THE SPECTRUM OF DOUBLY IONIZED PRASEODYMIUM.
Spectroscopic rept. no. 22,
JOHNS HOPKINS UNIV BALTIMORE MD
Pagination or Media Count:
The spectrum of Pr2 PrIII produced by a low-energy spark discharge in helium was observed from 2025 A to 10716 A. The resulting line-list contains about 4,000 entries, some 1600 of which have been classified in an energy level scheme consisting of 118 odd and 130 even levels. Almost all the expected levels of the 4f3, 4f25d, 4f26p configurations have been located, as well as some levels of the 4f5d2 and 4f26d groups. The ground state of the ion was found to be the 4I92 level of the 4f3 configuration. The structure of the 4f26s and 4f26p groups indicate well developed J1j-coupling, while the remaining configurations were interpreted in terms of LS-coupling. An ionization potential of 23.2 volts was obtained from levels of the two member 4f2nd series. Author