Abstract
AbstractHNO3 was photolysed using an ArF (193 nm) excimer laser. Besides strong emission from OH(A2Σ+), weaker fluorescence from excited NO was observed in the investigated wavelength range 130‐−900 nm. The OH(A) emission is generated by absorption of two laser photons while the NO emission is produced by a one‐photon process. The rotational and vibrational populations of the OH fragments can be explained by a simplified impulsive model with additional contributions from the change of the OH bond length and by a slight bending motion of the parent molecule. Monitoring the strong OH emission appears to be a sensitive method to detect gaseous nitric acid in air in the ppb range.
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