Spontaneous emission intensities of AI and AII in the range 2500 Å to 11,500 Å have been obtained from 2-mm diameter capillaries operated at filling pressures between 0.45 and 5.0 torr and currents up to 10 amperes. Only the AII results at 0.6 torr and 5 amperes are reported here. The spectral sensitivity of the detection system was calibrated with a standard lamp, and the resolution was ≍1 Å. Effects of optical gain and absorption were verified to be negligible for AII.
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Miller et al. (1967) studied this question.