Wavelength Calibration: Line Lists and Identifications
Line Lists and Plots for each lamp
The following plots and line lists identify the wavelengths in units of Angstroms. Only lines positively identified in MODS comparison lamp spectra are listed. The wavelengths are taken from the NIST Handbook of Basic Atomic Spectroscopic Data and are wavelengths in air (not vacuum), according to the information on the NIST web pages which states that for wavenumbers smaller than 50,000 cm-1, wavelengths are in air.
Below are plots which identify prominent lines in the coadded Hg[Ar], Xe+Kr and Ar spectra for MODS1 Blue and in the coadded Ne, Xe+Kr and Ar spectra for MODS2 Red Grating modes. These are useful also for Dual Grating mode, for which the standard scripts take 3 images using a total of 5 lamps: Ne+Hg[Ar], Xe+Kr and Ar. Below the MODS1 Blue Grating plot are two screenshots which zoom about the regions of the 3650.158 and 4916.507 (4916.608 was a typo) lines of Hg.
The intensities of the individual lamps in MODS1 and MODS2 differ, leading to differences in the appearances of the composite lamp spectra from the two instruments. Therefore, below the MODS1 composite spectra are a set of plots which show the dual grating composite (Ne+Hg[Ar], Xe+Kr and Ar) spectra in pixel space, for both MODS2, first, and then for MODS1, in both blue and red channels.