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Related Concept Videos

Van der Waals Interactions01:24

Van der Waals Interactions

72.6K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
72.6K
Van der Waals Equation01:10

Van der Waals Equation

6.6K
The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the volume...
6.6K
Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation04:01

Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation

39.6K
Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
39.6K
The Van der Waals Equation01:26

The Van der Waals Equation

19
The ideal gas law is based on two simplifying assumptions: first, that there are no intermolecular attractions between gas molecules, and second, that the volume occupied by the molecules themselves is negligible compared with the volume of the container. However, these assumptions don't hold up under all conditions - specifically, at high pressures and low temperatures, as gas tends to deviate from ideal gas behavior.The van der Waals equation is an enhanced version of the ideal gas law,...
19
Intermolecular Forces03:13

Intermolecular Forces

74.2K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
74.2K
Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

40.4K
The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
40.4K

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Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
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Cold Anisotropically Interacting van der Waals Molecule: TiHe.

Nancy Quiros1, Naima Tariq1, Timur V Tscherbul1

  • 1Department of Physics, University of Nevada, Reno, Nevada 89557, USA.

Physical Review Letters
|June 10, 2017
PubMed
Summary
This summary is machine-generated.

Researchers created titanium-helium van der Waals molecules at low temperatures using laser ablation and helium cooling. These findings advance the study of van der Waals clusters and low-temperature chemistry.

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Area of Science:

  • Physical Chemistry
  • Atomic and Molecular Physics
  • Low-Temperature Physics

Background:

  • Van der Waals molecules are crucial for understanding intermolecular forces.
  • Low-temperature environments are ideal for studying delicate molecular interactions.
  • Titanium-helium interactions are not well-characterized at cryogenic temperatures.

Purpose of the Study:

  • To synthesize and characterize titanium-helium (Ti-He) van der Waals molecules.
  • To determine the binding energies of ground-state Ti-He molecules.
  • To compare experimental results with theoretical calculations for Ti-He interaction potentials.

Main Methods:

  • Laser ablation was used to generate titanium atoms.
  • Helium buffer-gas cooling produced Ti-He van der Waals molecules at cryogenic temperatures.
  • Laser-induced fluorescence spectroscopy detected the molecules and their properties.

Main Results:

  • Successfully produced and detected Ti-He van der Waals molecules.
  • Determined ground-state Ti(a^{3}F_{2})-He binding energies for the ground and first rotationally excited states.
  • Experimental binding energies showed good agreement with newly calculated ab initio Ti-He interaction potentials.

Conclusions:

  • The study successfully created and characterized Ti-He van der Waals molecules.
  • The results validate theoretical calculations of Ti-He interaction potentials.
  • This work opens new avenues for exploring the formation, dynamics, and chemistry of van der Waals clusters at low temperatures.