One further point Lou. You wrote: > I also wish that other spectral anomalies were observed - besides the broadband soft X-ray/EUV apparently due to hydrogen, but I believe that the 19.29 nm line is due to the oxidized cathode/anode surfaces - oxygen contamination.
Yes - this line is close to a known emission/absorption line of oxygen/ozone... which explains why the strongest solar UV is absorbed before reaching the earth's surface - due to oxygen in the stratosphere. We would not be here otherwise. But several obvious facts make me think that most of energy represented by this line (and the extreme spike in the charts) - will not be related to oxidation of electrodes. (a small percentage could be related). First - good experimenters are not that careless with their apparatus to allow significant oxidation. Second is the large proportion of net energy allocated to that line. Third is the fact that electrodes are generally chosen and manufactured not oxidize. Fourth is the lack of expected signal at the Rydberg level when all of that hydrogen is present. Fifth is that the hydrogen in the experiment would reduce any electrode oxidation (clean the electrode) so the net residual would be tiny. Sixth is cosmological- the lack of oxygen on the sun despite the sun's strong 19.3 signal. Taken together, this facts indicate that this line represents far more than a relic of oxygen. Our sun is a massive source of 19.3 nm UV, once the observer gets out of the earth's atmosphere. Given that Hydrogen represents 91.2% of all atoms on the sun and oxygen accounts for only 8 atoms per every 10,000 it is almost unimaginable to me that the strong 19.3 nm line is due primarily to oxygen. There must be another large source. (but again, oxygen could be partly responsible - a few percent) In the present RPF hypothesis, this line is mostly due to reversible P+P fusion to 2He (the diproton) which immediately reverses back to two protons, with QCD supplying the UV photon release and more. Indeed, several other UV and soft x-ray lines may result from RPF and QCD interaction. So the solar model is a complicated situation - made even more complicated by the fact that solar RPF reactions could be balanced between exotherm and endotherm. (the internal UV photons are absorbed and not re-emitted) Thus the net energy released from the sun may not be augmented to a large degree - by energy represent in this UV line, or more likely - slightly augmented. Jones