High-resolution spectra of a 232ThI4/230ThI4 electrodeless discharge lamp were obtained from 5600 to 36000 cm−1 with a Fourier-transform spectrometer. The splittings of more than 2800 Th i isotopic doublets were measured to an accuracy of 0.001 cm−1. Level isotope shifts were determined for 274 even and 318 odd levels of Th i.
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Level value, configuration, term, and J taken from Ref. 9 with some corrections and modifications from Ref. 8. New levels are followed by an N and corrected levels or J’s by a C.
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 taken from Ref. 9 with some corrections and modifications from Ref. 8. New levels are followed by an N.
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 taken from Ref. 9 with some corrections and modifications from Ref. 8. New levels are followed by an N and corrected levels or J’s by a C.
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 taken from Ref. 9 with some corrections and modifications from Ref. 8. New levels are followed by an N.
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.