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Nuclear Overhauser Enhancement (NOE)01:07

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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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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Newton-X Platform: New Software Developments for Surface Hopping and Nuclear Ensembles.

Mario Barbatti1,2, Mattia Bondanza3, Rachel Crespo-Otero4

  • 1Aix Marseille University, CNRS, ICR, 13013Marseille, France.

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Newton-X is an open-source platform for nonadiabatic molecular dynamics and spectrum simulations. It offers advanced features for photophysical and photochemical research, including machine learning integration.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Photochemistry

Background:

  • Nonadiabatic molecular dynamics and spectrum simulations are crucial for photophysical and photochemical investigations.
  • Surface hopping and nuclear ensemble approaches are common methodologies in this field.

Purpose of the Study:

  • To describe the main features and implementation of the Newton-X computational platform.
  • To highlight recent advancements in Newton-X for advanced chemical simulations.

Main Methods:

  • Utilizes surface hopping and nuclear ensemble approaches for nonadiabatic molecular dynamics.
  • Implements spectrum simulations for photophysical and photochemical studies.
  • Interfaced with third-party quantum chemistry programs for diverse electronic structure calculations.

Main Results:

  • Details the functionalities of Newton-X, an open-source computational platform.
  • Emphasizes new developments like zero-point-energy leakage correction and machine learning potentials.
  • Supports exciton dynamics for multiple chromophores and advanced machine learning techniques.

Conclusions:

  • Newton-X provides a comprehensive and extensible platform for advanced computational chemistry.
  • The software facilitates sophisticated simulations of photophysical and photochemical processes.
  • Its integration capabilities and recent developments enhance its utility for researchers.