Abstract

The variation of sulfur isotope ratios in ultramarine blue may have some use in the identification of type and source of this important artists' pigment. The distinction between synthetic and natural material, and the distinction of different sources of the latter, can be helpful in identifying forged paintings. The conversion of a 20-year-old mass spectrometer into a precision isotope ratio instrument and its use for the analysis of relatively small samples is described.

Isotope ¹⁸O/¹⁶O ratio measurements of water vapor by use of photoacoustic spectroscopy

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First field determination of the ¹³C/¹²C isotope ratio in volcanic CO₂ by diode-laser spectrometry

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Real-time standoff detection of nitrogen isotopes in ammonia plumes using a swept external cavity quantum cascade laser

Mark C. Phillips, Brian E. Brumfield, and Sivanandan S. Harilal
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Oxygen isotope ratio measurements in CO₂ by means of a continuous-wave quantum cascade laser at 4.3 μm

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Sulfur as a Standard of Reflectance in the Infrared

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J. Opt. Soc. Am. 53(4) 458-465 (1963)