Time resolved molecular spectroscopy using high power solid state lasers in pulse transmission mode. A re-examination of the Sn← S1 spectra of naphthalene and anthracene

Bebelaar, D.

doi:10.1016/0301-0104(74)80061-3

Cited by 81 publications

(34 citation statements)

References 32 publications

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“…The spectrum has maxima centered at 420, 400, and 380 nm. After delay, the wavelength resolution of the spectrum even increased; the recorded absorption band maxima coincided with the maxima of the T-T absorption bands obtained by other authors (for example, see [10]). …”

Section: Results and Their Discussionsupporting

confidence: 52%

Transient Absorption of Organic Molecules under High-Power Laser Excitation

Svetlichnyi¹,

Kopylova²,

Mayer³

et al. 2005

Russ Phys J

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In the present work, results of investigations into the transient absorption of some organic compounds by the method of pulsed flash photolysis are given. Experimental investigations were carried out using an original setup of pulsed flash photolysis with an exciting pulse of XeCl-laser radiation of nanosecond duration and sensing by broadband laser-transient fluorescent radiation of a mixture of organic fluorophors called "white light" excited by the same source in the wavelength range 330-750 nm. The setup registers the short-living (singlet-singlet) and long-living (triplet-triplet) absorptions. The transient absorption spectra of already investigated para-terphenyl, naphthalene, and 1-phenyl-2(2-naphthyl)-ethylene molecules are presented; the spectra of the transient absorption and its nature are in good agreement with the experimental and calculated data published in the literature. We first investigated the transient absorption of LOC1 (S 1 -S n at 580 nm and T 1 -T n at 500 nm) and phenalemine 512 (S 1 -S n at 395 nm). It is demonstrated that the experimentally observed induced absorption of phenalemine 512 and PD 789 is the S 1 -S n absorption, which is in good agreement with the results of quantum-chemical calculations.

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Section: Results and Their Discussionsupporting

confidence: 52%

Transient Absorption of Organic Molecules under High-Power Laser Excitation

Svetlichnyi¹,

Kopylova²,

Mayer³

et al. 2005

Russ Phys J

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“…A CAT (Varian C-1024) was used to improve the signal-to-noise ratio in the phosphorescence lifetime measurements. A complete description of the instrumental operations for the laser photolysis experiments has been given elsewhere (Lavalette et al, 1971;Bebelaar, 1974). Either frequency-doubled ruby (28,800 cm-') or frequency-tripled Nd3'/glass (28,300 cm-') laser pulses of 3 ns duration were used for excitation of the flavin.…”

Section: Methodsmentioning

confidence: 99%

Laser Photolysis of 3‐methyllumiflavin

Visser

Ommen

Ark

et al. 1974

Photochem & Photobiology

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Abstract—The pH dependence of the transient absorptions of 3‐methyllumiflavin has been investigated with laser photolysis in the nanosecond time range. Three different transient species (I, II and III) can be observed. The analysis of the decay curves shows that I and II can be ascribed to the optical absorption spectra of the lowest excited singlet and triplet states, respectively. Their appearance is not affected by a change of pH of the solution. The transient spectra due to species III have a decay which is dependent on pH. By comparison of these results with spectral data obtained with flavin dissolved in polymethylmethacrylate and with photochemical data reported in the literature, a structure for III is proposed which might explain the observed pH dependence.

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“…In that case, the shorter wavelength absorption persisted over the lifetime of the experiment, while the longer wavelength transient decayed with a time constant comparable to the observed fluorescence lifetime for DEA (above). By analogy to similar peaks in transient absorption spectra of photoexcited anthracene, we assign them to the DEA triplet (18) and singlet (19) excited states, respectively.…”

Section: Transient Absorption Spectroscopymentioning

confidence: 98%

Photooxidation of 9,10-diethoxyanthracene: mechanistic dichotomies between homogeneous solution and reverse micelle photoprocesses

DeVoe¹,

Sahyun²,

Schmidt³

et al. 1990

Can. J. Chem.

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. Can. J. Chem. 68,612 (1990). We have compared the photooxidation of the title compound, DEA, by diphenyliodonium salts in homogeneous acetonitile (AN) and in heptane/AOT/water reverse micelle solutions. The reaction is efficient, which we attribute to rapid (ca. 10 ps) deethylation of the DEA radical cation, initially formed by photoinduced electron transfer. In AN, the electron transfer occurs from singlet excited DEA, but in reverse micelles it is gated by intersystem crossing to triplet DEA. Under these conditions, DEA fluorescence quenching by the iodonium cation may still be observed; we infer operation of the external heavy atom effect as the primary mechanism.Key words: anthracene, electron transfer, reverse rnicelle, photochemistry, picosecond.

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Time resolved molecular spectroscopy using high power solid state lasers in pulse transmission mode. A re-examination of the Sn← S1 spectra of naphthalene and anthracene

Cited by 81 publications

References 32 publications

Transient Absorption of Organic Molecules under High-Power Laser Excitation

Transient Absorption of Organic Molecules under High-Power Laser Excitation

Laser Photolysis of 3‐methyllumiflavin

Photooxidation of 9,10-diethoxyanthracene: mechanistic dichotomies between homogeneous solution and reverse micelle photoprocesses

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