Bimolecular Homolytic Substitution (SH2) Reactions with Hydrogen Atoms. Time-Resolved Electron Spin Resonance Detection in the Pulse Radiolysis of α-(Methylthio)acetamide

2004 ◽  
Vol 126 (44) ◽  
pp. 14468-14474 ◽  
Author(s):  
Pawel Wisniowski ◽  
Krzysztof Bobrowski ◽  
Ian Carmichael ◽  
Gordon L. Hug
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Pulse Radiolysis ◽  
Hydrogen Atoms ◽  
Time Resolved ◽  
Spin Resonance ◽  
Resonance Detection ◽  
Homolytic Substitution

scholarly journals Electron spin resonance detection of radicals and electrons condensed from water vapor after irradiation with 1 MeV helium ions

1968 ◽  
Vol 46 (10) ◽  
pp. 1747-1754 ◽  
Author(s):  
W. A. Seddon ◽  
D. R. Smith ◽  
P. E. Bindner
Keyword(s):  
Electron Spin Resonance ◽  
Water Vapor ◽  
Electron Spin ◽  
Ion Beam ◽  
Physical Parameters ◽  
Hydrogen Atoms ◽  
Beam Experiment ◽  
Spin Resonance ◽  
Vapor Stream ◽  
Resonance Detection

A stream of water vapor was irradiated in a "crossed-beam" experiment by 1 MeV He+ ions. After traversing the He+ ion beam, the vapor was condensed on a quartz tube at 77°K. The deposit so formed was then isolated under vacuum and transferred to an electron spin resonance (e.s.r.) spectrometer. E.s.r. spectra were observed that arise from species formed as a consequence of radiolysis in the vapor phase. Species trapped in the deposit were identified as HO2 radicals and electrons. Addition of CH3I and N2O gives results which indicate that hydrogen atoms were also formed although they do not become trapped in the deposit.The physical parameters of the experiment have been measured or calculated. These include the pressure and velocity of molecules in the vapor stream, and the time between irradiation and deposition on the cold finger.

Size, Hydration, and Shape of SDS/Heptane Micelles Investigated by Time-Resolved Fluorescence Quenching and Electron Spin Resonance

Langmuir ◽  
2001 ◽  
Vol 17 (22) ◽  
pp. 6765-6770 ◽  
Author(s):  
Radha Ranganathan ◽  
Miroslav Peric ◽  
Rosa Medina ◽  
Ulises Garcia ◽  
Barney L. Bales ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Fluorescence Quenching ◽  
Electron Spin ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Spin Resonance

Electron spin resonance detection of heterogeneous reactions of Pigment Red 122

1990 ◽  
Vol 68 (4) ◽  
pp. 640-643
Author(s):  
Mary Jane Walzak ◽  
John R. Harbour
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Radical Anion ◽  
Heterogeneous Reactions ◽  
Resonance Spectroscopy ◽  
G Factor ◽  
Spin Resonance ◽  
Two Component ◽  
Induced Signal ◽  
Resonance Detection

Electron spin resonance spectroscopy (ESR) has been used to investigate the electrochemical and photolytic behaviour of particulate C.I. Pigment Red 122. Heterogeneous electrochemical reduction and oxidation of the pigment resulted in different reversible ESR signals with the radical cation giving a signal of ΔHpp = 2.3 G and g-factor of 2.0033 and the radical anion giving ΔHpp = 3.2 G and g-factor 2.0039. On exposure to light the inherent ESR signal, which was determined to be a two-component signal, increased in intensity by a factor of 2.4 but did not change in linewidth or g-factor. This light-induced signal was reversible and decayed to initial levels in the dark. The mechanism of these reactions is discussed. Keywords: ESR, pigment, electrochemistry, photo effects.

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