Abstract
ALL emission bands previously attributed to the AlO molecule have been observed in the glow from a hollow cathode containing Al–Al2O3 pellets. The hollow cathode is a much more appropriate source for high-resolution studies than is the aluminium arc, and it is therefore gratifying that it may be used to excite materials as refractory as this one. Our discharge tube is quite similar to that described by Naudé and Hugo1 except that currents as high as 2 amp. were used. It has been employed with a 150,000-line Bausch and Lomb plane grating to record the green (A—X) bands of AlO in third order at a dispersion of 0.4 A./mm. and the ultra-violet bands in second and third orders. Effective resolving powers up to 200,000 have been achieved.
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References
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GOODLETT, V., INNES, K. Hollow-Cathode Emission of the AlO Spectrum. Nature 183, 243–244 (1959). https://doi.org/10.1038/183243a0
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DOI: https://doi.org/10.1038/183243a0
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