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Double Modulation Diode Laser Absorption Spectrometry by Simultaneous Wavelength Modulation and Optically Induced Population Modulation—application to Trace Element Detection in Window-equipped Graphite Furnaces by Jörgen Gustafsson; Florian M. Schmidt; Rui Guerra; Ove Axner is a Chemistry article available to read on EtoBox.

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A new diode laser-based double modulation absorption spectrometry (DMAS) technique for detection of species in trace amountsyconcentrations is presented. The new technique makes use of a simultaneous modulation of the wavelength and population in order to reduce the background signals from multiple reflections in optical components (so-called etalon effects) that normally appear in ordinary wavelength modulation absorption spectrometry (WMAS). The simultaneous wavelength and population modulation are achieved by splitting the light from a wavelength-modulated diode laser into two beams-one strong pump beam and one weak probe beam-that subsequently are overlapped in an interaction region inside a sample compartment. The objective of the pump beam is to periodically transfer population from the state with which the probe beam interacts. The modulation of the population is achieved by modulating the pump beam with a chopper. The transmission of the probe beam is detected and demodulated at a frequency that is a combination of various harmonics of the wavelength modulation and chopping frequencies. The purely optical modulation makes the new technique more generally applicable than oth

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Author

Jörgen Gustafsson; Florian M. Schmidt; Rui Guerra; Ove Axner

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0584-8547)

Published

2004

Language

EN

Field

Chemistry (Physical Sciences)