Questions tagged [emission]
The emission tag has no usage guidance.
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References for recommendation guidline values (cyclic hydrocarbons and i-alcylated hydrocarbons)
I am studying a measurement protocol of VOC emissions of a rubber gym flooring product and stumbled over some substances I didn't found any guideline values such that below this value it seems to be ...
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How can I set up and process my excitation-emission matrices properly?
I'm running EEMS on some water samples on a Horiba Fluoromax 4 spectrofluorometer. Method below.
$\pu{240-580nm}$ emission, $\pu{5nm}$ interval, $\pu{1nm}$ width.
$\pu{240-480nm}$ excitation, $\pu{...
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563 views
Does all fire only emit light on its outermost shell?
This question is about light emission, which may overlap with physics, but I am most interested in combustion and types of flame (incandescence, petrochemical fuel flames, nuclear ractions).
Consider ...
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48 views
Thermionic Emission Conservation of Energy
I am learning about thermionic emission and how it led to the vacuum tube. It is said that thermionic emission was a way to increase the flow of electrons from a signal (e.g. in a radio receiving a ...
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1answer
294 views
Absorption and emission at same wavelength?
Is it possible for a molecule to absorb and emit at the same wavelength? What is the reason behind it?
I’m working on charged tin porphyrins and got the excitation and emission (fluorescence) ...
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What type of spectroscopy can display several vibrational energy levels around the electronic transition?
My question is illustrated as the figure. As far as I know, due to the Franck-Condon principle, the absorption spectrum is related to the ground state to the excited state with the same geometry. Here ...
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How to think about absorption and emission rates and intensity for stimulated emission?
I learned Fermi's Golden Rule applied to absorption and stimulated emission and encountered the following question:
Since absorption and emission rates are the same for stimulated emission, why can't ...
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1answer
36 views
Photodissociated iodine laser and population inversion
Iodine molecules ($\ce{I2}$) can absorb in the visible region and dissociate into $\ce{2 I^.}$ radicals. One of the I atoms is in ground electronic state $\mathrm{^2P_{3/2}}$ and the other I atom is ...
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Detectable elements using flame AES
I've been looking for extra information concerning flame atomic emission spectroscopy. I need a clear overview of which elements are detectable with this technique, but I can't find anything because ...
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32 views
Temperature dependence of emission lines from gases, for example, neon
Emission lines from Ne are frequently used as wavelength standards in spectroscopy. Reading around Wikipedia, I found about the Paschen law regarding the voltage required to start a discharge.
My ...
