Calibrating Raman Spectrometers with Plasma Lines from the Argon Ion Laser

The majority of the plasma lines of the argon ion laser are shown to be transitions of the argon ion. These lines are useful for calibrating Raman spectrometers. A table is given of the plasma lines, including relative intensities, wavelengths (in standard air), wavenumber ( in vacuo), and wavenumber shifts relative to the 488.0 and 514.5 nm laser lines. Spectra showing the relative intensities of these lines are also shown.