Peer Reviewed: Semiconductor Diode Lasers in Atomic Spectrometry

Niemax, K.; Zybin, A.; Schnürer-Patschan, Christoph; Groll, H.

doi:10.1021/ac961942i

Cited by 51 publications

(30 citation statements)

References 15 publications

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“…17 The line width of a single mode laser applicable for absorption measurements is typically orders of magnitude smaller than the FWHM of the absorption line. 2 Furthermore, the detector diode does not have an apparatus profile like a spectrometer.…”

Section: Correction Of the Saturation Due To Background Emission mentioning

confidence: 99%

Correction factors for saturation effects in white light and laser absorption spectroscopy for application to low pressure plasmas

2012

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In white light absorption spectroscopy, the broadening of the absorption signal due to the apparatus profile of the spectrometer may lead to an underestimation of the determined density as one measures an apparent optical depth. This is in particular true for high optical depth where saturation effects of the transmitted intensity occur. Provided that the line profile of the absorption line is known, the apparent optical depth effect can be accounted for by introducing a correction factor. The impact of the saturation and the approach of considering the effect are demonstrated for argon and indium lines in low pressure plasmas where correction factors of one order of magnitude or even higher are reached very easily. For the indium line, the hyperfine splitting has been taken into account. In laser absorption, the line profile is resolved. However, the weak but rather broad background emission of the laser diode can cause a saturation signal at the photo diode resulting also in an underestimation of the density obtained from the analysis. It is shown that this can be taken into account by fitting the theoretical line profile to the measured absorption signal which yields also a correction factor. The method is introduced and demonstrated at the example of the cesium resonance line including the hyperfine splitting. Typical correction factors around two are obtained for the cesium ground state density at conditions of a low pressure negative hydrogen ion source in which cesium is evaporated to enhance the negative ion production.

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Section: Correction Of the Saturation Due To Background Emission mentioning

confidence: 99%

Correction factors for saturation effects in white light and laser absorption spectroscopy for application to low pressure plasmas

2012

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“…Therefore, even with frequency doubling, these devices cannot be used in the region shorter than 315 nm. Nevertheless, the authors of [27] supposed that SDLs could be used for the development of simple and inexpensive (without the use of monochromators) analyzers for determining some metals (e.g., Al and Cr) and some nonmetals (in particular, S, Cl, and inert gases) that possess highly populated excited energy levels.…”

Section: A New Century and A New Revolution?mentioning

confidence: 99%

Fifty years of atomic absorption spectrometry

Львов¹

2005

J Anal Chem

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The history of atomic absorption spectrometry (AAS) for the 50 years since the publication of the fundamental paper by Alan Walsh "The application of atomic absorption spectra to chemical analysis" is presented. The main steps in the development of flame and electrothermal AAS, from the original idea to its introduction as a well-known method of instrumental analysis, are followed. The current status of AAS and the possible directions of its further development are considered. Fig. 1. Alan Walsh's paper marked the birth of atomic absorption spectrometry.

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“…However, they have not found widespread acceptance for this application so far due to their cost and complex operation compared to hollow cathode or electrodeless discharge lamps. This situation seems to have changed with the advent of inexpensive, mass produced diode lasers (DL) [12,13].…”

Section: Continuum Sourcesmentioning

confidence: 99%