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Related Concept Videos

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,...
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,...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
The de Broglie Wavelength02:32

The de Broglie Wavelength

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...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

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Attosecond electron wave-packet interference observed by transient absorption.

M Holler1, F Schapper, L Gallmann

  • 1Physics Department, ETH Zurich, 8093 Zürich, Switzerland.

Physical Review Letters
|April 27, 2011
PubMed
Summary
This summary is machine-generated.

Attosecond spectroscopy reveals rapid absorption oscillations in helium. These modulations indicate interference between transiently bound electronic wave packets, explaining the observed absorption changes.

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Last Updated: Jun 2, 2026

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Area of Science:

  • Quantum mechanics
  • Atomic physics
  • Ultrafast spectroscopy

Background:

  • Understanding electron dynamics is crucial in atomic physics.
  • Attosecond transient absorption spectroscopy probes ultrafast electronic processes.

Purpose of the Study:

  • Investigate electron wave packet dynamics in helium.
  • Determine the mechanism behind absorption modulation in attosecond spectroscopy.

Main Methods:

  • Attosecond time-resolved transient absorption spectroscopy.
  • Utilized superimposed infrared laser fields.
  • Measured absorption changes around the first ionization threshold of helium.

Main Results:

  • Observed rapid oscillations in the absorption of individual harmonics.
  • Analyzed the time-delay dependent absorption modulation.
  • Determined the phase relation between absorption modulations of different harmonics.

Conclusions:

  • The observed absorption modulation is driven by the interference of transiently bound electronic wave packets.
  • Provides direct evidence for wave packet interference as the underlying mechanism.