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Cu-He 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.

Wed Apr 6 22:56:39 BST 1994