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sheenarbw
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I've been looking everywhere for information on the absorption spectra of molecular hydrogen. I need some pretty exact numbers. If anybody can point me in the right direction it would be greatly appreciated.
sheenarbw said:Thanks SpectraCat!
Just a quick one, brace yourself, this question mught be a bit retarded...
How do those tables work?
I was hoping to find something like a list of constants associated with a list of frequencies.
Here's the formula i was hoping to plug the values into:
If= Io exp(-k(f)nx)
If=incident intensity
Io=original intensity
n=atoms per unit vol
x=distance
k(f) = the stuff I've been searching everywhere for
sheenarbw said:Thanks again SpectraCat
I'm not really sure how to answer that question, maybe if i just tell you what I'm planning on doing with the information you can help me figure it out?
Pretty much what i want to do is have a laser that works at a frequency that is well absorbed by hydrogen pointed, via a whole lot of almost pure hydrogen gas (from a pipeline), at a photodetector. So, looking at that formula, I can get readings for Io and If, I'll also know the distance and k(f). I want to have a way of getting n.
It's an exercise in electronics more than anything else (i need to make sure that there is no way in heck the associated circuit would spark or heat up too much).
I don't really know much about transitions...
sheenarbw said:I haven't decided yet, something infrared would be best i think. I can get a tunable laser if need be
sheenarbw said:And i just read that the smallest IR wavelength that can be absorbed by hydrogen is 823.5nm. I'm not really sure of the maths because I've never done the calculation myself, if you want to check it out it's here:
http://www.goiit.com/posts/list/modern-physics-largest-wavelength-in-the-uv-region-of-hydrogen-921737.htm
An absorption spectrum is a graphical representation of the wavelengths of light that are absorbed by a substance. It shows the specific wavelengths at which a substance absorbs light, and can be used to identify the substance or study its properties.
The absorption spectrum of molecular hydrogen is important because it provides information about the energy levels and transitions of hydrogen atoms. This is useful in various fields such as astronomy, where the presence of hydrogen can be detected through its absorption spectrum in the light from stars and galaxies.
The absorption spectrum of molecular hydrogen can be measured using spectroscopy, which involves passing a beam of light through a sample of hydrogen gas and measuring the intensity of light that is transmitted at different wavelengths. The resulting graph of intensity versus wavelength is the absorption spectrum.
The gaps or lines in the absorption spectrum of molecular hydrogen represent the specific wavelengths of light that are absorbed by hydrogen atoms as they transition between energy levels. These lines are unique to hydrogen and can be used to identify the presence of hydrogen in a sample.
The temperature of a gas can affect the absorption spectrum of molecular hydrogen by altering the energy levels and transitions of the hydrogen atoms. At higher temperatures, the atoms have more energy and can transition to higher energy levels, resulting in a shift in the absorption lines towards shorter wavelengths.