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Previous: Th-Ar lamp
Up: Comparison lamps
Next: Al/Ca/Mg-Ne lamp
Previous Page: Th-Ar lamp
Next Page: Al/Ca/Mg-Ne lamp
The spectrum is that of pure HeI with some contamination by very weak hydrogen; copper lines are not seen.
Between 3800 Å and 5050 Å it has 12 well defined lines which makes it
useful at low dispersion. Between 5875 Å and 7281 Å the spectrum contains
4 strong emission lines, while beyond 7282 Å only a few weak lines are
present. The only strong feature in the far red is the line at
10830.3 Å .
Apart from this far red line, the lamp could be useful in combination with
another one to fill gaps (e.g. Cu-Ar) or for very low dispersion
spectroscopy with FOS.
This is not a standard lamp, so users must notify their SA in advance for it to be installed.