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Th-Ar lamp

This lamp gives a very rich emission line spectrum over a wide wavelength range and is thus very useful for high dispersion work, particularly in the red where the Cu-Ar and Cu-Ne ones are rather sparse. Our lamp produces very weak lines to the red of 7200 Å and long exposures are required which will produce the undesirable effect of overexposing the very strong Argon features. On the other hand, it is not recommended for medium and low dispersion work because of the severe problems which line-blending would introduce.

This is not a standard lamp, so users must notify their SA in advance for the lamp to be installed.

Wed Apr 6 22:56:39 BST 1994