Fluorescence line narrowing spectrometry

The structure of the adduct was established by fluorescence line narrowing spectrometry (FLNS). Recovery and precision data were not reported (Rogan et al. 1990). 

Recently, alternate approaches to PAH-analysis have been proposed, which could possibly eliminate tedious separations in the future. These luminescence - based techniques make use of the Shpol skii effect, matrix isolation or fluorescence line narrowing spectrometry, combined with site selective laser excitationi Also, the refined mass spectrometric identification technique MS/MS was applied successfully to the analysis of PAH in synthetic fuels. 

Ambient temperature luminescence spectrometry has been applied to the characterisation of complex PAH-mixtures with only limited success because of excessive overlap of excitation or emission spectra. However, considerable sharpening of PAH absorption bands is observed, when these molecules are incorporated into appropriate matrices and solidified at low temperatures. Generally, three different techniques to achieve fluorescence line narrowing have been attempted, which only differ by the nature and the preparation of the host matrix. Methods to perform fluorescence line narrowing spectrometry (FLNS) are based on the Shpol skii effect, matrix isolation or the use of organic glasses. 

Scott Cooper R, Jankowiak R, and Small GJ (1991) Bioanalytical applications of fluorescence line narrowing spectrometry. Practical Spectroscopy Series 12 201-236. 

The radiation may be due to emissions from a hot source, or to the luminescence, fluorescence or phosphorescence of the sample. An emission spectrum consists of a number of generally very narrow peaks (called spectral lines) occurring at certain wavelengths which are characteristic of the materials contained within the source. The amplitudes of the peaks are related to the abundance or concentration of the materials present. Alternatively, radiation from a source is passed through a sample. In this case the quantity absorbed by the sample at a particular wavelength is again characteristic of the materials present in the sample. This is termed absorption spectrometry and produces spectral transmission lines in the form of equally narrow valleys—or peaks (Fig. 6.42) where the information is expressed in terms of absorbance (si) rather than transmittance (20<57>, and ... 

X-ray Fluorescence Spectrometry and Inductively Coupled Plasma analysis reveal the presence in the zircons of all existing REE. The steady-state luminescence in natural zircons is dominated by broad emission arising from radiation-induced centers and narrow emission lines of Dy " (Trofimov 1962 Tarashchan 1978). These emissions obscure the spectra of other REE. The thermal treatment enables to solve this problem in certain cases using the fact that the intensity of broad band luminescence quickly decreases after heating at 700 °C-800 °C, while the intensities of the REE lines remain nearly constant (Shinno 1986, 1987). Even after heating the samples not all the REE can be identified by steady-state spectroscopy since the weaker luminescence lines of certain REE are obscured by stronger luminescence of others. For example, luminescence of Pr " is difficult to... 

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