Abstract
The technique of auto-by-cross correlation (ABCC) is explored as an alternative to gated integration for the quantification of transient signals in spectroscopy. ABCC combines the simplicity of autocorrelation with a signal-to-noise ratio (SNR) near that of cross-correlation. ABCC has been applied to the transient photocurrent signals generated by laser-excited photoionization of an organic test molecule in a polar solvent. It is demonstrated that the SNR is within a factor of two of gated integration and cross-correlation. These results are attained with the use of digital and analog signal processing and for flow-injection analysis with analog processing. System noise characteristics are studied to demonstrate the fact that the arrangement used is not, in fact, optimum owing to problems unique to photoconductive detection of the photoionization event. It is also demonstrated that rigorous timing of the detection circuitry is not required for optimum SNR with ABCC, allowing the elimination of relatively complex and expensive signal processing equipment.
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