Tunable diode-laser spectra of the very weak ν10 absorption band of C2H3D

The C2H3D spectra from 730 to 780 cm−1 have been investigated with a tunable diode laser spectrometer at Doppler-limited resolution and a wavenumber accuracy of better than 10−3 cm−1. This resolution, combined with a long absorption path, has allowed the identification of Ka series lines belonging to the ν10 level. A five-level combined analysis was performed, including previous data available for the energy states involved in the region around 1000 cm−1.