Abstract

Fourteen new spectral lines of Zr iv lying between 3200 and 4600 Å were observed with a sliding spark discharge and a 10.7-m normal-incidence spectrograph. The lines were classified as transitions between highly excited energy levels of this ion. The measured wavelengths provide improved values for the known energy levels as well as a value for the previously unknown 6h 2H term. Wavelengths with standard uncertainties varying from ±0.0005 to ±0.0018 Å were determined from the optimized level values for a group of lines between 445 and 1291 Å. An improved ionization energy was determined as 277 602.8±0.5 cm-1 (34.41837 ±0.00006 eV).

© 1997 Optical Society of America

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References

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  1. N. Acquista and J. Reader, “Spectrum and energy levels of triply ionized zirconium (Zr IV),” J. Opt. Soc. Am. 70, 789 (1980).
    [CrossRef]
  2. J. Reader and N. Acquista, “Spectrum and energy levels of doubly-ionized zirconium (Zr III),” Phys. Scr. 55, 310 (1997).
    [CrossRef]
  3. Unpublished wavelengths of Zr in hollow-cathode lamps measured by Fourier-transform spectroscopy, communicated privately by U. Litzén and S. Johansson, Lund University, Lund, Sweden, and R. Engleman, University of New Mexico, Albuquerque, New Mexico 87131.
  4. Uncertainty estimates are given at the level of one standard deviation.
  5. L. J. Radziemski, Jr., Washington State University, Pullman, Washington 99163 (personal communication, 1969). The procedure and definition of level-value uncertainties are described by L. J. Radziemski, Jr., and V. Kaufman, J. Opt. Soc. Am. 59, 424 (1969).
    [CrossRef]
  6. Conversion of the ionization energy from inverse centimeters to electron volts was done with the factor 8065.5410± 0.0024 cm−1/eV as given by E. R. Cohen and B. N. Taylor, Rev. Mod. Phys. 59, 1121 (1987).
    [CrossRef]

1997 (1)

J. Reader and N. Acquista, “Spectrum and energy levels of doubly-ionized zirconium (Zr III),” Phys. Scr. 55, 310 (1997).
[CrossRef]

1987 (1)

Conversion of the ionization energy from inverse centimeters to electron volts was done with the factor 8065.5410± 0.0024 cm−1/eV as given by E. R. Cohen and B. N. Taylor, Rev. Mod. Phys. 59, 1121 (1987).
[CrossRef]

1980 (1)

1969 (1)

Acquista, N.

J. Reader and N. Acquista, “Spectrum and energy levels of doubly-ionized zirconium (Zr III),” Phys. Scr. 55, 310 (1997).
[CrossRef]

N. Acquista and J. Reader, “Spectrum and energy levels of triply ionized zirconium (Zr IV),” J. Opt. Soc. Am. 70, 789 (1980).
[CrossRef]

Cohen, E. R.

Conversion of the ionization energy from inverse centimeters to electron volts was done with the factor 8065.5410± 0.0024 cm−1/eV as given by E. R. Cohen and B. N. Taylor, Rev. Mod. Phys. 59, 1121 (1987).
[CrossRef]

Kaufman, V.

Radziemski , Jr., L. J.

Reader, J.

J. Reader and N. Acquista, “Spectrum and energy levels of doubly-ionized zirconium (Zr III),” Phys. Scr. 55, 310 (1997).
[CrossRef]

N. Acquista and J. Reader, “Spectrum and energy levels of triply ionized zirconium (Zr IV),” J. Opt. Soc. Am. 70, 789 (1980).
[CrossRef]

Taylor, B. N.

Conversion of the ionization energy from inverse centimeters to electron volts was done with the factor 8065.5410± 0.0024 cm−1/eV as given by E. R. Cohen and B. N. Taylor, Rev. Mod. Phys. 59, 1121 (1987).
[CrossRef]

J. Opt. Soc. Am. (2)

Phys. Scr. (1)

J. Reader and N. Acquista, “Spectrum and energy levels of doubly-ionized zirconium (Zr III),” Phys. Scr. 55, 310 (1997).
[CrossRef]

Rev. Mod. Phys. (1)

Conversion of the ionization energy from inverse centimeters to electron volts was done with the factor 8065.5410± 0.0024 cm−1/eV as given by E. R. Cohen and B. N. Taylor, Rev. Mod. Phys. 59, 1121 (1987).
[CrossRef]

Other (2)

Unpublished wavelengths of Zr in hollow-cathode lamps measured by Fourier-transform spectroscopy, communicated privately by U. Litzén and S. Johansson, Lund University, Lund, Sweden, and R. Engleman, University of New Mexico, Albuquerque, New Mexico 87131.

Uncertainty estimates are given at the level of one standard deviation.

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Tables (3)

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Table 1 Newly Observed Long-Wavelength Spectral Lines of Zr iv

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Table 2 Energy Levels of Zr iv

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Table 3 Wavelengths of Selected Lines of Zr iv As Calculated from the Optimized Level Values

Equations (1)

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E(nl)=I0-TH(nl)-αdr-4nl-αqr-6nl,

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