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Related Concept Videos

UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Free-energy diagrams, or reaction coordinate diagrams, are graphs showing the energy changes that occur during a chemical reaction. The reaction coordinate represented on the horizontal axis shows how far the reaction has progressed structurally. Positions along the x-axis close to the reactants have structures resembling the reactants, while positions close to the products resemble the products.  Peaks on the energy diagram represent stable structures with measurable lifetimes, while...
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Exploring Excited-State Electronic Structure, Spectroscopy, and Nonadiabatic Dynamics with CP2K's Multifaceted

Kota Hanasaki1, Tjeerd Futaii de Jong1, Konstantin Komarov1

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Summary
This summary is machine-generated.

CP2K offers advanced computational methods for studying molecular excited states and spectroscopy. This review highlights its capabilities in time-dependent density functional theory and nonadiabatic dynamics for diverse chemical systems.

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Area of Science:

  • Computational Chemistry
  • Quantum Mechanics
  • Spectroscopy

Background:

  • Accurate simulation of excited states and spectroscopic properties is crucial for understanding molecular behavior.
  • Density functional theory (DFT) based methods are widely used but require extensions for excited-state investigations.

Purpose of the Study:

  • To review recent developments and applications of excited-state and spectroscopic methods within the CP2K software package.
  • To showcase the versatility of CP2K for studying molecular and periodic systems.

Main Methods:

  • Linear-response time-dependent density functional theory (TD-DFT) and density functional perturbation theory (DFPT).
  • Delta self-consistent field (ΔSCF) and real-time TDDFT (RT-TDDFT) methods.
  • Nonadiabatic molecular dynamics (NAMD) integrated with ΔSCF and TD-DFPT, and Ehrenfest dynamics with RT-TDDFT.

Main Results:

  • CP2K implements complementary approaches for excited-state calculations, including TD-DFPT, ΔSCF, and RT-TDDFT.
  • Integration of NAMD and Ehrenfest dynamics enables the study of photochemical processes and excited-state dynamics.
  • Applications cover solvated molecules, photosensitizers, and 2D materials, demonstrating broad applicability.

Conclusions:

  • CP2K provides a powerful and versatile toolkit for investigating excited-state phenomena in both molecular and extended systems.
  • The software facilitates detailed studies of spectroscopic properties such as UV-Vis absorption, ECD, Raman, IR, and VCD spectra.