Neon (90%) Helium (10%) line spectrum

Neon (90%) Helium (10%) line spectrum produced by the Model 629 hollow cathode lamp measured with 200mm focal length McPherson Model 234/302 monochromator and scintillated photomultiplier-tube detector assembly, Model 658. The spectrum shows multiple diffracted orders, eg. the strong Ne lines at ~73nm appear at ~145nm as well.

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