scholarly journals Quantum yield of Cl* (2P1/2) production in the gas phase photolysis of CCl4 in the ultraviolet

2006 ◽  
Vol 118 (4) ◽  
pp. 341-344 ◽  
Author(s):  
Manish Tak ◽  
Manabendra Chandra ◽  
Dulal Senapati ◽  
Puspendu K. Das
Keyword(s):  
Quantum Yield ◽  
Gas Phase

High Quantum Yield Dual Emission from Gas-Phase Grown Crystalline Si Nanoparticles

2014 ◽  
Vol 118 (19) ◽  
pp. 10375-10383 ◽  
Author(s):  
A. M. P. Botas ◽  
R. A. S. Ferreira ◽  
R. N. Pereira ◽  
R. J. Anthony ◽  
T. Moura ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Gas Phase ◽  
High Quantum Yield ◽  
Dual Emission ◽  
High Quantum ◽  
Si Nanoparticles

CONDITIONS FOR THE PHOTOCHEMICAL NITRATION OF BENZENE

1965 ◽  
Vol 43 (6) ◽  
pp. 1714-1719 ◽  
Author(s):  
David L. Bunbury
Keyword(s):  
Liquid Phase ◽  
Quantum Yield ◽  
Nitrogen Dioxide ◽  
Gas Phase ◽  
Dark Reaction ◽  
Gas Phases

The reaction of benzene and nitrogen dioxide to produce nitrobenzene has been studied in the liquid and gas phases, in the dark, and with irradiation by light of 439 mμ and of 366 mμ. The concentration of NO2 in the liquid was varied from 0.08 to 1.6 moles/1 and in the gas from 0.0035 to 0.053 moles/1. No nitrobenzene was produced under any conditions in the liquid phase. Nitrobenzene is produced in the gas phase at high NO2 concentrations with irradiation by 366 mμ light. The quantum yield is 0.2. At 439 mμ the quantum yield is not more than 0.02. There is a very small dark reaction. As the concentration of NO2 in the gas is reduced the yield of nitrobenzene falls off very rapidly and is zero at the lowest concentration used, both in dark and light.

Spectrofluorometric studies. III. Ortho- and para-difluorobenzene

1968 ◽  
Vol 46 (20) ◽  
pp. 3177-3182 ◽  
Author(s):  
J. L. Durham ◽  
G. P. Semeluk ◽  
I. Unger
Keyword(s):  
Quantum Yield ◽  
Gas Phase ◽  
Corner Effect ◽  
Exciting Wavelength

Spectrofluorometric techniques have been used to determine gas phase singlet and triplet yields in ortho- and para-difluorobenzene as a function of exciting wavelength and pressure. The importance of the "around the corner effect" in such measurements as the cause of large errors is briefly discussed.In the case of ortho-difluorobenzene, maxima in fluorescent yield are produced by the exciting wavelengths 2490, 2580, and 2700 Å; minima at 2540 and 2660 Å. Triplet yields, using the sensitized biacetyl emission technique, have been determined at 2500, 2580, 2660, and 2700 Å. The sums of the singlet and triplet yields at these wavelengths are 0.34, 0.52, 0.75, and 0.97 respectively.Para-difluorobenzene has the largest quantum yield of fluorescence of any fluorinated benzene yet examined. The fluorescent yield shows only one definite minimum at 2740 Å. Triplet yields have been determined at 2660, 2740, and 2760 Å. The sums of the singlet and triplet yields at these wavelengths are 0.5, 0.5, and 0.7 respectively.

Quantum yield and total pressure effect in perfluoroglutaric anhydride photolysis in the gas phase

1985 ◽  
Vol 30 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Gerardo A. Argüello ◽  
Esther R. de Staricco ◽  
Eduardo H. Staricco
Keyword(s):  
Quantum Yield ◽  
Gas Phase ◽  
Total Pressure ◽  
Pressure Effect

Absolute chlorine atom quantum yield measurements in the UV and VUV gas-phase laser photolysis of CCl4

2003 ◽  
Vol 368 (3-4) ◽  
pp. 445-451 ◽  
Author(s):  
Alexander Hanf ◽  
Almuth Läuter ◽  
Hans-Robert Volpp
Keyword(s):  
Quantum Yield ◽  
Gas Phase ◽  
Chlorine Atom ◽  
Laser Photolysis

The photolysis of 2,3- and 3,3-dimethyl-1-butene at 147.0 and 184.9 nm

1985 ◽  
Vol 63 (1) ◽  
pp. 62-67 ◽  
Author(s):  
Hélène Deslauriers ◽  
Guy J. Collin
Keyword(s):  
Quantum Yield ◽  
Gas Phase ◽  
Electronic State ◽  
Photon Energy ◽  
Low Pressure ◽  
Decomposition Process ◽  
Primary Decomposition ◽  
Primary Process ◽  
The One

The photofragmentation of 2,3-dimethylbutene and 3,3-dimethylbutene has been studied at 147 and 184.9 nm in the gas phase. The main primary decomposition process at both wavelengths involves the rupture of a β(C—C) bond. The quantum yield for this process is higher than 0.7 at 147 nm and is probably even higher at 184.9 nm. All dimethallyl radicals formed at 147 nm in this process decompose at low pressure, but some of them isomerize from the α,β- to the α,α- structure (and vice versa) — via a 1,4-H transfer — before decomposition. At 184.9 nm, the same primary process is used to get a rough value for the lifetime of the photoexcited molecule, compared with the one made with RRKM calculations by assuming that all the photon energy resides in the vibrational framework of the fundamental electronic state. These lifetimes are about one nanosecond or less.

Photoluminescence: Routes to Achieving High Quantum Yield Luminescence from Gas-Phase-Produced Silicon Nanocrystals (Adv. Funct. Mater. 21/2011)

2011 ◽  
Vol 21 (21) ◽  
pp. 4041-4041 ◽  
Author(s):  
Rebecca J. Anthony ◽  
David J. Rowe ◽  
Matthias Stein ◽  
Jihua Yang ◽  
Uwe Kortshagen
Keyword(s):  
Quantum Yield ◽  
Gas Phase ◽  
Silicon Nanocrystals ◽  
High Quantum Yield ◽  
High Quantum

Routes to Achieving High Quantum Yield Luminescence from Gas-Phase-Produced Silicon Nanocrystals

2011 ◽  
Vol 21 (21) ◽  
pp. 4042-4046 ◽  
Author(s):  
Rebecca J. Anthony ◽  
David J. Rowe ◽  
Matthias Stein ◽  
Jihua Yang ◽  
Uwe Kortshagen
Keyword(s):  
Quantum Yield ◽  
Gas Phase ◽  
Silicon Nanocrystals ◽  
High Quantum Yield ◽  
High Quantum

Quantum yield in the gas phase photolysis of perfluoroacetyl chloride: a comparison with related compounds

1995 ◽  
Vol 86 (1-3) ◽  
pp. 27-31 ◽  
Author(s):  
Daniel E. Weibel ◽  
Gerardo A. Arguello ◽  
Esther R. de Staricco ◽  
Eduardo H. Staricco
Keyword(s):  
Quantum Yield ◽  
Gas Phase ◽  
Related Compounds

Gas phase photochlorination of perfluorocyclohexene

1969 ◽  
Vol 47 (6) ◽  
pp. 1067-1069 ◽  
Author(s):  
J. J. Cosa ◽  
C. A. Vallana ◽  
E. H. Staricco
Keyword(s):  
Activation Energy ◽  
Quantum Yield ◽  
Gas Phase ◽  
Photochemical Reaction ◽  
Total Pressure ◽  
Square Root ◽  
Kcal Mole ◽  
Kinetics Of

The kinetics of the gas phase photochemical reaction between perfluorocyclohexene and chlorine was studied between 10 and 50 °C. The system was irradiated with light of 4360 Å. The rate of the photochlorination was independent of the perfluorocyclohexene pressure and of the total pressure. It was found to be proportional to the first power of the pressure of Cl2 and to the square root of the intensity of absorbed light. At 30 °C, the quantum yield was found to be 200 when the initial Cl2 pressure was 100 Torr, and intensity of light absorbed 9.89 × 10−9 einstein l−1s−1.An activation energy of 5.1 kcal/mole could be assigned to the reaction C6F10Cl + Cl2.

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