Photophysical properties of laser dyes: picosecond laser flash photolysis studies of Rhodamine 6G, Rhodamine B and Rhodamine 101

1993 ◽  
Vol 89 (23) ◽  
pp. 4185 ◽  
Author(s):  
Paul C. Beaumont ◽  
David G. Johnson ◽  
Barry J. Parsons
Keyword(s):  
Rhodamine B ◽  
Rhodamine 6G ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Photophysical Properties ◽  
Picosecond Laser ◽  
Laser Flash ◽  
Laser Dyes ◽  
Rhodamine 101

Photochemical and Photophysical Properties of C60Dendrimers Studied by Laser Flash Photolysis

2002 ◽  
Vol 106 (29) ◽  
pp. 7193-7199 ◽  
Author(s):  
Ryouta Kunieda ◽  
Mamoru Fujitsuka ◽  
Osamu Ito ◽  
Miho Ito ◽  
Yasujiro Murata ◽  
...  
Keyword(s):  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Photophysical Properties ◽  
Laser Flash

Primary photochemical events in CdS semiconductor colloids as probed by picosecond laser flash photolysis

1989 ◽  
Vol 157 (5) ◽  
pp. 384-389 ◽  
Author(s):  
Prashant V. Kamat ◽  
Thomas W. Ebbesen ◽  
Nada M. Dimitrijević ◽  
A.J. Nozik
Keyword(s):  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Picosecond Laser ◽  
Laser Flash

Time-resolved nanosecond and picosecond absorption studies of excited-state properties of 1-thiobenzoylnaphthalene

1989 ◽  
Vol 67 (6) ◽  
pp. 967-972 ◽  
Author(s):  
R. Minto ◽  
A. Samanta ◽  
P.K. Das
Keyword(s):  
Rate Constants ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Picosecond Laser ◽  
Laser Flash ◽  
Quantum Yields ◽  
Pulse Excitation ◽  
Nanosecond Laser Pulse ◽  
Nanosecond Laser ◽  
Quenching Rate

1-Thiobenzoylnaphthalene (TBN), known for its pericyclization reaction from the lowest excited singlet state (S1), has been subjected to nanosecond and picosecond laser flash photolysis studies. The two major transients observed in the course of nanosecond laser pulse excitation are (i) the short-lived triplet characterized by two absorption maxima (400–410 and 740–750 nm) and submicrosecond intrinsic lifetimes (80–130 ns) and (ii) a relatively long-lived species (λmax = 520 nm and τ = 220–240 ns). Various triplet-related photophysical data of TBN, including self-quenching and bimolecular quenching rate constants, have been determined. The existence of a photochemical path from S1 manifests itself in low intersystem crossing quantum yields, particularly in the polar/hydrogen-bonding solvent, methanol. From the build-up of the triplet under picosecond excitation into S1 the lifetime of the latter is estimated to be ≤ 50 ps (in benzene). The fast intrinsic decay of TBN triplet is attributable to facile intra- and intermolecular photochemistry. The 520 nm transient species could not be definitively assigned, except that it is neither a triplet nor a triplet-derived product and that it arises via photochemistry from S1. Keywords: laser flash photolysis, triplet, transients, absorption maxima, lifetimes, quenching rate constants, photochemistry, 1-thiobenzoylnaphthalenes.

Photophysical properties of gatifloxacin in aqueous solution by laser flash photolysis and pulse radiolysis

2012 ◽  
Vol 81 (1) ◽  
pp. 40-45 ◽  
Author(s):  
Haixia Li ◽  
Peng Zhang ◽  
Yancheng Liu ◽  
Ruizhi Tang ◽  
Zhaoguo Xing ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Pulse Radiolysis ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Photophysical Properties ◽  
Laser Flash

Nanosecond and picosecond laser flash photolysis studies of 2,2′-dinitrodiphenylmethanes

1993 ◽  
Vol 70 (3) ◽  
pp. 245-251 ◽  
Author(s):  
T. Mathew ◽  
D. Ramaiah ◽  
C.P. Joshua ◽  
D. Weir ◽  
M.V. George
Keyword(s):  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Picosecond Laser ◽  
Laser Flash

Photophysical Properties of the Newly Synthesized Triad Based on [70]Fullerene Studies with Laser Flash Photolysis

2007 ◽  
Vol 111 (17) ◽  
pp. 4335-4341 ◽  
Author(s):  
Frédéric Oswald ◽  
Mohamed E. El-Khouly ◽  
Yasuyuki Araki ◽  
Osamu Ito ◽  
Fernando Langa
Keyword(s):  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Photophysical Properties ◽  
Laser Flash

Substituted Phosphorous Triazatetrabenzocorroles: Correlation Between Structure and Excited State Properties

2009 ◽  
Vol 62 (5) ◽  
pp. 434 ◽  
Author(s):  
Xian-Fu Zhang ◽  
Yakuan Chang ◽  
Yanling Peng ◽  
Fushi Zhang
Keyword(s):  
Quantum Yield ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Photophysical Properties ◽  
Laser Flash ◽  
Time Resolved Fluorescence ◽  
Absorption Properties ◽  
Strong Electron ◽  
Time Resolved ◽  
Triplet Formation

The photophysical properties of five novel phthalocyanine analogues, dihydroxy phosphorus(v) triazatetrabenzocorrole (PTBC) substituted with –NO2, –SO3H, OiPr, and –NH2, respectively, were studied by a combination of absorption, steady-state emission, time-resolved fluorescence, and laser flash photolysis. All substituents, even for the strong electron-donating –NH2, cause only a slight red shift of their absorption and emission maxima. These complexes are generally monomeric in organic solution, whereas the sulfonated derivative, PTBC(SO3H)4, slightly aggregates in aqueous buffer. Distinct from phthalocyanines, PTBCs substituted with –NO2 or –NH2 still show high photo activities. The electron-withdrawing –NO2 and –SO3H decrease the fluorescence quantum yield but increase the triplet formation yield to 0.76 and 0.82, respectively. All PTBCs have long triplet lifetimes and hence generate singlet oxygen efficiently with a quantum yield from 0.43 to 0.75. Together with the ground-state absorption properties, the results suggest that these PTBCs may be used as excellent photosensitizers for photodynamic therapy.

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