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The Classification of Transitions between Levels of Principal Quantum Numbers 2 and 3 in S X to XIV and of Isoelectronic Spectra in P, Cl and Ar

Emission lines which result from transitions betwen principal quantum numbers 2 and 3 in S X to XIV P X to XII, Cl XI to XIV and Ar XII and XIII are classified. The spectra were emitted from the plasma produced in a theta-pinch into which a small quantity of hydrogen sulphide, phosphine, chlorine or argon was added. Wavelength measurements in sulphur have an accuracy of ±0.005 A. The data allow improved isoelectronic extrapolations to the spectra of Fe XX to Fe XXIV which are observed on solar flare spectrograms.