G. Nave, R. C. M. Learner, A. P. Thorne, and C. J. Harris, "Precision Fe i and Fe ii wavelengths in the ultraviolet spectrum of the iron–neon hollow-cathode lamp," J. Opt. Soc. Am. B 8, 2028-2041 (1991)
The wave numbers of 167 Fe i lines between 26 000 and 34 100 cm−1 (385–293 nm), 146 Fe i lines between 33 700 and 51 400 cm−1 (297–195 nm), and 221 Fe ii lines between 35 900 and 54 600 cm−1 (279–183 nm) are measured with a relative precision of 30 parts in 109 by Fourier-transform spectrometry. Bridging techniques are used to place the measurements on the same Ar ii–based absolute wave-number scale as previously measured visible spectra. The uncertainty in the absolute wavelengths is limited by small source shifts and the accuracy of the available standards and is estimated to be 0.002 cm−1 (0.008 pm at 200 nm). This is an order of magnitude better than that of the majority of current UV standards.
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Principal Wavelength Standards Usable in the Region 175-300 nm
Spectrum
Range (Å)
No. of Lines
Precision
mÅ
mK
Ne ii
1751–1954
36
1
25
2756–2967
14
2
25
Al ii
1750–1990
37
2
50
Si ii
1759–2987
79
1.5
40
Ar ii
1868–2980
108
0.1–0.4
10
Mn ii
1760–1934
34
2
50
Co ii
1753–2986
132
0.7–0.4
10
Ge i
1750–2829
94
0.4–1
25
Other
1750–3000
51
Total
585
Present study
1750–3850
539
0.08
2
Table 2
Operating Parameters and Calibration Constants
Spectrum
Gas
Pressure (Torr)
Current (mA)
Voltage (V)
Range (cm−1)
Resolution (mK)
k19
Ar
3
400
272
17 000–35 000
43.2
k11
Ne
4
750
208
17 000–34 000
43.2
i20
Ne
2.5
950
206
41 500–48 000
170
i22
Ne
2.5
950
206
41 500–48 000
170
i24
Ne
2.5
950
206
38 000–44 000
170
i6
Ne
4
750
33 000–44 500
70
i74
Ne
3
350
35 000–46 000
105
i56
Ne
3
320
25 000–43 000
60
Table 3
Recommended Fe i Wavelengths between 25 000 and 33 000 cm−1 for Unblended, Stable Lines Free of Self-Reversal and with an Observed Signal-to-Noise Ratio Greater than 250
The standard deviation of the measurements in mK units, where 1 mK = 0.001 cm−1. This is not an estimate of the absolute accuracy of the measurement.
intensity in arbitary units, based on an analytic integral of the profile, after calibration with a deuterium lamp.
Damping parameter: the ratio of the Lorentzian width to the FWHM of the line. The absence of an entry implies a damping parameter of zero (i.e., a pure Gaussian line).
Number of observations of line.
The ratio of the peak intensity to the average noise in the spectrum. This was constant in the IC spectra but varied in the spectra taken at the NSO.
Table 4
Recommended Fe i Wavelengths between 33 000 and 52 000 cm−1 for Unblended, Stable Lines Free of Self-Reversal and with an Observed Signal-to-Noise Ratio Greater than 250 (σ < 45 000 cm−1) or 100 (σ > 45000 cm−1)
The standard deviation of the measurements in mK units, where 1 mK = 0.001 cm−1. This is not an estimate of the absolute accuracy of the measurement.
Intensity in arbitary units, based on an analytic integral of the profile, after calibration with a deuterium lamp.
Damping parameter: the ratio of the Lorentzian width to the FWHM of the line. The absence of an entry implies a damping parameter of zero (i.e., a pure Gaussian line).
Number of observations of line.
The ratio of the peak intensity to the average noise in the spectrum. This was constant in the IC spectra but varied in the spectra taken at the NSO.
Table 5
Recommended Fe n Wavelengths between 36000 and 55000 cm−1 for Unblended, Stable Lines Free of Self-Reversal and with Observed Signal-to-Noise Ratio Greater than 250 (σ < 45000 cm−1) or 100 (σ > 45000 cm−1)
The standard deviation of the measurements in mK units, where 1 mK = 0.001 cm−1. This is not an estimate of the absolute accuracy of the measurement.
intensity in arbitary units, based on an analytic integral of the profile, after calibration with a deuterium lamp.
Damping parameter: the ratio of the Lorentzian width to the FWHM of the line. The absence of an entry implies a damping parameter of zero (i.e., a pure Gaussian line).
Number of observations of line.
The ratio of the peak intensity to the average noise in the spectrum. This was constant in the IC spectra but varied in the spectra taken at the NSO.
Tables (5)
Table 1
Principal Wavelength Standards Usable in the Region 175-300 nm
Spectrum
Range (Å)
No. of Lines
Precision
mÅ
mK
Ne ii
1751–1954
36
1
25
2756–2967
14
2
25
Al ii
1750–1990
37
2
50
Si ii
1759–2987
79
1.5
40
Ar ii
1868–2980
108
0.1–0.4
10
Mn ii
1760–1934
34
2
50
Co ii
1753–2986
132
0.7–0.4
10
Ge i
1750–2829
94
0.4–1
25
Other
1750–3000
51
Total
585
Present study
1750–3850
539
0.08
2
Table 2
Operating Parameters and Calibration Constants
Spectrum
Gas
Pressure (Torr)
Current (mA)
Voltage (V)
Range (cm−1)
Resolution (mK)
k19
Ar
3
400
272
17 000–35 000
43.2
k11
Ne
4
750
208
17 000–34 000
43.2
i20
Ne
2.5
950
206
41 500–48 000
170
i22
Ne
2.5
950
206
41 500–48 000
170
i24
Ne
2.5
950
206
38 000–44 000
170
i6
Ne
4
750
33 000–44 500
70
i74
Ne
3
350
35 000–46 000
105
i56
Ne
3
320
25 000–43 000
60
Table 3
Recommended Fe i Wavelengths between 25 000 and 33 000 cm−1 for Unblended, Stable Lines Free of Self-Reversal and with an Observed Signal-to-Noise Ratio Greater than 250
The standard deviation of the measurements in mK units, where 1 mK = 0.001 cm−1. This is not an estimate of the absolute accuracy of the measurement.
intensity in arbitary units, based on an analytic integral of the profile, after calibration with a deuterium lamp.
Damping parameter: the ratio of the Lorentzian width to the FWHM of the line. The absence of an entry implies a damping parameter of zero (i.e., a pure Gaussian line).
Number of observations of line.
The ratio of the peak intensity to the average noise in the spectrum. This was constant in the IC spectra but varied in the spectra taken at the NSO.
Table 4
Recommended Fe i Wavelengths between 33 000 and 52 000 cm−1 for Unblended, Stable Lines Free of Self-Reversal and with an Observed Signal-to-Noise Ratio Greater than 250 (σ < 45 000 cm−1) or 100 (σ > 45000 cm−1)
The standard deviation of the measurements in mK units, where 1 mK = 0.001 cm−1. This is not an estimate of the absolute accuracy of the measurement.
Intensity in arbitary units, based on an analytic integral of the profile, after calibration with a deuterium lamp.
Damping parameter: the ratio of the Lorentzian width to the FWHM of the line. The absence of an entry implies a damping parameter of zero (i.e., a pure Gaussian line).
Number of observations of line.
The ratio of the peak intensity to the average noise in the spectrum. This was constant in the IC spectra but varied in the spectra taken at the NSO.
Table 5
Recommended Fe n Wavelengths between 36000 and 55000 cm−1 for Unblended, Stable Lines Free of Self-Reversal and with Observed Signal-to-Noise Ratio Greater than 250 (σ < 45000 cm−1) or 100 (σ > 45000 cm−1)
The standard deviation of the measurements in mK units, where 1 mK = 0.001 cm−1. This is not an estimate of the absolute accuracy of the measurement.
intensity in arbitary units, based on an analytic integral of the profile, after calibration with a deuterium lamp.
Damping parameter: the ratio of the Lorentzian width to the FWHM of the line. The absence of an entry implies a damping parameter of zero (i.e., a pure Gaussian line).
Number of observations of line.
The ratio of the peak intensity to the average noise in the spectrum. This was constant in the IC spectra but varied in the spectra taken at the NSO.