A secondary laser cavity system for spectrophotometry of trace elements based on intracavit6y quenching and thermal lens effects

Modern analytical thermooptical spectroscopy

“…The metrological characteristics of the method have been comprehensively evaluated, and its possibilities in the determination of traces of organic and inorganic compounds have been examined. 82,86,87,106,298,353,541,546 In addition, this research team published the only Russian monograph 2 (and the first monograph in the world), which was completely devoted not only to the physics of the thermooptical phenomena but also to instrumental possibilities of thermal lens spectrometry and (which is of most importance) to its analytical applications. The results of the studies performed by this research group in the field of thermooptical spectroscopy were so voluminous that they are still being published (even ten years after the completion of their research).…”

“…at a level of 50 ± 100 pg ml 71 . 2,24,86,87,298,353 Procedures were developed for the detection of cobalt, nickel and iron with the use of nitrosonaphthol, 90 dimethylglyoxime 91 and 1,10-phenanthroline. 92 A combination of reliable photometric methods and a universal methodology for devising thermal lens procedures made it possible to achieve the detection limits of 0.2 ± 10 pg ml 71 and the quantifiable concentration ranges from 3 to 5 orders of magnitude.…”

“…Procedures for the determination of trace amounts, which cannot be used within the framework of conventional spectrophotometry (for example, for the determination of metals inolved in aqua complexes), deserve attention. 29,43,77,86,87,353,357 Studies devoted to thermal lens techniques for the detection of individual rare-earth metals and their mixtures 30,31,62,70,80 are of most interest. In this case, virtually no additional sample preparation is required, because absorption bands of aqua complexes of rareearth metals are rather narrow, due to which they can be selectively determined in soils, 30 waters 80,81 and uranium fuel 70 at a level of y610 77 ± y610 76 mol ml 71 .…”