Analysis of the Spectrum of Singly Ionized Samarium

Abstract

view Abstract Citations (29) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Analysis of the Spectrum of Singly Ionized Samarium Albertson, Walter Abstract Over 1200 lines of Sa II are shown to result from transitions between 41 low, even levels and more than 200 middle and high, odd levels. Tables of classified lines and of the energies, excitation potentials, and experimental g-values of the terms are pre- sented. The normal electron configuration is 4f6(7F)6s, which gives the low multiplets a8F and a6F. Transitions to these levels accou~nt for nearly every intense line from the blue-green to the ultra-violet. The configuration ~if6(7F)5d gives the pentad 8HGFDP, transitions to which account for all the intense lines from the infra-red to the blue-green. Thus transitions to terms built on the parent-term g6(7F) account for nearly the whole of the intensity of radiation of Sa ii. L, S, and J assignments to these levels are checked by experimental g-values from Zeeman patterns of over 300 lines. The low levels show good intervals, and experimental g-values are identical with Russell-Saunders coup]irig values; but since high leveLs give evidence of wide departure from Russell-Saunders coupling, L- and S-values cannot be assigned to them. The levels of 4f6(7F)5d8H show the largest hyperfine-structure splitting. The close relation between San and Eu 11 structures is noted. The I.P. of Sa ii is estimated to be near 11.4 volts. The types of rare-earth spectra and normal electron configurations are discussed. Eighty-eight lines of Sa II, belonging to seven different multiplets, have been identi- fied in the spectrum of the sun. Calculations by Amelia Frank show that Merrill's vector-model theory holds quite well for the levels of 4f6(7F)6s Publication: The Astrophysical Journal Pub Date: July 1936 DOI: 10.1086/143749 Bibcode: 1936ApJ....84...26A full text sources ADS | Related Materials (1) Reprint: 1936CMWCI.546....1A