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Re: 6v6 Tube blue gas show


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8/1/2000 5:55 PM
Chris Harden
 Re: 6v6 Tube blue gas show
You're completey right, I have studied emission and absorbtion spectra in enough detail to realise that I just didn't read your post enough detail, and although I had considered this effect, I didn't pay it enough attention for some reason. What it would be interesting to do is to view the emitted light through a diffraction grating, then try to match the spectra with known gases to find out which are present in the tube.  
 
Thankyou for putting me straight. I've only just finished A level physics (I should have an A when I get the results in two weeks) so I shouldn't have made such mistakes. It'll teach me to think more about what I am doing  
 
Chris
  
8/1/2000 11:10 PM
Brian
Molecules absorb energy which bounces their electrons up to higher energy states. Moleclues can only emit at certain frequencies, and this is different for each molecule. I have studied the energy level diagram too many times!  
 
The energy of one electron doesn't dictate the frequency of light that will come from a molecule. The electron bounces off the molecule, which means that it still has a lot of energy on its own, although it is moving slower. This makes the operation of the tube less efficient, which is why they do it in a vacuum in the first place. Otherwise the tube would just be a light bulb.  
 
(btw- this is what they use in a lot of UV/Visible spectrophotometers, a deuterium bulb which emits light strongly down to about 200nm -- it is just a plate and a cathode in a tube with deuterium (heavy hydrogen) gas.  
 
I can't remember the equations either, but I do remember that h is 6.626*10^-34 J*s and e is -1.6*10^-19 C. :)  
 
BT
  
8/1/2000 11:53 PM
MBSetzer
Seems to me if the gas is glowing it would most likely be nitrogen.  
 
The silicon in the glass can sometimes glow blue also.  
 
Where is Dr. Nuke and his on-line document on this subject?  
 
Mike
  

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