Abstract

The emission spectrum of the A ¹Π–X ¹∑⁺ system of AlH, excited in a hollow-cathode discharge lamp, has been observed at high resolution with a Fourier-transform spectrometer. The rotational lines in the 0–0 and the 1–1 bands have been measured with a precision of ±0.001 cm⁻¹. The present measurements provide a considerable improvement over the previous data of Zeeman and Ritter [Can. J. Phys. 32, 555 (1954)]. The present data, combined with the previous high-resolution measurements of the 1–0 vibration–rotation band by White et al. [J. Chem. Phys. 99, 8371 (1993)] and the J = 1–0 pure rotational line of Goto and Saito [Astrophys. J. 452, L147 (1995)] have been used to determine improved molecular constants for the A ¹Π state.

© 1996 Optical Society of America

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