Stokes parameters for the electron-impact excitation of the state of zinc atom

2014 ◽  
Vol 378 (7-8) ◽  
pp. 641-643 ◽  
Author(s):  
Tapasi Das ◽  
Dipti ◽  
Rajesh Srivastava
Keyword(s):  
Electron Impact ◽  
The State ◽  
Zinc Atom ◽  
Stokes Parameters ◽  
Impact Excitation ◽  
Electron Impact Excitation

Rate coefficients for electron impact excitation of the state of CO

2012 ◽  
Vol 405 ◽  
pp. 16-21 ◽  
Author(s):  
M.M. Ristić ◽  
M. Vojnović ◽  
G.B. Poparić ◽  
D.S. Belić
Keyword(s):  
Electron Impact ◽  
The State ◽  
Impact Excitation ◽  
Rate Coefficients ◽  
Electron Impact Excitation

Polarization and orientation in electron impact excitation to Ne*(2p53p) states

1996 ◽  
Vol 74 (11-12) ◽  
pp. 897-905 ◽  
Author(s):  
A. W. Baerveldt ◽  
W. B. Westerveld ◽  
J. van Eck ◽  
H. G. M. Heideman
Keyword(s):  
Angular Momentum ◽  
Electron Impact ◽  
Excited States ◽  
Electron Scattering ◽  
Total Angular Momentum ◽  
Stokes Parameters ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Theoretical Discussion ◽  
Excitation Mechanism

The electron impact excitation of ground-state neon atoms to several, generally not LS-coupled, Ne*(2p53p) states is studied by electron-polarized photon coincidence experiments on the Ne*(2p53p) → Ne*(2p53s) decay radiation. For four transitions the Stokes' parameters P1 to P4 are published at fixed incident electron energies of 50 and 80 eV and in the electron scattering range of 22°–70°. A theoretical discussion is presented to show how information about the collision process can be extracted from the experimental results. For excitation to the three excited states with total angular momentum J = 2 the behaviour of the total angular momentum transfer [Formula: see text] as a function of the electron-scattering angle at 50 eV strongly suggests a common excitation mechanism.

Excitation of the 3D states of helium by electrons and positrons

1996 ◽  
Vol 74 (7-8) ◽  
pp. 509-517 ◽  
Author(s):  
Surbhi Verma ◽  
Rajesh Srivastava
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Ground State ◽  
Stokes Parameters ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Distorted Wave ◽  
Positron Impact ◽  
Wave Approximation ◽  
Electrons And Positrons

Distorted-wave approximation calculations were carried out for the electron-impact excitation of 31,3D states from the 11S ground state of helium. Results are presented at an electron energy of 40 eV for the Stokes parameters P1-P4; coherence parameters Pl, γ, [Formula: see text], ρ00; and differential cross sections where most other theoretical and experimental data are available for comparison. The calculation is further extended to the positron-impact 11S–31D excitation in helium and comparison with the corresponding electron-impact results is discussed.

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