New atomic emission lines observed in ICP and dc arc near-infrared spectrum of sulfur

In present work, nine previously unknown S I emission lines were observed and described in ICP, helium and argon dc arc plasma. The observations were performed in 910–970 nm spectral range via high-sensitive Ebert fiber-optic spectrometer with linear CMOS array detector with resolution 0.06 nm. Measurements of wavelengths were performed with 0.003 nm accuracy. The wavelengths and relative intensities of all observed sulfur lines in this spectral region, including new ones, were presented in table. Sulfur spectra in dc arc plasma were found to exhibit significant wavelength shifts when compared to ICP ones. These shifts were measured and presented in table as well.