Rolf Engleman and Byron A. Palmer, "Precision isotope shifts for the heavy elements. III. Singly ionized thorium (Th ii)," J. Opt. Soc. Am. B 1, 782-787 (1984)
High-resolution Fourier-transform spectra of a 232ThI4–230ThI4 electrodeless discharge lamp were obtained between 5600 and 36 000 cm−1. These spectra were used to measure the splittings of more than 800 isotopic Th ii doublets to an accuracy of about 0.001 cm−1. From these isotope shifts, 184 even- and 167 odd-level isotope shifts were determined. Level isotope shifts were determined for all known levels below 20 000 cm-, except for the even J = ½ level at 19 594 cm−1. An empirical correlation of the level isotope shifts with a theoretical, configuration-mixing calculation was used to derive pure-configuration level isotope shifts.
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Level value, configuration, term, and J value taken from Ref. 6 with some corrections and modifications from Ref. 5.
Those configurations marked with *’s are f2d +fdp configurations.
Isotope shifts are in units of millikaysers, and the differences are between the corresponding 232Th and 230Th energy levels. The first level was assigned an isotope shift of 0.0 mK. A ? following the isotope shift denotes a probable error of 10 mK or more.
This is the number of line isotope shifts used in obtaining the level isotope shift with the least-squares procedure. Inclusion of this value in parentheses indicates that the level isotope shift was not determined by least squares.
Level value, configuration, term, and J taken from Ref. 6 with some corrections and modifications from Ref. 5.
Isotope shifts are in units of millikaysers, and the differences are between the corresponding 232Th and 230Th energy levels. A ? following the isotope shift denotes a probable error of 10 mK or more.
This is the number of line isotope shifts used in obtaining the level isotope shift with the least-squares procedure. Inclusion of this value in parentheses indicates that the level isotope shift was not determined by least squares.
Level value, configuration, term, and J value taken from Ref. 6 with some corrections and modifications from Ref. 5.
Those configurations marked with *’s are f2d +fdp configurations.
Isotope shifts are in units of millikaysers, and the differences are between the corresponding 232Th and 230Th energy levels. The first level was assigned an isotope shift of 0.0 mK. A ? following the isotope shift denotes a probable error of 10 mK or more.
This is the number of line isotope shifts used in obtaining the level isotope shift with the least-squares procedure. Inclusion of this value in parentheses indicates that the level isotope shift was not determined by least squares.
Level value, configuration, term, and J taken from Ref. 6 with some corrections and modifications from Ref. 5.
Isotope shifts are in units of millikaysers, and the differences are between the corresponding 232Th and 230Th energy levels. A ? following the isotope shift denotes a probable error of 10 mK or more.
This is the number of line isotope shifts used in obtaining the level isotope shift with the least-squares procedure. Inclusion of this value in parentheses indicates that the level isotope shift was not determined by least squares.