Abstract
Sub-doppler optical-optical double resonance (OODR) spectroscopy using two tuneable, 1 MHz width, dye lasers is shown to enehance detection, assignment, and frequency measurement of extra lines in perturbed band spectra. Perturbations of the BaO C 1Σ + (υ = 3, J = 50) level are recognized by the appearance of narrow (Δν ≈ 60 MHz) extra lines.
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