in Molecular Hydrogen

Abstract. Using a specially designed excimer-laser-pumped dye laser of adjustable bandwidth igh-lying pure rotational transitions of both, ortho- and para-hydrogen have been identified by coherent anti-Stokes Raman scattering (CARS). As an interesting application Hz-based CARS-thermometry is discussed. PACS: 42.65 Coherent anti-Stokes Raman spectroscopy (CARS) using rotational-vibrational transitions has proven to be a powerful tool in various areas of science and technology since its first demonstration by Maker and Terhune [1]. Use of pure rotational transitions, how-ever, has been made so far only in a few applications dealing with concentration and temperature measure-ments of small molecules, such as Hz, N2, 02, N20, and CO [2-12]. It is the purpose of this paper to demonstrate hat pure rotational CARS spectroscop