Optics and Photonics Society of Iran

Abstract- High resolution laser spectroscopy of cooled radicals, ions and the molecules of astronomical interests at low temperatures have been of considerable interest to both astronomers and laboratory spectroscopists. Supersonic plasma jets offer an elegant method to generate such a molecular species. (1) circular (or pinhole) plasma jet and (2) planar (or slit) plasma jet are two type of supersonic plasma jets, which have been applied recently in many experimental attempts. This article presents technical aspects of these devices and describes how they have been used to record high resolution absorption spectra of radicals. Finally, the experimental advantages and disadvantages for present plasma systems have been discussed.