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The Spectrum and Term System of P IV

The spectrum of triply ionized phosphorus has been studied in the wavelength region 200-9 800 Å by using a sliding spark in vacuum. Some 590 lines are classified, about 530 of which had not been classified before. Most of the terms are new, and the term system has been recalculated. Many intersystem combination lines fix the singlet and triplet systems relative to each other. The ionization energy has been derived by means of a polarization formula applied to terms of the 3snh, 3sni and 3snk series, yielding the value 414 922.8±1.0 cm-1.