Positronium formation studies in solid molecular complexes: Triphenylphosphine oxide-triphenylmethanol
- 作者：F.C. Oliveiraa ; b ; fernando@timoteo.cefetmg.br ; A.M.L. Denadaib ; F.H. Fulgê ; ncioa ; W.F. Magalhã ; esa ; A.F.C. Alcâ ; ntaraa ; D. Windmö ; llera ; J.C. Machadoa
- 关键词：Positronium formation ; Solid molecular complex ; Hydrogen bond
- 刊名：Journal of Molecular Structure
- 出版年：2012
- 期刊代码：62_00222860
- 类别：ch
- 出版时间：13 June, 2012
- 卷：1017
- 期：Complete
- 页码：84-89
- 文件大小：613 K
摘要
Positronium formation in triphenylphosphine oxide (TPPO), triphenylmethanol (TPM), and systems [TPPO(1鈭?/sub>X)鈰匱PMX] has been studied. The low probability of positronium formation in complex [TPPO0.5鈰匱PM0.5] was attributed to strong hydrogen bond and sixfold phenyl embrace interactions. These strong interactions in complex reduce the possibility of the n- and 蟺-electrons to interact with positrons on the spur and consequently, the probability of positronium formation is lower. The 蟿3 parameter and free volume (correlated to 蟿3) were also sensitive to the formation of hydrogen bonds and sixfold phenyl embrace interactions within the complex. For physical mixture the positron annihilation parameters remained unchanged throughout the composition range.