The spectrum of AlF in emission has been examined with moderate dispersion in the range 2000-7500 Å. Four systems have been found: (1) the system A 1 Π - X 1 Σ + at 2190-2360 Å, already known in absorption, (2) a system of violet-degraded bands, probably 3 Σ- 3 Π at 3450-3720 Å, (3) a complex system at 5450-6050 Å, and (4) a system of violet-degraded double-headed bands at 6670-7250 Å. The original vibrational analysis of system (1) has been amended and an analysis of system (2) has been completed. It has so far proved impossible to analyse systems (3) and (4), and it is not certain that AlF is the emitter of these systems. Emission bands previously ascribed to AlF by Yuasa have not been observed: it is suggested that these bands are in fact due to S 2 . The dissociation energy of AlF is briefly considered: a comparison of the thermochemical and spectroscopic values suggests that there may be a potential maximum in the state A 1 Π of AlF.
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Rowlinson et al. (1953) studied this question.
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