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There is a lot more to the hydrogen spectrum than the three lines you can see with the naked eye. I have chosen to use this photograph anyway because a) I think it is a stunning image, and b) it is the only one I have ever come across which includes a hydrogen discharge tube and its spectrum in the same image.Įxtending hydrogen's emission spectrum into the UV and IR The red smearing which appears to the left of the red line, and other similar smearing (much more difficult to see) to the left of the other two lines probably comes, according to Dr Nave, from stray reflections in the set-up, or possibly from flaws in the diffraction grating. Ideally the photo would show three clean spectral lines - dark blue, cyan and red. If you are interested in more than an introductory look at the subject, that is a good place to go. The photograph comes from notes about the hydrogen spectrum in his HyperPhysics pages on the University site.

Note: This photograph is by courtesy of Dr Rod Nave of the Department of Physics and Astronomy at Georgia State University, Atlanta. This is caused by flaws in the way the photograph was taken. (Ignore the 'smearing' - particularly to the left of the red line. The photograph shows part of a hydrogen discharge tube on the left, and the three most easily seen lines in the visible part of the spectrum on the right. Most of the spectrum is invisible to the eye because it is either in the infra-red or the ultra-violet. What you would see is a small part of the hydrogen emission spectrum. If the light is passed through a prism or diffraction grating, it is split into its various colours. If you put a high voltage across this (say, 5000 volts), the tube lights up with a bright pink glow. It also looks at how the spectrum can be used to find the ionisation energy of hydrogen.Ī hydrogen discharge tube is a slim tube containing hydrogen gas at low pressure with an electrode at each end.

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private meeting rooms, video and tele-conferencing, business centre services, with free high-speed wireless internet access and power point at every seat to charge your gadgets.This page introduces the atomic hydrogen emission spectrum, showing how it arises from electron movements between energy levels within the atom.

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