Journal of Photochemistry 

About: Journal of Photochemistry is an academic journal. The journal publishes majorly in the area(s): Excited state & Quantum yield. Over the lifetime, 1779 publications have been published receiving 23049 citations.

Photoelectrochemistry and heterogeneous photo-catalysis at semiconductors

Abstract: The principles and applications of semiconductor electrodes in photo-electrochemical (PEC) cells (liquid junction photovoltaic, photoelectro-synthetic, photocatalytic) are described. Factors important to the design of practical systems and the extension of the principles of PEC cells to particulate systems for carrying out heterogeneous photocatalysis and photosynthesis are discussed. A “dual n-type semiconductor” model of biological photo-synthesis is proposed and possible means of utilization of such a system is described.

Photophysics of some common fluorescence standards

Abstract: An accurate study of the fluorescence decay and fluorescence quantum yield of three fluorescence standards is made. From data on 9,10-diphenylanthracene it is concluded that (a) the refractive index squared correction employed in relative quantum yield measurements in right-angle fluorometers is valid, (b) a refractive index squared term is required for the valid comparison of radiative lifetimes of the same molecule measured in different solvents and (c) the fluorescence quantum yield is less than unity and is essentially independent of the solvent (φ F = 0.93 ± 0.03 in four non-polar solvents). Further results are presented on the complex kinetics of the fluorescence decay of quinine bisulphate in aqueous H 2 SO 4 solutions; a model is proposed which accounts adequately for these observations. Some results are presented for 2-aminopyridine in aqueous H 2 SO 4 solutions which suggest that this may also be a useful fluorescence standard; we measured φ F = 0.66 and τ F = 9.6 ns in both 1 and 0.1 N H 2 SO 4 solutions. However, disagreement about these values and the strong temperature dependence of φ F that is observed renders this compound less acceptable as a standard than quinine bisulphate in 1 N H 2 SO 4 solution.

The photophysics of rhodamine B

Abstract: The effects of solvent viscosity and dielectric constant on the photophysics of rhodamine B in its protonated and zwitterion forms were studied. The internal conversion rate is dependent on the S 1 -S 0 energy separation and increases when this gap is lowered through rotation of the diethylamino groups. Comparison is made with rhodamine 640 in which torsional motion about the C—N bond is not possible.

Further evidence for rotation in the π,π and inversion in the n,π photoisomerization of azobenzenes

Abstract: Photoisomerisation cis-trans d'un ether crown «coiffe» d'un azobenzene. Rendements quantiques d'isomerisation trans-cis et cis-trans a 313 et 436 nm. Comparaisons avec l'azobenzene et les derives acetyl-4, nitro-3 et dimethyl-3,3' azobenzenes