Why don’t spectrometers cover the entire EM wavelength range? Or at least extreme ultraviolet, through visible and near inferred, to inferred. It’s not fair that I can have the line of sight I want but the spectrometer fitted to it misses emission line by 50Å. And, of course, it should have a resolution of at least 0.1nm across the entire spectrum so you can tell the difference between lines from hydrogen and the same line from deuterium and tritium.
Is that really so much to ask?





















