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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...
Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
Resonance in an AC Circuit01:26

Resonance in an AC Circuit

The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

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Related Experiment Video

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Ionization branching ratio control with a resonance attosecond clock.

Luca Argenti1, Eva Lindroth

  • 1Atomic Physics, Fysikum, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden. argenti@physto.se

Physical Review Letters
|September 28, 2010
PubMed
Summary

We demonstrate real-time monitoring and control of autoionizing states in helium using extreme ultraviolet (XUV) pump IR-probe experiments. This method allows precise manipulation of ionization pathways by observing electron bursts and quantum beats.

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Area of Science:

  • Quantum dynamics
  • Atomic physics
  • Ultrafast spectroscopy

Background:

  • Autoionizing states are crucial for understanding atomic electron correlation.
  • Real-time control of atomic processes remains a significant challenge.
  • Helium serves as a fundamental two-electron system for theoretical and experimental studies.

Purpose of the Study:

  • To investigate real-time monitoring of autoionizing states in helium.
  • To explore the control of ionization channel yields using pump-probe spectroscopy.
  • To study the dynamics of doubly excited states near the N=2 threshold.

Main Methods:

  • Simulated extreme ultraviolet (XUV) pump IR-probe experiments.
  • Focus on the N=2 excitation threshold in helium.
  • Analysis of photoelectron angular distributions and ion yields.

Main Results:

  • XUV pulse creates coherent superposition of doubly excited states.
  • Observed electron ejection in bursts from decaying states.
  • Prominent interference fringes in photoelectron angular distributions.
  • Significant out-of-phase quantum beats in ion yields for 2s and 2p channels.

Conclusions:

  • Real-time monitoring of autoionizing state dynamics is feasible.
  • Pump-probe experiments offer control over ionization pathways.
  • Quantum interference effects provide insights into electron correlation and decay mechanisms.