Abstract
The band spectrum of SrI is excited in a high frequency discharge through a mixture of heated strontium metal and iodine vapour, from a 1/2 kW oscillator working at a frequency of 30-40 MHz. High resolution spectrograms of SrI in the region lambda 6500- lambda 7200 have shown the existence of two doublet systems consisting of a number of well marked sequences of bands degraded to shorter wavelengths. The double-headed bands are analysed and attributed to A2 Pi -x2 Sigma and B2 Sigma -x2 Sigma transitions analogous to the A-X abd B-X systems of SrF, SrCl and SrBr molecules. The vibrational constants of the ground states and excited states and doublet intervals of analogous states of the isoelectronic molecules have been compared. The vibrational quantum formulae which represent the inner P1 and Q2 heads of the alpha 2 Pi -x2 Sigma system and P1 heads of the B2 Sigma -x2 Sigma system are given.
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