title: Selective detection of molecular ions in dc discharges by dual-beam Fourier transform spectroscopy.
abstract: A new method to detect molecular ions selectively in gas discharges by Fourier transform emission spectroscopy is proposed. This method is by dual-beam optical subtraction. The difference spectrum between blue and red Doppler-shifted components is obtained directly thus eliminating the large background that is due to neutral precursors.
authors.forename: P A
authors.initials: PA
authors.lastname: Martin
authors.forename: G
authors.initials: G
authors.lastname: Guelachvili