Measurements of absorption line frequency shifts and line broadening effects using frequency stabilized 15 micron lasers

Abstract

This work deals primarily with measurements of molecular line's frequency shifts induced by pressure, laser power and applied frequency modulation. The subjects of the study were infrared transitions in acetylene (C2 H2) and ammonia (NH3) molecules, which are important from the point of view of telecommunications and metrology researchers. In addition, the measurements of saturated line power broadening were carried out for selected lines of 12C2H2 and 13C2H2 as well as for the recently discovered saturated absorption line in 14NH3. This study led to experimentally establishing the molecular dipole moments for a given transition even without proper ro-vibrational assignment.