Evans found that the 4686 series and the Pickering series can be obtained in a helium spectrum showing no trace of the ordinary hydrogen lines. These series were observed a few years ago by Prof.

How about being able to see things normally completely outside the visual spectrum, like hydrogen combustion or ... entirely outside of the normal visible spectrum – in other words, seeing ...

MANY examples of changes in ultra-violet absorption spectra attributable to hydrogen bonding have been reported and summarized by Ito 1. However, in few of these cases has the change in ...

Hot gases don’t produce a continuous emission spectrum. Black hydrogen absorption lines are at the same wavelength as the bright hydrogen emission lines. Key fact Line emission spectra are ...