some kind of radiation (for example, a $\text{MeV}$ proton), electrons from lower shells are kicked off and replaced by electrons from higher shells, which in return ...
- 35
0
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1
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44
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Radiation Emission due to High Temperatures?
We know that an object emits radiation at all temperatures above absolute zero.
But when an object is heated to high temperatures like the stars, Wouldn't it cause thermionic emission to take place?
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2
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2
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928
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Are there limits for photon energy?
Inspired by this question, I have slightly different question.
One way how photons are produced is through quantum oscillator transition from upper state $E_2$ to lower state $E_1$. The photon energy,...
- 1,194
3
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Estimating temperature with Boltzmann relation with split emission lines
I'm trying to estimate the temperature of a plasma through the use of hydrogen lines, $H_{\alpha}$ and $H_{\beta}$ using the Boltzmann relation:
$$ \frac{ n_{2} }{ n_{1} } = \frac{ g_{2} }{ g_{1} }e^...
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