INFRARED DIODE-LASER SPECTROSCOPY OF HIGH-TEMPERATURE MOLECULES USINGSPECTRUM PROCESSING BY FOURIER TRANSFORMATION

A heat-pipe high-temperature cell of the White cell type was construct ed for sensitive detection of the spectra of high-temperature molecule s. It has been incorporated into the optical system of a tunable diode laser spectrometer. With a 40 m optical path length abundant spectral lines of the DELTAupsilon=2 vibration-rotation bands of NaBr have bee n observed in the wavenumber range between 560 and 600 cm-1. The techn ique of spectrum processing by use of Fourier transformation was appli ed to the source-modulated diode laser spectrum to eliminate fringes a nd to improve the signal-to-noise ratio.