Jan Olof Ekberg, Jørgen E. Hansen, and Joseph Reader, "Analysis of the Spectrum of Six-Times-Ionized Niobium (Nb vii)," J. Opt. Soc. Am. 62, 1139-1142 (1972)
The spectrum of Nb vii has been observed in a sliding-spark discharge with a 5-m grazing-incidence spectrograph. The analysis has yielded nearly all levels of the 4p44d configuration that can combine with the 4p52P ground term. Seven of the eight levels of the 4p45s configuration given previously by Charles and by Chaghtai were confirmed. A new value was found for the eighth. The 4s24p44d+4s24p45s+4s4p6 level structure has been theoretically interpreted, with configuration-interaction effects included. The
level was found to have a 22% 4s24p4(1D)4d2S character and the
level a 20% 4s4p62S character. The energy parameters determined by a least-squares fit to the observed level values are compared with Hartree–Fock (HF) calculations. The ionization energy is estimated to be 118.9±0.7 eV.
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GC—established by Charles, Ref. 1, listed by Chaghtai, Ref. 2. Reestablished by Chaghtai, Ref. 2.
Not observed in present work; level value taken from Charles, Ref. 1.
Table III.
Calculated energy level values in cm−1 and percentage compositions for the 4s4p6, 4s24p44d, and 4s24p45s configurations of Nb vii. The 4p44d states are denoted by (S1L1)SL notation; the states of 4p45s are denoted by (S1L1J1,j) notation.
The values in parentheses are a measure of the amount of cancellation that has occurred in forming the integral. These numbers are the ratio of the true Rk value to an Rk value calculated using the absolute value of each wave function.
Tables (4)
Table I.
Classified lines of Nb vii. Intensities are visual estimates of photographic blackening.
GC—established by Charles, Ref. 1, listed by Chaghtai, Ref. 2. Reestablished by Chaghtai, Ref. 2.
Not observed in present work; level value taken from Charles, Ref. 1.
Table III.
Calculated energy level values in cm−1 and percentage compositions for the 4s4p6, 4s24p44d, and 4s24p45s configurations of Nb vii. The 4p44d states are denoted by (S1L1)SL notation; the states of 4p45s are denoted by (S1L1J1,j) notation.
The values in parentheses are a measure of the amount of cancellation that has occurred in forming the integral. These numbers are the ratio of the true Rk value to an Rk value calculated using the absolute value of each wave function.