Abstract: A highly stable high intensity atomic emission light source has a discharge region and the sample region each controlled by a separate heater. The sample region heater is controlled by a lamp stabilizer circuit which maintains the breakdown voltage within the discharge region at a constant level, thus providing a stable and high intensity light source.

Abstract: A process which extends the measurement range of Zeeman atomic absorption spectroscopy by linearization of the calibration curve in the region of relatively high sample concentration. The intensities of the Zeeman components I.pi.o, I.sigma.o, I.pi. and I.sigma.

Abstract: A device for the individual adjustment of the intensity of several spectral lamps (1, 2), the radiation of which is combined into a common ray path (4), is distinguished by the fact that a device is provided for the modulation of the emission of each of the spectral lamps (1,2) with a different frequency, a beam-splitting mirror (8) for extraction of a part of the total radiation is inserted into the common ray path (4), a photoelectric receiver (9) is provided for the generation of an electrical signal which is proportional to the intensity of the extracted radiation, and frequency filters (11, 23) which are tuned to the modulation frequencies of the spectral lamps (1, 2) are arranged behind the photoelectric receiver (9), regulators, comprising a phase-locked loop (PLL) (12, 22), an automatic gain control (AGC) (13, 23) and a power amplifier (10, 20), for control of the intensity of the respective spectral lamp (1, 2) being allocated to the frequency filters.