Laser-induced resonant excitation of ethylene molecules in [C.sub.2][H.sub.4]/[C.sub.2][H.sub.2]/[O.sub.2] reactions to enhance diamond deposition

The C[O.sub.2] laser resonant excitation of [C.sub.2][H.sub.4] molecules in [C.sub.2][H.sub.4]/[C.sub.2][H.sub.2]/[O.sub.2] combustion chemical-vapor deposition (CVD) of diamond films is examined in open air in order to develop a new approach to promote diamond growth with laser resonant excitation of vibrational states of precursor molecules. The temperature calculations from the line set in the R-branch of CH emission spectra have shown that a nonthermal process is involved in the enhanced diamond deposition.