ABSOLUTE INTENSITIES OF SPECTRAL-LINES IN THE Q-BRANCH OF THE CH3D ATLOW-TEMPERATURE

This study reports the experimental measurement of absolute intensitie s for individual lines of the Q branch in the nu2 band of CH3D near 20 00 cm-1 at low temperature. High resolution infrared spectroscopy is a powerful tool for understanding the composition and dynamical structu res of planetary atmospheres. In fact, CH3D has been detected in the a tmospheres of Jupiter, Saturn and Titan, so accurate intensities for i ndividual ro-vibrational lines are needed for determining CH3D abundan ce and the D/H ratio in planetary atmospheres.