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J/MNRAS/390/733     FTS reference UV wavelengths of CrIII    (Smillie+, 2008)

Reference ultraviolet wavelengths of Cr III measured by Fourier transform spectrometry. Smillie D.G., Pickering J.C., Smith P.L. <Mon. Not. R. Astron. Soc., 390, 733-740 (2008)> =2008MNRAS.390..733S
ADC_Keywords: Atomic physics Keywords: atomic data - line: identification - methods: laboratory Abstract: We report CrIII ultraviolet (UV) transition wavelengths measured using a high-resolution Fourier transform spectrometer (FTS), for the first time, available for use as wavelength standards. The doubly ionized iron group element spectra dominate the observed opacity of hot B stars in the UV, and improved, accurate, wavelengths are required for the analysis of astronomical spectra. The spectrum was excited using a chromium-neon Penning discharge lamp and measured with the Imperial College vacuum ultraviolet FTS. 140 classified 3d34s-3d34p CrIII transition lines, in the spectral range 38000 to 49000cm-1 (2632 to 2041Å), the strongest having wavelength uncertainties less than one part in 107, are presented. Description: The Cr III spectrum was acquired in the wavenumber range 31596 to 63192cm-1, using the Imperial College (IC) VUV FTS, and a PDL as light source. The spectral resolution used, 0.12cm-1, was sufficient to fully resolve the Doppler broadened transition line profiles, for which the average unblended full-width at half maximum (FWHM) was just under 0.3cm-1. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 88 140 The classified Cr III transition linelist observed by FTS
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 F4.2 [-] logInt Logarithm (to the base ten) of the integrated intensity (in arbitrary units) 6- 10 F5.3 cm-1 FWHM Line full-width at half maximum 12- 14 I3 --- SNR Signal-to-noise ratio 16- 24 F9.4 0.1nm lam.air Air wavelength 26- 34 F9.4 0.1nm lam.vac Vacuum wavelength 36- 44 F9.3 cm-1 sigma Line wavenumber 46- 51 F6.3 cm-1 Dsigma Wavenumber difference (sigmaobs-sigmaRitz) (1) 53- 57 F5.3 cm-1 e_sigma rms uncertainty on sigma 60- 84 A25 --- Trans Transition (Lower - Upper) 86- 88 A3 --- Note Note (2)
Note (1): Wavenumber difference between the FTS observed wavCobs) and the Ritz wavenumber from Ekberg (1997, Phys. Scr., 56, 141) Note (2): Note provides additional information about the line, as follows: II = blended or doubly identified with a Cr II line III = blended or doubly identified with a Cr III line G = centre-of-gravity (COG) line fit (otherwise least-squares fit to Voigt profile)
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Mar-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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