The spectrum of S V has been studied in the region 130-7800 A by means of a sliding vacuum spark. About 385 lines have been identified, 330 of which are new, and many new terms have been established. Some 30 intersystem lines have been found, fixing the triplet system relative to the singlet system. By means of a polarization formula applied t o the 3snh and 3sni series the.ionization limit is derived to be 585514.1 t 1.0 cm-' .
New observations in the spectrum of P III have been made in the wave-length region 200-9 800 Å by using a sliding spark in vacuum. The term system now includes 58 complete terms, 36 of which are new and some more completed or resolved. It is based on about 640 spectrum lines, some 530 of which are newly classified. About 10% of the lines are intercombinations fixing the quartet and doublet systems relative to each other. The whole system has been recalculated on the basis of the new measurements. The energy of the lowest ionization limit has been deduced from a polarization formula applied to the nh
2
H series, giving the value 243 600.7±0.7 cm-1.
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.
New observations in the P II spectrum have been made in the wavelength region 500-12 000 Å. The spectrum was excited in two different ways, using a high-frequency lamp and a sliding spark in vacuum. The term system now includes 159 levels and about 900 identified lines, which means a doubling of the number of levels and identified transitions. The energy of the lowest limit, 3s2 3p 2P, is derived from ng-series, which are all new. A linear Ritz formula gives the value 160 010.6 cm-1 for the 2P3/2 component of the limit, and the ground term splitting 559.14 cm-1 in P III then gives 159 451.5 cm-1 for the 2P1/2 limit level.
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