Ultraviolet light-induced water-droplet formation from wet ambient air

Proceedings of the Japan Academy. Series B, Physical and Biological Sciences
Keitaro YoshiharaYoshizumi Kajii

Abstract

We report the formation of water droplets by irradiating wet ambient air with deep UV light. The light sources were either a continuous low-pressure mercury lamp or pulsed ArF laser, which both emit light shorter than 200 nm. Water droplets were produced in reaction vessels under different temperature, relative humidity, and moisture-supply conditions. The particles grew as large as about 0.2 mm. The suggested mechanism is discussed with the photo-dissociations of oxygen and successively formed ozone, and further dark reactions giving hydrogen peroxide as a seeding nucleus. Observed concentrations of intermediates were well explained by simulating the proposed chemical reactions. A possible application to artificial rain is briefly described.

Methods Mentioned

BETA
irradiating
light scattering

Software Mentioned

CHEMKIN

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