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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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...
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

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Published on: August 6, 2018

Two-electron time-delay interference in atomic double ionization by attosecond pulses.

A Palacios1, T N Rescigno, C W McCurdy

  • 1Lawrence Berkeley National Laboratory, Chemical Sciences and Ultrafast X-ray Science Laboratory, Berkeley, California 94720, USA.

Physical Review Letters
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

Researchers observed quantum interference in atomic double ionization using ultrashort ultraviolet pulses. This interference arises from indistinguishable electrons ejected sequentially, revealing fundamental quantum mechanics principles.

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Area of Science:

  • Atomic physics
  • Quantum mechanics
  • Ultrafast spectroscopy

Background:

  • Atomic double ionization is a fundamental process in atomic physics.
  • Ultrafast laser pulses enable the study of electron dynamics in atoms.
  • Understanding electron correlation is crucial for quantum chemistry and materials science.

Purpose of the Study:

  • To investigate the possibility of observing quantum interference in a two-color two-photon atomic double ionization experiment.
  • To explore the role of electron indistinguishability and exchange symmetry in this process.

Main Methods:

  • Designing a two-color two-photon atomic double ionization experiment using subfemtosecond ultraviolet pulses.
  • Performing ab initio calculations to simulate the electron dynamics and predict observable phenomena.

Main Results:

  • The sequential two-color process, where each pulse ejects one electron, can dominate the ionization.
  • A prominent interference pattern in the joint energy distribution of the ejected electrons was predicted for sufficiently short pulses.
  • This interference pattern is a direct consequence of electron indistinguishability and the exchange symmetry of the electronic wave function.

Conclusions:

  • Quantum interference is observable in atomic double ionization experiments with tailored ultrashort pulse sequences.
  • The study highlights the importance of electron indistinguishability in quantum phenomena.
  • This work provides insights into electron correlation and wave function symmetry in atomic systems.