The Y v spectrum has been observed in a sliding-spark discharge with the NBS 10.7-m normal-incidence vacuum spectrograph. The analysis has yielded all the levels of the 4p45s configuration and nearly all levels of 4p44d that can combine with the 4p5 2P ground term. The 4s24p44d + 4s24p45s + 4s4p6 levels have been theoretically interpreted, including configuration-interaction effects. The
level was found to have a 26% 4s24p44d(1D)2S character and the
level a 22% 4s4p6 2S character. The energy parameters determined from a least-squares fit of the observed level values are compared with Hartree–Fock calculations. The ionization energy is estimated to be 75.0 ± 0.5 eV.
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This estimated uncertainty applies to all 4s24p44d and 5s levels.
Table III
Calculated energy-level values in cm−1 and percentage compositions for the 4s4p6, 4s24p44d, and 4s24p45s configurations of Y v. The levels of the 4p44d configuration are designated in LS coupling; those belonging to 4p45s are designated in J1j coupling.
The values in parentheses are a measure of the amount of cancellation that has occurred in forming the integral. These numbers are calculated as the ratio of the true Rk value to an Rk value calculated by using the absolute value of each wave function.
Tables (4)
Table I
Classified lines of Y v. Intensities are visual estimates of photographic blackening.
This estimated uncertainty applies to all 4s24p44d and 5s levels.
Table III
Calculated energy-level values in cm−1 and percentage compositions for the 4s4p6, 4s24p44d, and 4s24p45s configurations of Y v. The levels of the 4p44d configuration are designated in LS coupling; those belonging to 4p45s are designated in J1j coupling.
The values in parentheses are a measure of the amount of cancellation that has occurred in forming the integral. These numbers are calculated as the ratio of the true Rk value to an Rk value calculated by using the absolute value of each wave function.