Abstract

We report here the development of a new microsampling device for UV Raman measurements which permits the use of sample volumes as small as 50 μL and which permits recirculation of the sample to minimize sample heating and the contribution of transient species. UV Raman studies with pulsed laser sources (typically ~ 10 ns duration) can cause transient heating during the laser pulse. Unless the sample is exchanged between pulses, the Raman measurements will monitor previously heated sample volumes which may contain thermally or photochemically generated transient species. Given the ~ 10 ms intervals between laser pulses, we may observe photochemically generated transient species with decay times longer than ~ 1 ms. In addition, the long thermal diffusion times which exist for typical samples will result in the significant heating of a static illuminated sample volume.

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