From: Bob Higgins
The quadrapole mass spec RGA will have a front end ionizer to extract an ionized sample for measurement. I think this front end is likely to only extract positive ions and there will be no f/D+ because there is no such thing. AFAIK - Mass specs can be run in positive mode or negative mode. If an f/D- exists, I don't think it would be measured by the RGA. So, M/e=2 would have to be D+ or H2+. We need to know if they were running in positive mode before we can go that far. You could be right, but we do not have enough information. Robin may weigh in on redundant deuterons. To be honest, I had always marginalized the possibility of “deuterino deuteride” before Yoshino/Mizuno. The great allure of it, is that it explains things in a way that is hard to do otherwise. This is how Physics, or Fizzix, if you are in doubt - ended up with the “neutrino”. It was invented many years before it was found, simply to answer questions. Later it was actually found. Sometimes you can work backward from known results. There is no doubt that lots of people thought the neutrino was a stretch. A few still do. Nevertheless it is a case in point for using the best data fit and then working backwards from that by the process of elimination. Jones
