Natural SciencesPhysicsNuclear PhysicsPlasma PhysicsSpectroscopyFusion PlasmasHigh-temperature PlasmasForbidden Emission LinesTokamak PhysicsTokamak Plasmas
A survey is given of the numerous forbidden lines that have recently been discovered in the spectra of tokamak plasmas. They represent magnetic-dipole transitions in three different groups of configurations: 2s2p and 2s22pk (k = 1–5), 3s3p and 3s23pk (k = 1–5), and 3dk (k = 1, 2, 8, 9). In the first group (n = 2) a total of 62 lines have been reported for Z = 21–32, in the second group 65 lines (some of which are given as tentative) for Z = 29–42, and in the 3dk group 8 lines for Z = 40, 42. The identifications in the n = 2 configurations have all been confirmed in elaborate isoelectronic studies of the transition energies. A corresponding investigation of the intervals in the second and third group of configurations is hampered by lack of suitable theoretical data, but provisional checks on the isoelectronic consistency of the identifications are presented.
15