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We report the detection and spectroscopy of the fundamental vibrational band of the OH radical at 3 μm. The mid-IR radiation was produced by difference frequency generation mixing a Nd-YAG laser and a diode laser (λ=0.785μm). OH detection was demonstrated at high sensitivity by observing a minimum detectable pressure of 0.225 μbar for an optical length of 50 cm. Finally, we identified four OH lines,...
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