P. G. Wilkinson and K. L. Andrew, "Proposed Standard Wavelengths in the Vacuum Ultraviolet. Spectra of Ge, Ne, C, Hg, and N†," J. Opt. Soc. Am. 53, 710-717 (1963)
The spectrum emitted from a germanium hollow-cathode discharge was photographed at high dispersion in the third order of a 21-ft concave grating spectrograph. Emission lines of Ge II, Ne II, Hg I, Hg II, C I, and N I were measured against Ge I Ritz standards in the regions 1550–2041 Å and 2325–3060 Å. The Ge I Ritz standards were investigated as to their suitability, and it was found that 56 lines in the region 1650–2041 Å may be used with confidence to ±0.0004 Å. Fifty-eight interpolated lines of Ne, Hg, C, N, and Ge may be used as auxiliary standards to ±0.001 Å in the region 1550–2041 Å. The interpolated measurements in the region 2325–3030 Å provide 74 lines with a standard error of ±0.002 Å which also may be useful. The present investigation of the Ge ii spectrum has provided revised energies for 15 levels. From these levels and 12 additional levels from the recent work of Kaufman and Andrew, the wavelengths of 22 lines in the region 837–1602 Å have been calculated with an estimated uncertainty of ±0.0004 to ±0.0018 Å.
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Ge i Ritz or interferometric standards used to measure all other lines.
Line coincides with line from another order and cannot be used as a standard here. However, this line can be used when working in the first order.
Line too weak to serve as a reliable standard since it does not appear in an exposure time of 30 min.
Unsymmetrical line. Line is not suitable as a standard.
No reason can be given for the discrepancy between the Ritz calculation and the grating measurement. Line is not suitable as a standard.
Table II
Wavelength measurements on the natural Hg i line, 6s2 1S0–6p1P10 in absorption.
The uncertainties given are the sum of the estimated uncertainties in the grating measurements and the interferometric measurements.
Levels involving the grating measurements of Table III.
Levels determined by the interferometric work of V. Kaufman and K. L. Andrew, J. Opt. Soc. Am. 52, 1223 (1962). The value for
cm−1 (grating measurement) is taken as the starting point.
Table V
Vacuum ultraviolet wavelengths of Ge ii calculated from the energy levels of Table IV.
These intensities are those given in V. Kaufman and K. Andrew, J. Opt. Soc. Am. 52, 1223 (1962), and are those observed by A. G. Shenstone.
Intensities given in C. Moore-Sitterly, “An Ultraviolet Multiplet Table,” National Bureau of Standards Circ. 488 (1952).
Table VI
Multiplet of C i at 1656 Å, 2p2 3P–3s3P0.
Intensity
λ (Å)
ν (cm−1)
J
Intervals (cm−1)
3P1–3P0
3P2–3P1
3P10–3P00
3P20–3P10
68
1657.3783
60 336.255
1–1
16.33
27.04
19.23
40.45
105
1658.1213
60 309.219
2–1
105
1656.9298
60 352.587
0–1
100
1656.2680
60 376.702
1–2
26.96
40.53
500
1657.0078
60 349.746
2–2
90
1657.9066
60 317.029
1–0
Tables (6)
Table I
Wavelengths of identified lines.
Intensity
Average wavelength from grating measurements Å (air)
Ge i Ritz or interferometric standards used to measure all other lines.
Line coincides with line from another order and cannot be used as a standard here. However, this line can be used when working in the first order.
Line too weak to serve as a reliable standard since it does not appear in an exposure time of 30 min.
Unsymmetrical line. Line is not suitable as a standard.
No reason can be given for the discrepancy between the Ritz calculation and the grating measurement. Line is not suitable as a standard.
Table II
Wavelength measurements on the natural Hg i line, 6s2 1S0–6p1P10 in absorption.
The uncertainties given are the sum of the estimated uncertainties in the grating measurements and the interferometric measurements.
Levels involving the grating measurements of Table III.
Levels determined by the interferometric work of V. Kaufman and K. L. Andrew, J. Opt. Soc. Am. 52, 1223 (1962). The value for
cm−1 (grating measurement) is taken as the starting point.
Table V
Vacuum ultraviolet wavelengths of Ge ii calculated from the energy levels of Table IV.
These intensities are those given in V. Kaufman and K. Andrew, J. Opt. Soc. Am. 52, 1223 (1962), and are those observed by A. G. Shenstone.
Intensities given in C. Moore-Sitterly, “An Ultraviolet Multiplet Table,” National Bureau of Standards Circ. 488 (1952).