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Related Concept Videos

The Bohr Model02:18

The Bohr Model

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 the nucleus...
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The Quantum-Mechanical Model of an Atom

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. Schrödinger...
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Force can be calculated from the expression for potential energy, which is a function of position. The component of a conservative force, in a particular direction, equals the negative of the derivative of the corresponding potential energy with respect to the displacement in that direction. For regions where potential energy changes rapidly with displacement, the work done and force is maximum. Also, when force is applied along the positive coordinate axis, the potential energy decreases with...
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Kinetic Theory of an Ideal Gas

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Related Experiment Video

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A Millimeter Scale Flexural Testing System for Measuring the Mechanical Properties of Marine Sponge Spicules
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Atomic-scale visualization of inertial dynamics.

A M Lindenberg1, J Larsson, K Sokolowski-Tinten

  • 1Stanford Synchrotron Radiation Laboratory/Stanford Linear Accelerator Center (SLAC), Menlo Park, CA 94025, USA.

Science (New York, N.Y.)
|April 16, 2005
PubMed
Summary
This summary is machine-generated.

Researchers directly observed atomic motion during a solid-to-liquid phase transition using femtosecond X-ray pulses. The study reveals inertial dynamics and provides insights into potential energy surfaces, linking nonequilibrium and equilibrium liquid behavior.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Physical chemistry

Background:

  • Atomic motion on potential energy surfaces governs liquid and solid dynamics.
  • Understanding phase transitions is crucial for materials science and chemistry.

Purpose of the Study:

  • To directly observe atomic displacements during a laser-induced solid-to-liquid phase transition.
  • To investigate the dynamics of nonequilibrium phase transitions.
  • To characterize the transition-state potential energy surface.

Main Methods:

  • Utilizing an accelerator-based source for femtosecond X-ray pulses.
  • Tracking atomic displacements on an optically modified energy landscape.
  • Analyzing inertial dynamics and potential energy surface curvature.

Main Results:

  • Direct observation of atomic motion during the transition from crystalline solid to disordered liquid.
  • Demonstration of inertial dynamics as the primary short-time behavior.
  • Constraints placed on the shape and curvature of the transition-state potential energy surface.

Conclusions:

  • The observed dynamics exhibit analogies to the short-time behavior of equilibrium liquids.
  • Provides a new experimental approach to study ultrafast phase transitions.
  • Offers fundamental insights into the nature of matter transitioning between solid and liquid states.