THE PHOTOLYSIS AND THE FLUORESCENCE OF PERFLUORO DIETHYL KETONE

1960 ◽  
Vol 38 (1) ◽  
pp. 104-111 ◽  
Author(s):  
G. Giacometti ◽  
H. Okabe ◽  
S. J. Price ◽  
E. W. R. Steacie
Keyword(s):  
Photochemical Reaction ◽  
Strong Dependence ◽  
Wavelength Region ◽  
Fluorescence Yield ◽  
Fluorescence Band ◽  
Reaction Products ◽  
Concentration Region ◽  
Diethyl Ketone ◽  
Photochemical Yield ◽  
Primary Photochemical Reaction

The photolysis and the fluorescence of C2F5COC2F5 have been studied at various temperatures, concentrations, and wavelengths. There is a strong dependence of the photochemical yield and to a lesser extent of the relative fluorescence yield on these factors. The reaction products are solely CO and C4F10. The fluorescence is excited by light of the wavelength region between 2537 Å and 3650 Å. The fluorescence band lies in almost the same wavelength region as that of CF3COCF3 and the relative fluorescence yield is slightly less in the higher concentration region. This behavior closely follows the pattern for CF3COCF3 and, hence, may be discussed by the same mechanism. A comparison is made of the primary photochemical reaction among fluorinated ketones.

Mutagenicity assays of photochemical reaction products of biphenyl (BP) and o-phenylphenol (OPP) with NOx

Chemosphere ◽  
1981 ◽  
Vol 10 (2) ◽  
pp. 223-228 ◽  
Author(s):  
Teruhisa Hirayama ◽  
Motoshi Nohara ◽  
Hirohiko Shindo ◽  
Shozo Fukui
Keyword(s):  
Photochemical Reaction ◽  
Reaction Products

Mutagenicity of coal-pyrolyzed products and their photochemical reaction products with nitrogen oxides in Salmonella typhimurium TA98 and TA100

1983 ◽  
Vol 122 (3-4) ◽  
pp. 273-278 ◽  
Author(s):  
Teruhisa Hirayama ◽  
Motoshi Nohara ◽  
Takayasu Ando ◽  
Masaru Tanaka ◽  
Kimiko ◽  
...  
Keyword(s):  
Nitrogen Oxides ◽  
Salmonella Typhimurium ◽  
Photochemical Reaction ◽  
Reaction Products

Photochemical Reaction of Mo(CO)6with Et2GeH2: NMR and DFT Studies of Reaction Products; Crystal Structure of a Novel Complex [{Mo(μ-η2-H−GeEt2)(CO)4}2]

2009 ◽  
Vol 28 (20) ◽  
pp. 5857-5865 ◽  
Author(s):  
Magdalena Zyder ◽  
Andrzej Kochel ◽  
Jarosław Handzlik ◽  
Teresa Szymańska-Buzar
Keyword(s):  
Crystal Structure ◽  
Photochemical Reaction ◽  
Dft Studies ◽  
Reaction Products ◽  
Novel Complex

Wavelength controlled production of SO4- radicals in the ultraviolet photolysis of ceric sulfate solutions

1984 ◽  
Vol 37 (3) ◽  
pp. 475 ◽  
Author(s):  
RW Matthews
Keyword(s):  
Rate Constants ◽  
Photochemical Reaction ◽  
Transfer Reaction ◽  
Quantum Yields ◽  
Oh Radical ◽  
Transfer Energy ◽  
Fluorescence Measurements ◽  
Sulfate Solutions ◽  
Ultraviolet Photolysis ◽  
Primary Photochemical Reaction

Solutions of cerium(III)/(IV) and formic acid in 0.4 M sulfuric acid have been photolysed under 254 nm and 365 nm light. Marked differences in the reaction kinetics and quantum yields are observed at the two different wavelengths. At 365 nm, the reactions leading to cerium(IV) reduction are caused almost exclusively by the SO4- radical. The ratio of rate constants, k(SO4- + CeIII)/ k(SO4- + HCOOH), is 116 � 11 and the quantum yield of sulfate radicals, ф(SO4-), is 0.023 � 0.002. At 254 nm, the reactions leading to cerium(IV) reduction are caused mainly by the OH radical, but approximately 35% of the oxidizing radicals formed in the primary photochemical reaction are SO4-. Cerium(III) species, excited at 254 nm, transfer energy to cerium(IV) and this results in an additional yield of OH and SO4- radicals. Fluorescence measurements confirmed the efficiency of the energy transfer reaction. The ratio of rate constants, k(OH+CeIII)/k(OH+HCOOH), is 2.22 � 0.18 and ф(CeIV*) and ф(CelIII*) giving oxidizing radicals are 0.116 � 0.010 and 0.0083 � 0.0008 respectively. Thus about 5 times more total oxidizing radicals are produced from excited cerium(IV) species at 254 nm than at 365 nm.

scholarly journals Nonlinear Optical Properties of Spheroidal Metallic Inclusions in a Dielectric Medium

2011 ◽  
Vol 2011 ◽  
pp. 1-9
Author(s):  
Bernard de Dormale ◽  
Vo-Van Truong
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Symmetry Axis ◽  
Rotational Symmetry ◽  
Strong Dependence ◽  
Wavelength Region ◽  
Nonlinear Optical Properties ◽  
Linear Absorption ◽  
Direction Parallel ◽  
Depolarization Factor

A model for linear and nonlinear optical properties of a composite material consisting of spheroidal metal inclusions embedded in a host medium has been formulated using an effective medium approach. Both aligned and randomly oriented spheroids have been considered, and the results obtained showed a considerable difference between the two situations. Numerical calculations for metallic Au inclusions in a glass matrix have shown that the linear absorption in the case of aligned spheroids with their symmetry axis parallel to the z-axis is largely dependent on the depolarization factor, exhibiting an absorption in the vicinity of 500 nm when the depolarization factor in the direction parallel to the rotational symmetry axis is small. This structure shifts progressively to higher wavelengths when this depolarization factor is increased. In the case of randomly oriented spheroids, contributions from the different particle depolarization factors are present and prominent structures in the linear absorption appear in the long wavelength region, beyond 700 nm. Nonlinear optical properties for both aligned and randomly oriented spheroids also show a strong dependence on the depolarization factor and significant enhancements of these properties can be observed, suggesting possible tailoring of composite properties for various applications.

Investigation of photochemical reaction products of glucose formed during direct UV detection in CE

2015 ◽  
Vol 37 (7-8) ◽  
pp. 947-953 ◽  
Author(s):  
Thomas Schmid ◽  
Markus Himmelsbach ◽  
Wolfgang W. Buchberger
Keyword(s):  
Photochemical Reaction ◽  
Uv Detection ◽  
Reaction Products ◽  
Direct Uv Detection
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