ESR line shape studies of trapped electrons in γ-irradiated 17O enriched 10M NaOH alkaline ice glass: Model for the geometrical structure of the trapped electron

1976 ◽  
Vol 64 (8) ◽  
pp. 3153 ◽  
Author(s):  
S. Schlick
Keyword(s):  
Line Shape ◽  
Geometrical Structure ◽  
Trapped Electrons ◽  
Glass Model ◽  
Trapped Electron

A photoconductivity study of trapped electrons in γ-irradiated hydrocarbon glasses at 77 K

1983 ◽  
Vol 61 (12) ◽  
pp. 2799-2803 ◽  
Author(s):  
Naoto Okabe ◽  
Toyoaki Kimura ◽  
Kenji Fueki
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Conduction Band ◽  
Ground State ◽  
Volume Ratio ◽  
Optical Absorption Spectra ◽  
Trapped Electrons ◽  
Trapped Electron

Photoconductivity spectra of trapped electrons in γ-irradiated 3-methylpentane, 2-methylpentane, 3-methylheptane, and 3-methylpentane–methylcyclohexane (1:9 volume ratio) glasses at 77 K were measured. From the comparison of photoconductivity and optical absorption spectra in these systems we have obtained relative values of quantum efficiencies for a trapped electron in the ground state to be excited to the conduction band by photo-induced transition. For electrons stably trapped, we have measured the ranges of trap depths from the shallowest to the deepest in these systems.

scholarly journals Collisionless microinstabilities in stellarators. Part 4. The ion-driven trapped-electron mode

2017 ◽  
Vol 83 (4) ◽  
Author(s):  
G. G. Plunk ◽  
J. W. Connor ◽  
P. Helander
Keyword(s):  
Free Energy ◽  
Density Gradient ◽  
Magnetic Confinement ◽  
Particle Trapping ◽  
Trapped Electrons ◽  
Particle Orbits ◽  
Electron Mode ◽  
Gyrokinetic Simulations ◽  
Trapped Electron

Optimised stellarators and other magnetic-confinement devices having the property that the average magnetic curvature is favourable for all particle orbits are called maximum-$J$ devices. They have recently been shown to be immune to trapped-particle instabilities driven by the density gradient. Gyrokinetic simulations reveal, however, that another instability can arise, which is also associated with particle trapping but causes less transport than typical trapped-electron modes. The nature of this instability is clarified here. It is shown to be similar to the ‘ubiquitous mode’ in tokamaks and is driven by ion free energy, but requires trapped electrons to exist.

scholarly journals Trapped-electron runaway effect

2015 ◽  
Vol 81 (4) ◽  
Author(s):  
E. Nilsson ◽  
J. Decker ◽  
N. J. Fisch ◽  
Y. Peysson
Keyword(s):  
Electric Field ◽  
Strong Electric Field ◽  
Velocity Spectrum ◽  
Trapped Electrons ◽  
Radial Extent ◽  
Trapped Electron

In a tokamak, trapped electrons subject to a strong electric field cannot run away immediately, because their parallel velocity does not increase over a bounce period. However, they do pinch toward the tokamak center. As they pinch toward the center, the trapping cone becomes more narrow, so eventually they can be detrapped and run away. When they run away, trapped electrons will have a very different signature from circulating electrons subject to the Dreicer mechanism. The characteristics of what are called trapped-electron runaways are identified and quantified, including their distinguishable perpendicular velocity spectrum and radial extent.

Electron trapping in alcohol clusters in γ-irradiated n-propanol–hydrocarbon glasses at 77 K

1981 ◽  
Vol 59 (18) ◽  
pp. 2803-2807 ◽  
Author(s):  
Masaya Ito ◽  
Toyoaki Kimura ◽  
Kenji Fueki
Keyword(s):  
Optical Absorption ◽  
Electron Trapping ◽  
Hydrocarbon Mixture ◽  
Absorption Method ◽  
Trapped Electrons ◽  
Hydrocarbon Traps ◽  
Major Process ◽  
The Matrix ◽  
Electron Migration ◽  
Trapped Electron

A study has been made of trapped electrons in n-propanol–hydrocarbon mixture glasses at 77 K by the optical absorption method. The yields of electrons trapped in alcohol clusters (ealc−) were measured for several γ-irradiated n-propanol–hydrocarbon glasses, where the yields of trapped electrons in these neat hydrocarbon glasses at 77 K are known to range from 0.015 to 1.1 G units. The results show that the yields of ealc– in the mixture glasses do not depend on the trapped electron yields in neat hydrocarbon glasses. Thus, it is concluded that electron migration from relaxed hydrocarbon matrix traps into alcohol clusters is not the major process for ealc− formation in the systems studied here. The major process for ealc− formation may be attributed to quasi-free electron scavenging by alcohol clusters and electron migration from unrelaxed hydrocarbon traps into alcohol clusters. Both ir-induced and isothermal changes in the ealc− yield have also been investigated. These investigations indicate that there is a correlation between the observed change in the ealc− yield and the matrix viscosity.

Effect of an external electric field on the yield of trapped electrons in a γ-irradiated hydrocarbon glass

1977 ◽  
Vol 55 (23) ◽  
pp. 3973-3977 ◽  
Author(s):  
Noriyuki Kato ◽  
Toyoaki Kimura ◽  
Kenji Fueki
Keyword(s):  
Optical Absorption ◽  
Electric Field ◽  
External Electric Field ◽  
Absorption Spectroscopy ◽  
Experimental Results ◽  
Optical Absorption Spectroscopy ◽  
Geminate Recombination ◽  
Trapped Electrons ◽  
Trapped Electron

Trapped electron yields were measured by means of optical absorption spectroscopy for a hydrocarbon glass γ-irradiated at 77 K in the presence of an external electric field. It was observed that the yield of trapped electrons increased in the presence of an external electric field as compared with that in the absence of an external electric field. The experimental results were analyzed theoretically and interpreted as due to overall effects involving changes in geminate recombination times which were caused by an external electric field.

Effect of Dose on the Yield of Trapped Electrons in Aliphatic Amine Glasses

1973 ◽  
Vol 51 (16) ◽  
pp. 2801-2804 ◽  
Author(s):  
Toshiyasu Ito ◽  
Shoji Noda ◽  
Kenji Fueki ◽  
Zen-Ichiro Kuri
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Aliphatic Amine ◽  
Trapped Electrons ◽  
Electron Yield ◽  
Spin Resonance ◽  
Trapped Electron

An electron spin resonance (e.s.r.) and photoconductivity study has been made of the effect of dose on the yield of trapped electrons in -γ-irradiated aliphatic amine glasses at 77 °K. It is shown that the effect of dose on the trapped electron yield can be correlated with matrix polarity.

Effects of trapped electrons on the line shape in emission Mössbauer spectra

2006 ◽  
Vol 167 (1-3) ◽  
pp. 881-885 ◽  
Author(s):  
Yu. D. Perfiliev ◽  
V. S. Rusakov ◽  
L. A. Kulikov ◽  
A. A. Kamnev ◽  
K. Alkhatib
Keyword(s):  
Line Shape ◽  
Mössbauer Spectra ◽  
Trapped Electrons ◽  
Mossbauer Spectra
Sign in / Sign up

Export Citation Format

Share Document