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Subatomic Particles03:37

Subatomic Particles

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Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
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Nucleophilic substitution reactions of alkyl halides can proceed via an SN1 or an SN2 mechanism. While in SN2 reactions, the nucleophile attacks the substrate simultaneously as the leaving group departs, in SN1 reactions, the substrate first dissociates to give the carbocation intermediate. Various factors such as the structure of the substrate, the strength of the nucleophile, and the nature of the solvent promote one mechanism over the other.
With increased substitution on the alkyl halide,...
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Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...
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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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Scaling01:26

Scaling

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In designing and analyzing filters, resonant circuits, or circuit analysis at large, working with standard element values like 1 ohm, 1 henry, or 1 farad can be convenient before scaling these values to more realistic figures. This approach is widely utilized by not employing realistic element values in numerous examples and problems; it simplifies mastering circuit analysis through convenient component values. The complexity of calculations is thereby reduced, with the understanding that...
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Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
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Subatomic-scale resolution with SPM: Co adatom on p(2 × 1)Cu(110):O.

R Turanský1, K Palotás1,2, J Brndiar1

  • 1Center for Comp. Mat. Science, Inst. of Physics, Slovak Acad. of Sciences, 84511 Bratislava, Slovakia.

Nanotechnology
|December 8, 2018
PubMed
Summary
This summary is machine-generated.

Scanning probe microscopy (SPM) can image subatomic magnetic features. Near-contact atomic force microscopy (AFM) resolves orbital asymmetry in cobalt (Co) d shells, crucial for understanding magnetism.

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Area of Science:

  • Surface Science
  • Atomic and Magnetic Force Microscopy
  • Quantum Chemistry

Background:

  • Scanning probe microscopy (SPM) offers subatomic resolution for surface studies.
  • Understanding orbital magnetic features is key to nanoscale magnetism.

Purpose of the Study:

  • To investigate the limits of SPM for imaging orbital magnetic features.
  • To analyze a model system of a cobalt (Co) atom on a p(2×1)Cu(110):O surface.

Main Methods:

  • Scanning tunneling spectroscopy (STS) to determine Co d shell occupation and Hubbard U value in DFT+U modeling.
  • Near-contact atomic force microscopy (AFM) in the small-amplitude regime.

Main Results:

  • STS successfully determined Co d shell occupation and Hubbard U.
  • AFM can image the asymmetry arising from partially filled d shells at close distances.
  • A faint asymmetry in electrostatic force is predicted due to Co's ionic character.

Conclusions:

  • SPM techniques, particularly near-contact AFM, can resolve subatomic orbital magnetic asymmetries.
  • These findings are crucial for advancing nanoscale magnetic imaging and materials science.
  • The study provides a framework for imaging more complex transition metal adsorbates.