Measurement of Hydroxyl Concentrations in Air Using a Tunable uv Laser Beam

Abstract
We report the first measurement of hydroxyl (OH) concentrations in air by detecting the resonance fluorescence excited by tunable radiation near 2825.8 Å. On a particular day, the OH concentrations deduced from these measurements ranged from a high of 1.5 × 108 OH/cm3 in the early afternoon to a level below 5 × 106 OH/cm3 at night.

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