2002
DOI: 10.1002/qua.10214
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Quantum mechanics of solvated complexes: A test for positronium

Abstract: ABSTRACT:A hybrid quantum mechanics/molecular mechanics approach is developed for calculating properties of solvated complexes. The method is based on self-consistent calculations of the Kohn-Sham equations for electronic wave functions and integral equations for solvent structure. The method is applied to solvated positronium (Ps). Using a simple parameterization for the Ps wave function, we calculate the local solvent structure around a hydrated Ps. The results are consistent with the experimental data.

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Cited by 5 publications
(10 citation statements)
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“…252 A hybrid scheme for the calculation of hydrated positronium including self-consistent DFT computations of the distribution of the Ps density and the calculation of water microstructure by the method of integral equations has been developed. 253 The obtained results are consistent with experimental data. Figure 13 shows the Ps7H and Ps7O atom ± atom correlation functions calculated for normal conditions.…”
Section: Solvated Quantum Particlessupporting
confidence: 89%
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“…252 A hybrid scheme for the calculation of hydrated positronium including self-consistent DFT computations of the distribution of the Ps density and the calculation of water microstructure by the method of integral equations has been developed. 253 The obtained results are consistent with experimental data. Figure 13 shows the Ps7H and Ps7O atom ± atom correlation functions calculated for normal conditions.…”
Section: Solvated Quantum Particlessupporting
confidence: 89%
“…The form of these functions is typical of neutral solutes; however, in the case of positronium, they are smoother than in the case of neutral atoms. The procedure similar to that described in the study cited 253 is fairly versatile and can be used for solving a broad range of problems related to the study of solvated positronium.…”
Section: Solvated Quantum Particlesmentioning
confidence: 99%
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“…Podemos concluir que a solvatação do Ps emágua altera significativamente a estrutura do líquido, de modo que o Ps possa ocupar uma cavidade relativamente grande no interior do líquido. Por outro lado, a estrutura do Ps hidratado obtida apresenta um comportamento distante daquele reportado no chamado modelo bolha (bubble model) no qual o Ps habita uma cavidade com raio entre 3.2Å e 3.55Å naágua[21]. Essa diferença pode ser atribuída ao fato desses modelos tratarem de forma bastante idealizada e simples a interação do Ps com aágua.…”
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“…Os orbitais SOMO eletrônico e positrônico do Ps obtidos nestes cálculos são semelhantes a orbitais do tipo s e estão representados na figura(5.14).O modelo bolha do Ps solvatado considera oátomo de positrônio como uma partícula quântica pontual sujeita a um poço de potencial finito, e a profundidade dessa barreira de potencial subtraída da energia do Ps pode ser comparada aos VDEs determinados em nosso estudo. As diferentes versões do modelo bolha propostas na literatura consideram poços de potencial nos quais essa diferençaé de 2.91 eV e 1.88 eV[21], e portanto estão distantes dos nossos resultados dos VDEs eletrônico e positrônico.Figura 5.14: Orbitais SOMO eletrônico em laranja e positrônico em roxo obtidos em um dos 60 cálculos quânticos realizados, a figura da direita mostra ambos os orbitais representados simultaneamente. Utilizamos o isovalor 0.03.…”
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