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Related Concept Videos

Atomic Emission Spectroscopy: Overview01:20

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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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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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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Atomic Emission Spectroscopy: Instrumentation01:22

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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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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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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,...
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Attosecond coherent electron motion in Auger-Meitner decay.

Siqi Li1,2, Taran Driver1,3,4, Philipp Rosenberger1,3,5,6

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Researchers tracked ultrafast electron motion in nitric oxide using attosecond X-ray pulses. They demonstrated control over electron dynamics, opening new avenues for studying quantum systems.

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Last Updated: Oct 7, 2025

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Area of Science:

  • Quantum dynamics
  • Ultrafast spectroscopy
  • Atomic and molecular physics

Background:

  • Coherent superpositions of electronic states in quantum systems evolve on ultrafast timescales, leading to time-dependent charge density.
  • Understanding and controlling electron dynamics is crucial for advancing quantum technologies and fundamental physics.

Purpose of the Study:

  • To track the evolution of coherent core-hole excitation in nitric oxide using time-resolved measurements.
  • To demonstrate control over coherent electron motion by tuning X-ray photon energy.
  • To utilize core-excited states as a test bed for studying electron dynamics in complex matter.

Main Methods:

  • Time-resolved measurements utilizing attosecond soft X-ray pulses from a free-electron laser.
  • Employing a circularly polarized infrared laser pulse as a "clock" to time-resolve electron dynamics.
  • Investigating coherent core-hole excitation in nitric oxide.

Main Results:

  • Successfully tracked the ultrafast evolution of a coherent core-hole excitation in nitric oxide.
  • Demonstrated precise control over coherent electron motion by adjusting the X-ray pulse photon energy.
  • Established a method for time-resolving electron dynamics with attosecond precision.

Conclusions:

  • Core-excited states provide a fundamental platform for investigating coherent electron dynamics in highly excited and strongly correlated systems.
  • Attosecond soft X-ray spectroscopy coupled with laser-based timing offers powerful capabilities for probing and controlling quantum phenomena.
  • This study advances the understanding of electron behavior in quantum systems on their intrinsic timescales.