NONCONTACT TEMPERATURE-MEASUREMENTS OF DIAMOND BY RAMAN-SCATTERING SPECTROSCOPY

The possibility of determining the temperature of diamond by noncontac t Raman spectroscopy is assessed critically. The intensity ratio of St okes to anti-Stokes lines is shown to be ill suited for temperatures a bove similar to 750 K. Employing the temperature coefficient of the Ra man line position, on the other hand, turns out to be a straightforwar d and highly reliable means to measure diamond temperatures between 30 0 and 2000 K with an accuracy of +/- 10 K. A prerequisite for the appl ication of this method is an empirically developed formula which descr ibes the temperature coefficient of the Raman active phonon frequency with high accuracy. Examples of temperature measurements on single cry stal diamond and diamond films grown by chemical vapor deposition are given. The application of this procedure to the temperature measuremen t of silicon and germanium is demonstrated. (C) 1998 American Institut e of Physics.