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Related Concept Videos

Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Sequential double excitations from linear-response time-dependent density functional theory.

Martín A Mosquera1, Lin X Chen1, Mark A Ratner1

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Rd., Evanston, Illinois 60208, USA.

The Journal of Chemical Physics
|June 3, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a new computational method to analyze excited-state spectroscopy. The approach successfully models X-ray and UV/vis absorption in complex molecules, advancing excited-state chemical research.

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Area of Science:

  • Computational Chemistry
  • Spectroscopy
  • Quantum Mechanics

Background:

  • Traditional spectroscopy methods primarily study electronic ground states.
  • Probing transitions from excited states is crucial for understanding many experimental phenomena.
  • Existing methods have limitations in accurately modeling excited-state properties.

Purpose of the Study:

  • To develop a theoretical formalism for investigating excited-state spectroscopic properties.
  • To apply the developed model to specific chemical systems.
  • To advance the understanding of excited-state dynamics and transitions.

Main Methods:

  • Linear-response time-dependent density functional theory (LR-TDDFT) was employed.
  • A novel formalism was developed to extend LR-TDDFT to excited states.
  • The model was applied to a diplatinum(II) complex, pyrene, and azobenzene.

Main Results:

  • The developed formalism successfully calculates excited-state absorption spectra.
  • The method was validated by studying X-ray excited-state absorption of a diplatinum(II) complex.
  • Transient visible/UV absorption spectra of pyrene and azobenzene were accurately reproduced.

Conclusions:

  • The new theoretical framework enables accurate prediction of excited-state spectroscopic properties.
  • This formalism provides a powerful tool for studying complex photochemical processes.
  • The findings open new avenues for computational spectroscopy of excited states.