Optical emission spectroscopy for diagnosis of diamond growth and etching processes in microwave plasmaV.Yu. Yurov, E.V. Bushuev, A.P. Bolshakov, I.A. Antonova, V.G. Ralchenko and V.I. KonovEPJ Web Conf., 149 (2017) 02013DOI: https://doi.org/10.1051/epjconf/201714902013