Abstract:A first-principles electronic structure study is performed to determine the optical and static polarizability tensors of various phthalocyanine ͑Pc͒ derived molecules, including H 2 Pc, CuPc, and MgPc. It is found that the dominant contribution to the polarizability is electronic in origin, and that the metal atoms only marginally enhance the polarizability. An analytical electrostatic model that relates the polarizability of an ellipsoid to its permittivity is then used to estimate the permittivity tensor of … Show more
“…Both density shape parameters have been computed using the software package GAUS-SIAN (LC-BLYP/cc-pVTZ) [26]. They represent the geometry of the molecule and can be used to compute the polarizability ellipsoid [24]. The coefficients c i are analytically known.…”
In recent years, matter-wave diffraction at nanomechanical structures has been used by several research groups to explore the quantum nature of atoms and molecules, to prove the existence of weakly bound molecules or to explore atom-surface interactions with high sensitivity. The particles' Casimir-Polder interaction with the diffraction grating leads to significant changes in the amplitude distribution of the diffraction pattern. This becomes particularly intriguing in the thin-grating limit, i.e. when the size of a complex molecule becomes comparable with the grating thickness and its rotation period comparable to the transit time through the mask. Here we analyze the predictive power of a Green's function scattering model and the constraints imposed by the finite control over real-world experimental factors on the nanoscale.
“…Both density shape parameters have been computed using the software package GAUS-SIAN (LC-BLYP/cc-pVTZ) [26]. They represent the geometry of the molecule and can be used to compute the polarizability ellipsoid [24]. The coefficients c i are analytically known.…”
In recent years, matter-wave diffraction at nanomechanical structures has been used by several research groups to explore the quantum nature of atoms and molecules, to prove the existence of weakly bound molecules or to explore atom-surface interactions with high sensitivity. The particles' Casimir-Polder interaction with the diffraction grating leads to significant changes in the amplitude distribution of the diffraction pattern. This becomes particularly intriguing in the thin-grating limit, i.e. when the size of a complex molecule becomes comparable with the grating thickness and its rotation period comparable to the transit time through the mask. Here we analyze the predictive power of a Green's function scattering model and the constraints imposed by the finite control over real-world experimental factors on the nanoscale.
“…where ν is an attempt frequency in the order of Xe vibration frequencies (2·10 in-plane polarizability of Cu-Pc is more than a factor of 30 greater than that of Xe [24], and thus rationalizes the room temperature trapping of large, polarizable molecules.…”
The trapping of single molecules on surfaces without the formation of strong covalent bonds is a prerequisite for molecular recognition and the exploitation of molecular function. On nanopatterned surfaces, molecules may be selectively trapped and addressed. In a boron nitride nanomesh formed on Rh(111), the pattern consisted of holes 2 nanometers in diameter on a hexagonal superlattice, separated by about 3 nanometers. The trapping was further investigated with density functional theory and the photoemission of adsorbed xenon, where the holes were identified as regions of low work function. The analysis showed that the trapping potential was localized at the rims of the holes.
“…[7,9,12,16] Эти исследования проведены с исполь-зованием различных вариантов метода DFT с валентно двух-(VDZP, 6-31G(d)) и трехэкспонентными (VTZP) ба-зисами, дополненными поляризационными функциями. …”
Section: геометрическое строениеunclassified
“…В работе [9] представлены результаты расчета свойств молекул MgP, MgPz и MgPc в приближении PBE0/VTZP. Отличие приведенных в работе [9] величин межъядерных расстояний от наших данных не превышает 0.006 Å. Отклонение геометриче-ских параметров комплекса MgPc, полученных методом LDA/VDZP [7] с использованием остовных потенциалов на атомах Mg, N и C, от результатов настоящей работы не превышает 0.015 Å и 1.1º для длин связей и валентных углов, соответственно.…”
Section: геометрическое строениеunclassified
“…[5,6] Величины геометрических параметров, электронные и колебательные спектры MgPc были получены с использованием теории функционала электронной плотности (DFT) авторами ряда работ. [7][8][9][10][11][12] Электронные спектры порфирина магния (MgP) были изучены в работах. [13,14] В теоретических исследованиях методом DFT [9,11,15,16] были получены значения геометрических параметров, колебательные и электронные спектры комплекса MgP.…”
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