Abstract
One of the most important items of equipment necessary for atomic absorption spectroscopy (1-3) is the hollow cathode lamp. Of all light-sources available, it has been found to give the narrowest spectral lines with reasonable intensity, and it has the added advantage that it also provides very constant light output. Several types of hollow-cathode lamps have been developed in the past. The gas circulating system described by Tolansky (4) is not necessary, since sealed off hollow cathode tubes have successfully been made (2, 5). In these cases efficient outgassing of tubes has been achieved by the use of getters, but Walsh (6) has shown that, provided pure gas is used and careful outgassing of the tube is achieved, the use of a getter is not essential. Zeeman and Butler (7) described a lead lamp with a water cooled cathode, which could be dismantled. This lamp proved to be so successful that a similar type of lamp, using other cathodes which were not watercooled, was designed and built. In Fig. 1 a diagram of this new type of lamp is shown.
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