The electron impact induced fragmentation of aromatic aldoximes—III. On the loss of HCNO, OH⋅ and substituents and the role of substituent effects in the decomposition of cyclohexadiene type intermediate ions

1977 ◽  
Vol 12 (4) ◽  
pp. 245-253 ◽  
Author(s):  
Peter C. Vijfhuizen ◽  
Johan K. Terlouw
Keyword(s):  
Electron Impact ◽  
Substituent Effects ◽  
Type Intermediate

scholarly journals Few Body Effects in the Electron and Positron Impact Ionization of Atoms

Atoms ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 33
Author(s):  
R.I. Campeanu ◽  
Colm T. Whelan
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Differential Cross ◽  
Impact Ionization ◽  
Inert Gas ◽  
Interference Effects ◽  
Positron Impact ◽  
Competing Interactions ◽  
Energy Sharing

Triple differential cross sections (TDCS) are presented for the electron and positron impact ionization of inert gas atoms in a range of energy sharing geometries where a number of significant few body effects compete to define the shape of the TDCS. Using both positrons and electrons as projectiles has opened up the possibility of performing complementary studies which could effectively isolate competing interactions that cannot be separately detected in an experiment with a single projectile. Results will be presented in kinematics where the electron impact ionization appears to be well understood and using the same kinematics positron cross sections will be presented. The kinematics are then varied in order to focus on the role of distortion, post collision interaction (pci), and interference effects.

scholarly journals The Semiclassical Limit of the Gailitis Formula Applied to Electron Impact Broadening of Spectral Lines of Ionized Atoms

Atoms ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 29
Author(s):  
Sylvie Sahal-Bréchot
Keyword(s):  
Electron Impact ◽  
Classical Limit ◽  
Semiclassical Limit ◽  
Spectral Lines ◽  
Stark Broadening ◽  
Feshbach Resonances

The present paper revisits the determination of the semi-classical limit of the Feshbach resonances which play a role in electron impact broadening (the so-called “Stark“ broadening) of isolated spectral lines of ionized atoms. The Gailitis approximation will be used. A few examples of results will be provided, showing the importance of the role of the Feshbach resonances.

Electron-impact ionization ofNe(2p)andAr(3p)at intermediate energies: Role of the postcollision interaction

2017 ◽  
Vol 96 (5) ◽  
Author(s):  
Xiaoqing Hu ◽  
Cong-Zhang Gao ◽  
Zhanbin Chen ◽  
Jianguo Wang ◽  
Yong Wu ◽  
...  
Keyword(s):  
Electron Impact ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Intermediate Energies

Production and Emissions of Atomic Carbon and Oxygen in the Inner Coma of Comet Halley: Role of Electron Impact

Icarus ◽  
1996 ◽  
Vol 120 (2) ◽  
pp. 412-430 ◽  
Author(s):  
A. Bhardwaj ◽  
S.A. Haider ◽  
R.P. Singhal
Keyword(s):  
Electron Impact ◽  
Atomic Carbon ◽  
Comet Halley

Electronic substituent effects in the electron impact mass spectrometry of 2-(arylazo)-4-phenylphenols

2005 ◽  
Vol 19 (18) ◽  
pp. 2563-2568 ◽  
Author(s):  
Guadalupe Pérez-Caballero ◽  
Federico Jiménez-Cruz ◽  
Pablo Hernández Matamoros ◽  
José Guadalupe García ◽  
Fernando Cortés-Guzmán ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Substituent Effects ◽  
Electron Impact Mass Spectrometry ◽  
Electron Impact Mass ◽  
Impact Mass

On the Mechanism and Substituent Effects of the Tl(III) Oxidation of Phenylethylenes in Methanol

1973 ◽  
Vol 51 (14) ◽  
pp. 2366-2374 ◽  
Author(s):  
L. Nadon ◽  
M. Tardat ◽  
M. Zador ◽  
S. Fliszar
Keyword(s):  
Substituent Effects ◽  
Oxidation Products ◽  
Rate Determining Step ◽  
Mechanism Of Reaction

The oxidation of phenylethylenes by Tl(NO3)3 in methanol proceeds rapidly and selectively to give the products resulting from the migration of aryl groups, i.e., (i) the 1,1-dimethoxy-2-phenylethanes from the corresponding styrenes, (ii) the phenylacetones from the α-methylstyrenes, and (iii) the two possible deoxybenzoines from the 1,1,-diphenylethylenes. The kinetic results, which indicate the formation of the thallic–organic intermediate to be the rate determining step, are discussed in terms of the mechanism of reaction and show the role of the coordination of Tl(III). Hammett's relationship, with ρ = −4.2, describes the substituent effects for the competitive oxidation of ring-substituted styrenes and α-methylstyrenes. The relative migratory aptitudes of aryl groups, as determined from the oxidation products of ring-substituted 1,1-diphenylethylenes, is correlated to Brown's σ+ constants, with ρ+ = −2.27.

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