Leon J. Radziemski, Kenneth L. Andrew, Victor Kaufman, and Ulf Litzén, "Vacuum Ultraviolet Wavelength Standards and Improved Energy Levels in the First Spectrum of Silicon*," J. Opt. Soc. Am. 57, 336-340 (1967)
Vacuum ultraviolet Si i wavelengths have been recalculated using all available low-pressure-source data. One hundred calculated and forty-one measured wavelengths, all with uncertainties less than 0.002 Å, should be useful as wavelength standards in the region 1560 to 2000 Å. Seventy-seven of the proposed standards were originally calculated by Radziemski and Andrew [
J. Opt. Soc. Am. 55,
474 (
1965)]; although the two sets of wavelength values agree to within their uncertainties, the new set has a greater internal consistency. Included also is a complete list of low-pressure-source levels for Si i, which contains new values for 30 odd levels previously determined exclusively from relatively high-pressure (450–740 torr) arc data.
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See Ref. 2.
A parenthesis about a level value indicates that the level has been established by a single combination.
This is a high-pressure-source level, included for the sake of completeness.
In Table III, Ref. 2 a misprint placed this level value at 62718.00 cm−1 instead of 62719.00 cm−1.
See Refs. 2, 4.
A parenthesis about a level value indicates that the level has been established by a single combination.
In Table IV, Ref. 2, the value for this level is 54257.491 cm−1. In that work it was supported principally by one interferometrically measured vuv line. A change of the phase-correction curve in that region, along with new data, has led to the improved value given above.
Stark-shift calculations indicate that this level is very sensitive to electric-field perturbation. Stark-shifts were calculated only for 3p3d, 3p4d, and 3s3p3 configurations.
In Table IV Ref. 2, because of a misprint, level 56° was listed as 61 841.00 when it should have read 61 842.00 cm−1.
Ref. 4.
Calculations indicate that this line will be sensitive to Stark-effect perturbations. See footnote d, Table II.
The value of this line in Table VI Ref. 2 is 1850.6750 Å. In that work the level from which it was calculated was supported by one uv interferometric line. An improvement of the phase-change curve in that region, along with new data, has led to the improved calculated value given above.
This line is within 0.04 Å of a strong Ge i line.
See Ref. 2.
A parenthesis about a level value indicates that the level has been established by a single combination.
This is a high-pressure-source level, included for the sake of completeness.
In Table III, Ref. 2 a misprint placed this level value at 62718.00 cm−1 instead of 62719.00 cm−1.
See Refs. 2, 4.
A parenthesis about a level value indicates that the level has been established by a single combination.
In Table IV, Ref. 2, the value for this level is 54257.491 cm−1. In that work it was supported principally by one interferometrically measured vuv line. A change of the phase-correction curve in that region, along with new data, has led to the improved value given above.
Stark-shift calculations indicate that this level is very sensitive to electric-field perturbation. Stark-shifts were calculated only for 3p3d, 3p4d, and 3s3p3 configurations.
In Table IV Ref. 2, because of a misprint, level 56° was listed as 61 841.00 when it should have read 61 842.00 cm−1.
Ref. 4.
Calculations indicate that this line will be sensitive to Stark-effect perturbations. See footnote d, Table II.
The value of this line in Table VI Ref. 2 is 1850.6750 Å. In that work the level from which it was calculated was supported by one uv interferometric line. An improvement of the phase-change curve in that region, along with new data, has led to the improved calculated value given above.
This line is within 0.04 Å of a strong Ge i line.