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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as...
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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
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Quantum interference in atom-exchange reactions.

Yi-Xiang Liu1,2, Lingbang Zhu1,2, Jeshurun Luke1,2

  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.

Science (New York, N.Y.)
|May 16, 2024
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Summary
This summary is machine-generated.

Researchers explored quantum coherence in chemical reactions using potassium-rubidium (KRb) and rubidium (Rb2) molecules. They found that entanglement in nuclear spins can be preserved and redistributed during reactions, opening new avenues in quantum chemistry.

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Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
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Area of Science:

  • Quantum Chemistry
  • Molecular Physics
  • Chemical Reactions

Background:

  • Chemical reactions are dynamic quantum processes involving bond breaking and formation.
  • A key question is whether quantum coherence can be maintained and utilized to create entangled molecules.

Purpose of the Study:

  • To investigate the preservation and redistribution of quantum coherence in chemical reactions.
  • To explore the potential for harnessing entanglement in nuclear spin degrees of freedom during reactions.

Main Methods:

  • Studied the 2KRb + Rb2 reaction at ultra-low temperatures (500 nanokelvins).
  • Prepared initial nuclear spins in KRb in an entangled state by manipulating magnetic fields.
  • Characterized the preserved coherence in the nuclear spin wave function post-reaction.

Main Results:

  • Observed an interference pattern indicating full coherence at the reaction's conclusion.
  • Demonstrated that entanglement prepared in reactants can be redistributed via atom-exchange.

Conclusions:

  • Quantum coherence can be preserved throughout chemical reactions.
  • Entanglement in nuclear spins is a viable resource that can be manipulated and redistributed in molecular reactions.