Abstract
The development of a simple and inexpensive ($10-$20) approach to obtaining the second harmonic response is described using electronic multiplication of the ac reference signal to the phase-selective detector. The principle can be understood by consideration of trigonometric identities of the type [formula omitted] The performance of the circuitry is assessed on a commercially available instrument and the theoretical response obtained in both aqueous and nonaqueous solvents. Phaseselective detection is employed and the use of this readout form in analytical work is discussed.
Original language | English |
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Pages (from-to) | 1754-1758 |
Number of pages | 5 |
Journal | Analytical Chemistry |
Volume | 46 |
Issue number | 12 |
DOIs | |
Publication status | Published - 1 Oct 1974 |
Externally published | Yes |