High-resolution Fourier transform spectroscopy

Previous studies of line widths and shapes of spectral lines emitted from the inductively coupled plasmas (ICP) have concentrated on plasmas sustained in pure argon. For the present study, the authors used the Los Alamos Fourier transform spectrometer to estimate line widths and line shapes of Fe I lines emitted from helium and argon-nitrogen ICP discharges. The effect of gas composition and plasma operating conditions on widths and shapes of the spectral lines are examined. Line widths and line shapes of Fe lines are compared with those of argon and helium for Ar ICP and He ICP discharges. Results are used to calculate Doppler temperatures and electron numbers densities of the cited plasmas