A 5 μsec Dual Beam Flash Photoelectric Apparatus

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Abstract
A dual beam flash photolysis apparatus for photoelectric recording is described. The use of a millisecond flashlamp as the analysis light source combined with a heavily decoupled 6 stage photomultiplier dynode chain offers the advantage of good uv output, convenient pulsed light source permitting high current photomultiplier operations without additional gating instrumentation, minimum photolysis of the sample, and extremely high intensity, which increases signal with respect to shot noise, scatter, and electrical interference. Dual beam operations reduce the baseline variations due to analysis source fluctuations. For transients longer than 1 msec, dc light sources are used. The photolysis flash energy is 200 J in a light pulse of 5 μsec wide at ⅓ of its peak value.

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