Detection of structured interferences in a.c. Zeeman atomic absorption by harmonic analysis

Harmonic analysis of the signals produced by Zeeman correction with an alternating magnetic field shows that the amplitudes of the harmonic frequencies vary with the position and half-width of the interfering line. Amplitude ratios can serve as a parameter to detect the occurrence of such interferences over a limited concentration range. Calculations are based on a model using normal Zeeman splitting. Measurements are made for the iron-platinum interference at 217.9 nm and for the interference between the isotopes of lithium at 670.8 nm.