We thank C. Kiener and C. Klanner for their support in carrying out some of the experiments.I / V t / s Figure 1. Setup of the photoacoustic free-field measurement. The diagram shows a real signal of voltage versus time, with t ¼ 0 being the moment of the laser pulse. 2 % ethene flowed through all channels. The minima correspond to the subsequent reagent outlets, additional minima result from residual echos.
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