Spectral line lists of a nitrogen gas discharge for wavelength calibration in the range $4500-11000$cm$^{-1}$
A. Boesch, A. Reiners

TL;DR
This paper presents a comprehensive line list of over 40,000 nitrogen gas discharge emission lines in the near-infrared, aiming to improve wavelength calibration for astrophysical spectrographs.
Contribution
It provides the first extensive, high-resolution spectral line list of nitrogen discharge emission lines covering 4500-11000cm$^{-1}$, filling a gap in calibration sources for near-infrared spectroscopy.
Findings
Over 40,000 emission lines identified and cataloged.
Spectra show dense lines with 350-1300 lines per 100cm$^{-1}$.
Line intensities span four orders of magnitude.
Abstract
A discharge of nitrogen gas, as created in a microwave-induced plasma, exhibits a very dense molecular emission line spectrum. Emission spectra of this kind could serve as wavelength calibrators for high-resolution astrophysical spectrographs in the near-infrared, where only very few calibration sources are currently available. The compilation of a spectral line list and the characterization of line intensities and line density belong to the initial steps when investigating the feasibility of potential wavelength calibration sources. Although the molecular nitrogen spectrum was extensively studied in the past, to our knowledge, no line list exists that covers a continuous range of several thousand wavenumbers in the near-infrared. We recorded three high-resolution (cm) spectra of a nitrogen gas discharge operated at different microwave powers. The…
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