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Titolo:
Application of semiconductor light sources for investigations of photochemical reactions
Autore:
Landgraf, S;
Indirizzi:
Graz Univ Technol, Inst Phys & Theoret Chem, A-8010 Graz, Austria Graz Univ Technol Graz Austria A-8010 Theoret Chem, A-8010 Graz, Austria
Titolo Testata:
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
fascicolo: 10, volume: 57, anno: 2001,
pagine: 2029 - 2048
SICI:
1386-1425(20010901)57:10<2029:AOSLSF>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
LASER-INDUCED FLUORESCENCE; MICELLAR ELECTROKINETIC CHROMATOGRAPHY; PHOTON COUNTING INSTRUMENT; POLYCYCLIC AROMATIC-HYDROCARBONS; COLUMN LIQUID-CHROMATOGRAPHY; TIME-RESOLVED MEASUREMENTS; SINGLE-MOLECULE DETECTION; VIOLET DIODE-LASER; IN-SITU ANALYSIS; EMITTING DIODE;
Keywords:
laser diodes; ultrabright light emitting diodes; time-resolved single photon counting; modulation fluorometry; chemical sensing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
141
Recensione:
Indirizzi per estratti:
Indirizzo: Landgraf, S Graz Univ Technol, Inst Phys & Theoret Chem, Technikerstr 4-I,A-8010 Graz, Austria Graz Univ Technol Technikerstr 4-I Graz Austria A-8010 ustria
Citazione:
S. Landgraf, "Application of semiconductor light sources for investigations of photochemical reactions", SPECT ACT A, 57(10), 2001, pp. 2029-2048

Abstract

Semiconductor light sources, like laser diodes or ultrabright light emitting diodes, are widely used in optical spectroscopy. In this presentation anoverview of applications in photochemistry is given. Since the beginning of the 1990s an increasing number of publications with the application of semiconductor light sources appeared. Three different techniques were used: single photon counting with short pulses, phase-modulation fluorometry usinga conventional modulation spectrometer, or a lock-in amplifier. Using continuous wave laser diodes in the visible region, which are available from 690 to 630 nm (and, recently, down to 400 nm), a new compact fluorescence spectrometer was developed in our laboratory. Using the phase fluorometric method, measurements down to 100 ps are now possible. Values can be measured in steps of 10 ps with good reproducibility using a high-frequency signal generator and a GHz digital storage oscilloscope. Several investigations havebeen carried out applying this technique including time-resolved detectionof crude oil as an example for possible practical applications. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 20:07:27