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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Distinct metallization and atomization transitions in dense liquid hydrogen.

Guglielmo Mazzola1, Sandro Sorella1

  • 1International School for Advanced Studies (SISSA), and CRS Democritos, CNR-INFM, -Via Bonomea 265, I-34136 Trieste, Italy.

Physical Review Letters
|March 28, 2015
PubMed
Summary

This study reveals a novel transition in dense liquid hydrogen at ~400 GPa, showing metallic behavior in a partially dissociated molecular fluid. This finding aligns with experimental observations of metallization at finite temperatures.

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Area of Science:

  • Condensed matter physics
  • Computational materials science

Background:

  • Understanding the phase diagram of hydrogen under extreme pressure is crucial for planetary science and materials science.
  • Previous studies reported a complete atomization transition in liquid hydrogen at inaccessible pressures.

Purpose of the Study:

  • To investigate the phase transitions and metallization of dense liquid hydrogen using advanced simulation techniques.
  • To identify new transitions at more accessible pressure ranges.

Main Methods:

  • Performing large-scale molecular dynamics simulations.
  • Utilizing accurate quantum Monte Carlo forces for high-fidelity simulations.
  • Analyzing the behavior of liquid hydrogen at pressures around 400 GPa.

Main Results:

  • Identified a transition between fully molecular and mixed molecular-atomic liquid hydrogen at ~400 GPa.
  • Provided numerical evidence for the metallic behavior of this intermediate phase.
  • Observed that the first-order transition becomes a crossover at high temperatures, matching experimental data.

Conclusions:

  • Metallization at finite temperature in liquid hydrogen occurs in the partially dissociated molecular fluid, preceding complete atomization.
  • The identified transition and its characteristics offer new insights into the behavior of hydrogen under extreme conditions.