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Related Concept Videos

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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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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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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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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Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

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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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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

3.2K
Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...
3.2K
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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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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Updated: Jan 9, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Time-resolved 3D momentum spectroscopy in continuous wave atomic photoionization experiments.

K L Romans1, B P Acharya1, A H N C De Silva1

  • 1Physics Department and LAMOR, Missouri University of Science and Technology, Rolla, Missouri 65409, USA.

The Review of Scientific Instruments
|December 10, 2025
PubMed
Summary

A new pump-probe spectroscopy method tracks atomic population dynamics and photoionization in real-time. This technique uses electron-recoil ion coincidences for nanosecond resolution, advancing atomic physics research.

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Area of Science:

  • Atomic Physics
  • Quantum Dynamics
  • Spectroscopy

Background:

  • Investigating atomic population and photoionization dynamics is crucial for understanding fundamental atomic processes.
  • Existing spectroscopic methods lack simultaneous time-resolved and momentum information for complex atomic systems.

Purpose of the Study:

  • To demonstrate an experimental continuous-wave (cw) pump-probe scheme for studying atomic population and photoionization dynamics.
  • To overcome limitations of conventional spectroscopic techniques in providing event-by-event, time-resolved momentum data.

Main Methods:

  • Utilizing a pump-probe scheme with optically pumped 6Li atoms excited by a femtosecond laser.
  • Employing electron-recoil ion coincidences, momentum conservation, and photoelectron cyclotron motion for analysis.
  • Reconstructing ionization times and time-of-flight of charged fragments with nanosecond resolution.

Main Results:

  • Successfully demonstrated a novel pump-probe scheme for atomic dynamics.
  • Enabled simultaneous determination of 3D photoelectron momentum vectors and population dynamics.
  • Achieved nanosecond resolution for ionization times and fragment time-of-flight.

Conclusions:

  • The developed method provides unprecedented insight into atomic population dynamics.
  • This technique significantly advances time-resolved spectroscopy capabilities.
  • Future applications include exploring coherent atomic dynamics and developing precise atomic manipulation schemes.