CRDS Detection of HS Radical in HFCVD Diamond Thin Film

In the present study, the HS radical was detected using the Cavity Ring Down Spectroscopic (CRDS) method in hot filament diamond CVD for the CH$_{4}$(0.4{\%})/H$_{2}$ mixture doped by H$_{2}$S (400 ppm). The HS radical was detected both by the 0 - 0(A ---X) and 1 - 0(A --- X) transitions. The absolute absorption density spectrum of the HS radical was obtained as well as the absolute HS concentration estimation. This study proofs that the HS radical is an intermediate produced during the diamond CVD synthesis.