HIGH-SENSITIVITY INTRACAVITY ABSORPTION-SPECTROSCOPY OF CHD3 IN THE NEAR-INFRARED WITH A TITANIUM - SAPPHIRE LASER

By using a Ti: sapphire crystal as an amplifying medium the intracavity laser absorption spectroscopy technique (ICLAS) has been extended to the near-infrared range (10000-12000 cm-1). This range of energy is particularly interesting for the overtone spectroscopy of X-H stretching vibrations (X = C, N, O, Si, Ge). As an illustration of the possible spectroscopic applications of this spectrometer we present here the absorption spectrum of CHD3 in the range of the DELTAnu(CH) = 4 overtone transitions. Due to the Fermi interaction between the nu1 stretching mode and the nu5 bending mode, two bands have been observed at 11266.95 and 11062.6 cm-1. Their rotational analysis is reported and discussed.