Abstract
A novel technique, employing high-order derivative absorption spectroscopy, is used to demonstrate that the resolution of nearly overlapping lines, with disparate oscillator strengths, can be obtained. The method employs tunable diode lasers and does not require expensive wavelength-resolution apparatus. An experimental demonstration involving nearly overlapping lines of the weak (doubly forbidden by the spin selection rule and the lack of an electric dipole oscillator strength) A band of molecular oxygen is provided. The advantages of the method in being able to inexpensively monitor the densities (and other properties) of more than one specie simultaneously, and in the investigation of line-shape profiles, are briefly discussed also.
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