The Zn i 4s4p3P°–4p2 3P multiplet (2070–2105 Å) was remeasured on spectrograms from 10.7-m grating spectrographs. The new wavelengths are used to determine improved values for the 4p2 3P levels. Predicted positions and percentage compositions for the unknown 4p2 1D2 and 1S0 levels are calculated in a pure-configuration approximation. These results are combined with our measurement of the autoionization width for the 3P2 level, to obtain a predicted autoionization probability of 1.3×1015 s−1 for the 1D2 level. The autoionization probability for the 1S0 level is similarly estimated to be <3×1013s−1. Wavelengths are given for five new Zn i transitions (2040–2053 Å) from unknown autoionizing levels, probably belonging to the 4p4d configuration.
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Estimated relative intensities from an arc between zinc electrodes. The arcs were run through ~1 atm of helium at currents of ~2 A. Similar intensities were observed in sliding-spark discharges. Reversed lines are indicated by R, and autoionization-broadened lines by w (wide) or W (very wide).
Estimated relative intensities from a water-cooled hollow-cathode source with helium carrier gas at ~5 torr. The current was 0.45 A. The hollow cathode was a 6-mm-i.d. copper cylinder, lined inside with zinc except at the closed end.
We have no explanation for the enhancement of this line in the HC source. The greatest enhancement (at least a factor of 10) occurred at the lowest pressures used (~1 torr) in either helium or neon. The statistical intensities of 2097 and 2079 Å would be equal, in agreement with the observed intensities in the sliding-spark sources. Note that in the arc the 2079-Å line is somewhat stronger than 2097 Å. It appears that some process in the HC discharge preferentially populates 4p2 3P0 relative to 3P1. We believe that all of the measurements in this table were made on unblended Zn i lines. Most of these lines appear in the list of K. A. Dick [“The Spark Spectra of Zinc,” Ph.D. thesis, University of British Columbia, 1966.] Three (including 2097 Å) were classified as Zn iii, and would thus be blends in his list. Zn iii was not present in our arc or hollow-cathode sources.
Previously listed as an unclassified Zn ii line [A.M. Crooker and K. A. Dick, Can. J. Phys. 46, 1241 (1968); W. C. Martin and V. Kaufman, J. Res. Natl. Bur. Std. (U. S.) 74A, 11 (1970)].
Table II
Values of F2(4p,4p) in three configurations (unit is cm−1). The headings “Obs.” and “H.F.” refer to observed and Hartree–Fock values. Extrapolations for Zn i are in parentheses.
Obs.
H. F.
H. F./Obs.
Ge i 3d104s24p2
1027
1404
1.37
Ga i 3d104s4p2
955
1218
1.27
Zn i 3d104p2
(885)
1037
(1.17)
Table III
Intermediate-coupling calculation for Zn i 4p2 1D2 and 1S0 levels. Parameter values were F2 = 885 cm−1, ζ = 408 cm−1. Possible configuration interaction complicates an estimate of the uncertainties (see text).
Estimated relative intensities from an arc between zinc electrodes. The arcs were run through ~1 atm of helium at currents of ~2 A. Similar intensities were observed in sliding-spark discharges. Reversed lines are indicated by R, and autoionization-broadened lines by w (wide) or W (very wide).
Estimated relative intensities from a water-cooled hollow-cathode source with helium carrier gas at ~5 torr. The current was 0.45 A. The hollow cathode was a 6-mm-i.d. copper cylinder, lined inside with zinc except at the closed end.
We have no explanation for the enhancement of this line in the HC source. The greatest enhancement (at least a factor of 10) occurred at the lowest pressures used (~1 torr) in either helium or neon. The statistical intensities of 2097 and 2079 Å would be equal, in agreement with the observed intensities in the sliding-spark sources. Note that in the arc the 2079-Å line is somewhat stronger than 2097 Å. It appears that some process in the HC discharge preferentially populates 4p2 3P0 relative to 3P1. We believe that all of the measurements in this table were made on unblended Zn i lines. Most of these lines appear in the list of K. A. Dick [“The Spark Spectra of Zinc,” Ph.D. thesis, University of British Columbia, 1966.] Three (including 2097 Å) were classified as Zn iii, and would thus be blends in his list. Zn iii was not present in our arc or hollow-cathode sources.
Previously listed as an unclassified Zn ii line [A.M. Crooker and K. A. Dick, Can. J. Phys. 46, 1241 (1968); W. C. Martin and V. Kaufman, J. Res. Natl. Bur. Std. (U. S.) 74A, 11 (1970)].
Table II
Values of F2(4p,4p) in three configurations (unit is cm−1). The headings “Obs.” and “H.F.” refer to observed and Hartree–Fock values. Extrapolations for Zn i are in parentheses.
Obs.
H. F.
H. F./Obs.
Ge i 3d104s24p2
1027
1404
1.37
Ga i 3d104s4p2
955
1218
1.27
Zn i 3d104p2
(885)
1037
(1.17)
Table III
Intermediate-coupling calculation for Zn i 4p2 1D2 and 1S0 levels. Parameter values were F2 = 885 cm−1, ζ = 408 cm−1. Possible configuration interaction complicates an estimate of the uncertainties (see text).
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