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Infrared emission of a gas mixture of N2 and SiH4 activated by radio frequency discharge has been analyzed using high resolution Fourier transform information. In addition to the several electronic bands of N2, signatures of three transient species--namely, NH, SiN and SiNH--have already been identified. For iminosilicon SiNH this is the first gas phase spectroscopic observation. Molecular parameters have been derived with a high accuracy. For nitride silicon, radical new A2$PI - X2(Sigma) bands have been observed. These data have been combined with other available information in order to improve molecular structure.© (1992) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

A new method for the selective detection of paramagnetic molecules in high resolution Fourier spectroscopy is described. Essentially, it is founded on the circular polarization property of the Zeeman transitions in a longitudinal magnetic field. It is applied to the selective detection of the NO radical created in a N20 electrical discharge.

Emission spectra of the hydroxyl radical have been recorded between 450 and 4200/cm at 0.0027/cm unapodized resolution from an air+oxygen+water vapor plasma, using a surface microwave discharge. The characteristics of the source are described. The emission spectra were recorded with the F.T. spectrometer using a GeCu detector and KCl beams plitter. High J values were observed both for the pure rotational transition in v=0 and v=1 vibrational levels, and for the rovibrational transition in the 0-1 and 1-2 bands. The set of line intensity data will be used to compute the electric dipole moment function of OH.