The emission spectrum of the PH+ molecule

Narasimham, N. A. (1957) The emission spectrum of the PH+ molecule Canadian Journal of Physics, 35 (8). pp. 901-911. ISSN 0008-4204

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A system of three red degraded bands at 3854, 4228, and 3567 Å has been obtained in emission from a hollow cathode discharge through helium containing a little phosphorus vapor and hydrogen. Rotational analyses of the bands show that they are the 0–0, 0–1, and 1–0 bands of a 2Δ-2Π transition of the PH+ molecule. The 2Δ state is regular with small spin splitting (case b) while the 2Π state is regular with large spin splitting (case a). For ν=0, the F1 levels of the 2Δ state with N≥13 and the F2 levels with N≥15 are predissociated. Also the lines arising from the F1 levels of the 2Δ state with ν=1 are found to be extremely weak compared to those arising from the F2 levels. Vibrational and rotational constants have been determined and the dissociation energy has been found to be 3.06±0.25 ev.

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