Absorption spectrum, yield, and decay kinetics of the solvated electron in pulse radiolysis of liquid ammonia at various temperatures

1975 ◽  
Vol 79 (16) ◽  
pp. 1651-1654 ◽  
Author(s):  
Farhataziz ◽  
Lewis M. Perkey
Keyword(s):  
Absorption Spectrum ◽  
Pulse Radiolysis ◽  
Liquid Ammonia ◽  
Decay Kinetics ◽  
Solvated Electron ◽  
Kinetics Of

Étude par radiolyse pulsée des propriétés spectrales et cinétiques de l'électron solvaté dans l'hexane-1,2,6-triol liquide

1995 ◽  
Vol 73 (1) ◽  
pp. 117-122 ◽  
Author(s):  
J.-P. Jay-Gerin ◽  
J. Chevrel ◽  
C. Ferradini ◽  
E. Ray ◽  
M.H. Klapper ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Optical Absorption ◽  
Linear Accelerator ◽  
Pulse Radiolysis ◽  
Order Reaction ◽  
Kinetic Properties ◽  
Solvated Electron ◽  
Solvent Viscosity ◽  
First Order ◽  
Short Times

The optical absorption spectrum of the solvated electron (es−) in liquid hexane-1,2,6-triol has been measured by nanosecond pulse radiolysis at different temperatures (10–40 °C) to investigate the influence of high solvent viscosity values on the spectral and kinetic properties of es−. The wavelength at the absorption maximum, λmax, is equal to 560 nm, and its variation with temperature, if it exists in the considered zone, is less than the experimental error. At 20 °C and 150 ns, the value of the product [Formula: see text] of the yield of es− and the molar extinction coefficient at λmax is 2.55 × 104 molecule/(M cm 100 eV). In the context of this work, we have compared results obtained with both a linear accelerator and a Febetron, a comparison that has allowed us to evaluate the influence of variations of the dose per pulse and to extend measurements to short times. In the case of experiments performed with the linear accelerator, es− is found to decay at all wavelengths by a first-order reaction (or by a pseudo-first-order reaction) with an activation energy of ~45 kJ mol−1. By contrast, kinetic curves obtained with the Febetron seem to show a competition in which a second-order law is followed at short times. The fact that the shape of the spectra seems to vary as a function of the dose per pulse indicates the possible intervention of another species whose formation is favored by the use of high radiation doses. In other respects, the kinetics of electron solvation does not seem to be controlled by the viscosity of the solvent in our experimental conditions. Keywords: liquid hexane-1,2,6-triol, pulse radiolysis, linear accelerator and Febetron, solvated electron, optical absorption spectrum, kinetic properties, solvent viscosity, dose and temperature effects.

Absorption Spectrum and Decay Kinetics of the Metastable State of Chlorophyll b

Nature ◽  
1959 ◽  
Vol 183 (4662) ◽  
pp. 661-662 ◽  
Author(s):  
STIG CLAESSON ◽  
LARS LINDQVIST ◽  
BERTIL HOLMSTRÖM
Keyword(s):  
Absorption Spectrum ◽  
Metastable State ◽  
Chlorophyll B ◽  
Decay Kinetics ◽  
Kinetics Of

Notizen: Pulse Radiolysis of Selenium Containing Compounds: Selenomethionine

1974 ◽  
Vol 29 (7-8) ◽  
pp. 571-572 ◽  
Author(s):  
Maurizio Tamba ◽  
Sergio Bonora ◽  
Roberto Badiello
Keyword(s):  
Optical Absorption ◽  
Aqueous Solutions ◽  
Absorption Spectra ◽  
Pulse Radiolysis ◽  
Oh Radicals ◽  
Optical Absorption Spectra ◽  
Transient Species ◽  
Decay Kinetics ◽  
Kinetics Of

The pulse radiolysis of aqueous solutions of selenomethionine has been studied under both neutral and acid conditions and the transient optical absorption spectra have been observed. The reactivities of both eāq and OH radicals have been measured as well as the formation and the decay kinetics of the transient species.

Pulse radiolysis of ethanol

1970 ◽  
Vol 48 (11) ◽  
pp. 1645-1650 ◽  
Author(s):  
J. W. Fletcher ◽  
P. J. Richards ◽  
W. A. Seddon
Keyword(s):  
Pulse Radiolysis ◽  
Order Rate Constant ◽  
Radiation Chemistry ◽  
Square Root ◽  
Decay Kinetics ◽  
Solvated Electron ◽  
First Order ◽  
Computer Calculations ◽  
Pseudo First Order ◽  
Positive Ion

The radiation chemistry of ethanol has been investigated by pulse radiolysis with emphasis on the decay kinetics and yield of the solvated electron, e−EtOH, in neutral and alkaline solution. Computer calculations show that the experimental data are most consistent with a yield G(e−EtOH) = 1.7 molecules/100 eV, and a pseudo first-order half life for e−EtOH, [Formula: see text] which corresponds to a second-order rate constant k(e− + EtOH) = 7 × 103 M−1 s−1.Rates of reaction of the electron with acetaldehyde and C6F12 have been determined to be 4.0 ± 0.5 × 109 and 2.5 ± 0.5 × 109 M−1 s−1, respectively.The empirical square root formula for spur scavenging kinetics[Formula: see text]is obeyed for scavenging of the radiation produced positive ion.

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