Abstract
The optothermal window (OW) cell is a compact photothermal device similar to an open photoacoustic cell. Using the c.w. He-Ne laser for excitation, and a piezoelectric transducer, the concentrations of ammonium ion (range 2 to 400 mmol/m3) in water were determined via the measurement of the amplitude of the OW signal. Although theoretical signal phase saturates in case of weak absorption, it was demonstrated here that at specific modulation frequencies the uncorrected signal phase carries spectrophotometric information as well. This is due to the fact that the phase of the background signal is shifted relative to that of the absorption signal. Simpler calibration procedure is an advantage in phase measurements.
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