Positron annihilation studies in solid substituted aromatic compounds

被引：6

作者：

Oliveira, F. C. ^{[1
,2
]}

Oliveira, A. M.

Donnici, C. L. ^{[1
]}

Machado, J. C. ^{[1
]}

Magalhaes, W. F. ^{[1
]}

Windmoeller, D. ^{[1
]}

Fulgencio, F. H. ^{[1
]}

Souza, L. R. ^{[1
]}

机构：

[1] Univ Fed Minas Gerais, ICEx, LEAP, Dept Quim, Belo Horizonte, MG, Brazil

[2] CEFET MG, Ctr Fed Educ Tecnol Minas Gerais, Timoteo, MG, Brazil

来源：

CHEMICAL PHYSICS LETTERS | 2011年 / 506卷 / 1-3期

关键词：

LIFETIME SPECTRA; CONSTANTS; INHIBITION; PARAMETERS; COMPLEXES; MECHANISM; PROGRAM; STATES;

D O I：

10.1016/j.cplett.2011.02.057

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Positronium formation was investigated in benzene and naphthalene compounds with electron donating (-NH2 and -OH) and electron withdrawing (-CN and -NO2) substituents. The results exhibit an increase in the positronium formation yield whenever donating groups are bound to the ring and a decrease with withdrawing groups. These results can be attributed to the pi-system electronic density variation in the aromatic ring. The amount of positronium obtained, I-3 parameter, has been correlated with the Hammett (sigma) and Brown-Okamoto (sigma(+)(p)) constants and adjusted through the modified Hammett equation, which employs the ratio I-3/I-3(phi), yielding a satisfactory fit. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：37 / 41

页数：5

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