Model potential approach for positron-atom collisions. I. Positronium formation in ground state in alkali atoms Na, K, Rb and Cs using the distorted-wave approximation

1980 ◽  
Vol 13 (9) ◽  
pp. 1919-1935 ◽  
Author(s):  
S Guha ◽  
P Mandal
Keyword(s):  
Ground State ◽  
Model Potential ◽  
Positronium Formation ◽  
Distorted Wave ◽  
Potential Approach ◽  
Wave Approximation ◽  
Alkali Atoms

scholarly journals Ground State Positronium Formation Cross Sections for Scattering of Positrons from Li

1991 ◽  
Vol 44 (5) ◽  
pp. 515 ◽  
Author(s):  
KK Mukherjee ◽  
N Ranjit Singh ◽  
Keka Basu Choudhury ◽  
PS Mazumdar ◽  
S Brajamani
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Ground State ◽  
Positronium Formation ◽  
Distorted Wave ◽  
Total Cross Sections ◽  
Wave Approximation ◽  
Theoretical Predictions

Total cross sections for positronium formation in e+-Li scattering have been studied in the framework of the distorted wave approximation in the energy range 1-50 eV by taking consistent account of the effect of the target distortion. The results are compared with existing theoretical predictions.

Alkali atoms confined to a sphere and to a fullerene cage

2005 ◽  
Vol 83 (9) ◽  
pp. 919-928 ◽  
Author(s):  
S H Patil ◽  
K D Sen ◽  
Y P Varshni
Keyword(s):  
Ground State ◽  
Model Potential ◽  
Alkali Atom ◽  
Dipole Polarizability ◽  
Fullerene Cage ◽  
Barrier Potential ◽  
Correct Model ◽  
Alkali Atoms ◽  
Infinite Barrier ◽  
03.65 Ge

A simple asymptotically correct model potential is considered for the valence electron in an alkali atom. Superposed with the confining infinite barrier potential, this potential yields the energies of various states and the dipole polarizability of the ground state of the confined alkali atom. Superposed with the fullerene shell potential, this potential yields the energies of the alkali atom inside a fullerene cage. Numerical results are presented for Li, Na, K, Rb, and Cs under such confinements. PACS Nos.: 03.65.Ge, 73.21.La, 78.67.Hc

Distorted wave calculation of the positronium formation in positron-sodium and positron-potassium scattering

1998 ◽  
Vol 08 (04) ◽  
pp. 217-224
Author(s):  
K. B. Choudhury ◽  
M. Bhattacharya ◽  
N. C. Deb ◽  
N. R. Singh ◽  
M. B. Singh ◽  
...  
Keyword(s):  
Cross Sections ◽  
Positronium Formation ◽  
Distorted Wave ◽  
Total Cross Sections ◽  
Wave Approximation ◽  
Experimental Findings ◽  
Wave Calculation

Total cross sections for the positronium formation in the ground ( n =1) and excited ( n =2) states in e+ - Na and e+ - K scattering have been studied within the framework of a distorted wave approximation. The present results have been compared with other theoretical and experimental findings.

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.

scholarly journals Positronium Formation Cross Sections for Scattering of Positrons from Potassium and Rubidium

1994 ◽  
Vol 47 (3) ◽  
pp. 265
Author(s):  
N Ranjit Singh ◽  
NC Deb ◽  
Th Subodh Chandra Singh ◽  
M Babuyaima Singh ◽  
PS Mazumdar
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Positronium Formation ◽  
Distorted Wave ◽  
Total Cross Sections ◽  
Wave Approximation ◽  
Theoretical Results

Total cross sections for positronium formation in positron-potassium and positron-rubidium scattering have been calculated in a distorted wave approximation for incident positrons in the energy range 1 to 50 eV. The present results are compared with other theoretical results and with measurement where available.

Electron impact ionization of the ground state of singly ionized helium

2000 ◽  
Vol 78 (10) ◽  
pp. 901-906 ◽  
Author(s):  
M Bhattacharya ◽  
N C Deb ◽  
A Z Msezane ◽  
P S Mazumdar
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Differential Cross ◽  
Ground State ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Experimental Results ◽  
Distorted Wave ◽  
Wave Approximation ◽  
34.50 Fa

We calculate the total and single differential cross sections for the electron impact ionization of the ground state of singly ionized helium at various energies in a distorted wave approximation. Present results are compared with existing theoretical and experimental results. PACS Nos.: 34.80.Dp, 34.50.Fa

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