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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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.
Spin decoupling is usually achieved by...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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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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Atomic Nuclei: Types of Nuclear Relaxation01:28

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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The Energies of Atomic Orbitals03:21

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In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other.
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Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as...
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Related Experiment Video

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Isolating Attosecond Electron Dynamics in Molecules where Nuclei Move Fast.

Laura Cattaneo1, Luca Pedrelli1, Roger Y Bello2

  • 1Physics Department, Institute of Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland.

Physical Review Letters
|February 25, 2022
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Summary

Attosecond science in molecules is complicated by nuclear motion. Streaking is better than RABITT for measuring electron dynamics because it reduces nuclear motion effects.

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Area of Science:

  • Attosecond science
  • Molecular dynamics
  • Quantum chemistry

Background:

  • Capturing real-time electronic dynamics in molecules is a key goal in attosecond science.
  • Nuclear motion in molecules can influence and distort electron dynamics, complicating measurements.
  • Existing attosecond techniques may yield contradictory results due to nuclear motion effects.

Purpose of the Study:

  • To investigate the impact of nuclear motion on electronic dynamics measurements in molecular hydrogen (H2).
  • To compare the suitability of two prominent attosecond techniques, RABITT and streaking, for studying photoionization dynamics in H2.

Main Methods:

  • Utilized ab initio theoretical calculations alongside experimental attosecond techniques.
  • Employed Reconstruction of Attosecond Beating by Interference of Two-Photon Transitions (RABITT) and attosecond streaking.
  • Investigated the dissociative ionization of H2 in the autoionizing Q1 state region.

Main Results:

  • RABITT measurements were highly sensitive to molecular bond softening, even at low IR intensity, due to long probe pulse duration.
  • Attosecond streaking proved more effective in isolating electron dynamics by using shorter pulses, minimizing nuclear motion interference.
  • Streaking measurements showed excellent agreement with theoretical calculations and offered superior energy resolution.

Conclusions:

  • Attosecond streaking is a more robust technique for studying ultrafast electron dynamics in molecules compared to RABITT, due to its ability to mitigate nuclear motion effects.
  • The findings highlight the importance of considering nuclear motion in attosecond measurements and suggest streaking as a preferred method for complex molecular systems.