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Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Stereoisomers02:32

Stereoisomers

14.0K
On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to...
14.0K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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Phase Contrast and Differential Interference Contrast Microscopy01:26

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
9.4K
Poisson's Ratio01:23

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Poisson's ratio is a material property that indicates their stress response. It explains the connection between the elongation or compression a material undergoes in the direction of an applied force and the contraction or expansion it experiences perpendicular to that force. When a slender bar is loaded axially, it stretches in the direction of the force and contracts laterally. Poisson's ratio is the negative ratio of this lateral contraction to the axial elongation. The negative sign...
2.3K
Fineness Modulus01:19

Fineness Modulus

2.0K
The fineness modulus (FM) of aggregate is a numerical index that measures the coarseness or fineness of the particles. It is calculated by adding the cumulative percentages of aggregate retained on each of a specified series of sieves and dividing the sum by 100.
Consider performing sieve analysis on sand through a set of ASTM sieves. The weight of aggregate retained in each sieve and pan placed at the bottom is recorded, as given in Column B of Table 1.
To determine the fineness modulus of...
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Imágenes de la anisotropía de la función de onda del receptor en silicio

Manuel Siegl1,2, Julian Zanon3, Joseph Sink4

  • 1London Centre for Nanotechnology, University College London, London WC1H 0AH, U.K.

Nano letters
|August 21, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores capturaron las primeras imágenes de microscopía de túnel de exploración de las funciones de onda del aceptor hidrógeno en silicio. Estas imágenes revelan características de anillo cuadrado, cruciales para el desarrollo de dispositivos cuánticos basados en silicio.

Palabras clave:
Estados aceptadoresteoría de la masa efectivaingeniería de dispositivos cuánticosMicroscopía de túnel de exploraciónel silicioFunciones de Greens de unión estrecha

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Área de la Ciencia:

  • Física de la materia condensada
  • Ciencias de los materiales
  • La computación cuántica

Sus antecedentes:

  • La comprensión de los estados de aceptor en el silicio es crucial para la fabricación de dispositivos semiconductores.
  • Las técnicas de imagen previa no han resuelto las características espaciales de estas funciones de onda.
  • Los defectos pueden alterar significativamente las propiedades electrónicas del silicio.

Objetivo del estudio:

  • Obtener las primeras imágenes directas de las funciones de onda del aceptor hidrogénico en silicio utilizando microscopía de túnel de barrido (STM).
  • Caracterizar la distribución espacial y la simetría de estos estados aceptores.
  • Para proporcionar una base para el diseño de dispositivos cuánticos avanzados basados en silicio.

Principales métodos:

  • Implantación de bismuto de alta energía para crear defectos cercanos a la superficie en una oblea de silicio (001).
  • Microscopía de túnel de barrido (STM) para imágenes a escala atómica.
  • Espectroscopia de túnel de barrido (STS) para confirmar las propiedades electrónicas de la superficie.
  • Cálculos teóricos de la masa efectiva y de la sujeción para el análisis.

Principales resultados:

  • Se obtuvieron con éxito las primeras imágenes STM de las funciones de onda del aceptor hidrogénico en silicio.
  • Los estados de aceptación observados se presentan como características distintas de anillo cuadrado.
  • STS confirmó la formación de una capa superficial de tipo p.
  • Los cálculos teóricos reproducen con precisión las características de anillo cuadrado observadas y confirman su carácter aceptor.

Conclusiones:

  • Las características de anillo cuadrado observadas se atribuyen a la degeneración de la banda de agujero ligero y pesado en el silicio.
  • El estudio proporciona información crítica sobre las propiedades espaciales y energéticas de las funciones de onda del aceptador.
  • Este trabajo es esencial para la futura ingeniería de dispositivos cuánticos basados en aceptores a gran escala en silicio.