With its third data release, European Space Agency's Gaia mission publishes for the first time low resolution spectra a large number of celestial objects. These however differ in their nature from typical spectroscopic data. They do not consist wavelength samples with associated flux values, but are represented by linear combination Hermite functions. We derive an approach to study spectral lin...

The intensity ratio of two atomic or ionic spectral lines in a plasma is a function of electron temperature. By imaging two spectral lines, and computing the line ratio, pixel by pixel, an image of the electron temperature is produced. This is demonstrated using a dusty plasma consisting of submicron particles suspended in an argon RF glow discharge.

The Infrared Spatial Interferometer at University of California, Berkeley has been outÐtted with a Ðlter-bank system to allow interferometric observations of mid-infrared spectral lines with very high spectral resolution (j/*jD 105). This paper describes the design, implementation, and performance of the matched 32 channel Ðlter-bank modules, and new spectral-line observations of Mars and IRC ]...