Direct determination of the quantum yield of hydroxyl radicals in the laser photolysis of formic acid at 222 nm

1987 ◽  
Vol 91 (13) ◽  
pp. 3463-3465 ◽  
Author(s):  
Gurvinder S. Jolly ◽  
Donald L. Singleton ◽  
George. Paraskevopoulos
Keyword(s):  
Quantum Yield ◽  
Formic Acid ◽  
Hydroxyl Radicals ◽  
Direct Determination ◽  
Laser Photolysis

Laser photolysis of HNO3 at 222 nm: Direct determination of the primary quantum yield of OH

1986 ◽  
Vol 84 (12) ◽  
pp. 6662-6667 ◽  
Author(s):  
G. S. Jolly ◽  
D. L. Singleton ◽  
D. J. McKenney ◽  
G. Paraskevopoulos
Keyword(s):  
Quantum Yield ◽  
Direct Determination ◽  
Laser Photolysis

ChemInform Abstract: Laser Photolysis of HNO3at 222 nm: Direct Determination of the Primary Quantum Yield of OH.

1986 ◽  
Vol 17 (38) ◽  
Author(s):  
G. S. JOLLY ◽  
D. L. SINGLETON ◽  
D. J. MCKENNEY ◽  
G. PARASKEVOPOULOS
Keyword(s):  
Quantum Yield ◽  
Direct Determination ◽  
Laser Photolysis

Determination of photonic efficiency and quantum yield of formaldehyde formation in the presence of various TiO2 photocatalysts

2001 ◽  
Vol 44 (5) ◽  
pp. 279-286 ◽  
Author(s):  
C. Wang ◽  
D.W. Bahnemann ◽  
J.K. Dohrmann
Keyword(s):  
Quantum Yield ◽  
Hydroxyl Radicals ◽  
Critical Concentration ◽  
Photon Flux ◽  
Tio2 Photocatalysts ◽  
Ph Values ◽  
Optimum Ph ◽  
Photonic Efficiency ◽  
True Quantum

Illumination of aqueous TiO2 suspentions yields hydroxyl radicals, which can be trapped by methanol producing formaldehyde (HCHO). In this work, the photonic efficiency and quantum yield of HCHO formation in colloidal TiO2 solutions and, P25 and UV 100 suspensions have been determined. Differences in photocatalytic activity of the three photocatalysts have been found and are discussed. The photonic efficiency of HCHO formation in the presence of P25 and UV 100 depends on the concentration of TiO2 and the pH. The critical concentration is 2.5 g/L. Below this, the photonic efficiency with P 25 is higher than with UV 100, and vice versa. Optimum pH values for P25 and UV 100 giving the maximum photonic efficiency are 7.7 and 10.4, respectively. Compared to P25 and UV 100, the true quantum yield of HCHO formation in colloidal TiO2 solution varies a little with pH and virtually does not change with the amount of loading of TiO2. The true quantum yield varies as the inverse square root of light intensity. The quantum yield increases from 0.02 to 0.08 when the absorbed photon flux decreases from 8.1 × 10-7 Ein/L s to 4.9 × 10-8 Ein/L s. A simple model is presented to explain the experimental observation.

A Direct Determination of the Direction for the Transition Dipole Moment by the Polarized Laser Photolysis of the Oriented CH3I Beam

1996 ◽  
Vol 100 (12) ◽  
pp. 4729-4733 ◽  
Author(s):  
Hiroshi Ohoyama ◽  
Tetsuya Ogawa ◽  
Hiroshi Makita ◽  
Toshio Kasai ◽  
Keiji Kuwata
Keyword(s):  
Dipole Moment ◽  
Direct Determination ◽  
Transition Dipole Moment ◽  
Laser Photolysis ◽  
Transition Dipole
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