This paper deals with the construction of a grating order sorter for high orders in a 5 m Fastie plane grating vacuum spectrograph. Some parts of the AlH and AlD spectra have been photographed in order to test the order sorter. A rather unique 1Π+ - 1Σ+ perturbation in AlD is discussed.
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Lagerqvist et al. (1970) studied this question.
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