scholarly journals Evidences of the participation of excited states in the positronium formation mechanism in Sm1-xEux(dpm)3 and Gd1-xEux(dpm)3 solid solutions

2019 ◽  
Author(s):  
Fernando Fulgêncio ◽  
Rafael Sábio ◽  
Sidney. J. Ribeiro ◽  
Fernando C. Oliveira ◽  
Alex S. Borges ◽  
...  
Keyword(s):  
Excited States ◽  
Formation Mechanism ◽  
Solid Solutions ◽  
Positronium Formation

Evidence of the Participation of Electronic Excited States in the Mechanism of Positronium Formation in Substitutional Tb1-xEux(dpm)3 Solid Solutions Studied by Optical and Positron Annihilation Spectroscopies

2012 ◽  
Vol 733 ◽  
pp. 245-248 ◽  
Author(s):  
Welington F. Magalhães ◽  
Fernando Fulgêncio ◽  
Fernando C. de Oliveira ◽  
Dario Windmöller ◽  
José C. Machado ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Excited States ◽  
Solid Solutions ◽  
Electronic States ◽  
Positronium Formation ◽  
Metal Charge ◽  
Positron Annihilation Lifetime ◽  
Electronic Excited States ◽  
Relevant Role ◽  
Metal Charge Transfer

Positron annihilation lifetime (PALS) and photoluminescence spectroscopies measurements were performed in Tb(III) and Eu(III) dipivaloylmethanates, Tb(dpm)3and Eu(dpm)3, and also on their binary solid solutions of general formula Tb1-xEux(dpm)3. A correlation between the5D4Tb(III) energy level lifetime and the positronium formation probability was observed, indicating that the ligand-to-metal charge transfer LMCT states act in both luminescence quenching and positronium formation inhibition. From these results, a new model is proposed, showing that excited electronic states have a relevant role in the positronium formation mechanism.

Positronium Formation in KCl-KBr Solid Solutions

1972 ◽  
Vol 53 (2) ◽  
pp. K133-K135 ◽  
Author(s):  
A. V. Vorobev ◽  
K. P. Arefev ◽  
S. A. Vorobev
Keyword(s):  
Solid Solutions ◽  
Positronium Formation

Excited states of positronium in positron–hydrogen charge exchange

1978 ◽  
Vol 56 (5) ◽  
pp. 565-570 ◽  
Author(s):  
V. S. Kulhar ◽  
C. S. Shastry
Keyword(s):  
Excited States ◽  
Charge Exchange ◽  
Cross Sections ◽  
Ground State ◽  
Born Approximation ◽  
Energy Region ◽  
Hydrogen Charge ◽  
Positronium Formation ◽  
State Approximation ◽  
Higher Excited States

The two state approximation method for the study of the rearrangement collisions is applied to the process of positronium formation in excited states for positron–hydrogen charge exchange collisions. Differential and integrated cross sections are computed for positronium formation in 2S, 2P, and 3S excited states. The results obtained in the energy region 2 to 10 Ry are compared with positronium formation cross sections in ground state. Total positronium formation cross sections including the contributions of capture into all the higher excited states of positronium are also computed in the first Born approximation and the two state approximation in the energy region considered.

Conductance Mechanism in the Solid Phase

1971 ◽  
Vol 49 (12) ◽  
pp. 2004-2007 ◽  
Author(s):  
Pushti Prakash Rastogi
Keyword(s):  
Formation Mechanism ◽  
Solid Solutions ◽  
Solid Phase ◽  
Energy Of Activation ◽  
Hole Formation ◽  
Arrhenius Plots ◽  
Liquid States ◽  
Solid And Liquid States

From the conductance measurements, the effect of solidification of solvent on the mobility of common ions(e.g., Na+, K+ Cs+, Cl−, Br−, I−), in N-methylacetamide (NMA) solutions has been studied and the energy of activation for the conduction of electrolytes in both solid and liquid states calculated from. Arrhenius plots. The conductance behavior in solid phase (or better in solid solutions) has been indicated to be through the "hole-formation mechanism".

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