Abstract
Line strengths were measured for four transitions of the HO radical near 2.93 μm in the fundamental vibration-rotation band using a tunable infrared diode laser coupled to a molecular modulation spectrometer. The hydroxyl radical was produced by modulated photolysis of O3 at 2537 Å in the presence of H2O, and its number density obtained from numerical simulation of the complete photochemical system. The strongest line observed was at 3407.607 cm−1 with a measured line strength of 3.3±1.5×10−20 cm2 molecule−1 cm−1.
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