Authors: Martin, Travis L.; Campiglia, Andres D.

Source: Applied Spectroscopy, Volume 55, Issue 9, Pages 295A-308A and 1115-1282 (September 2001) , pp. 1266-1272(7)

Publisher: Society for Applied Spectroscopy

Abstract:

A fiber-optic system is reported for rapid, accurate, and precise 77 K measurements of relatively long phosphorescence lifetimes (τp = 200 ms). The instrument employs stimulated Raman scattering in connection with a pulsed laser source for sample excitation. Phosphorescence decay waveforms are collected at maximum emission wavelengths with a single channel detection system and the aid of a LabVIEW based in-house program acting as a data acquisition instrument, data storage device, and data interpreter. By means of program looping, up to 20 decays are recorded from a frozen sample in less than 5 min. A cryogenic fiber-optic probe directly frozen into the sample matrix removes the random errors associated with the classic sample freezing procedure and provides excellent reproducibility of measurements. The relative standard deviations of τp measured from several polycyclic aromatic compounds varied between 0 and 4.30%. The simplicity of the experimental procedure, the rather large τp differences observed from compounds within the same pollutant class, and the analytical figures of merit provide a solid foundation for pursuing low-temperature phosphorescence, time-resolved low-temperature phosphorescence, and low-temperature multidimensional luminescence analysis.

Keywords: POLYCYCLIC AROMATIC COMPOUNDS; SHPOL'SKII SPECTROMETRY; LOW-TEMPERATURE LASER-INDUCED PHOSPHORESCENCE; INSTRUMENTATION; STIMULATED RAMAN SCATTERING

Document Type: Research article

DOI: http://dx.doi.org/10.1366/0003702011953306

Publication date: 2001-09-01

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