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Related Concept Videos

Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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Atomic Absorption Spectroscopy: Interference01:25

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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,...
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Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

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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.
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Development of Analytical Methods01:21

Development of Analytical Methods

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An analytical methodology can be divided into four sequential steps: technique, method, procedure, and protocol. A technique is a scientific principle that rationalizes a specific phenomenon through chemical measurements. Adapting a technique for analyzing a sample of interest is termed a method. The procedure outlines the directions for performing the analysis via an analytical method. The protocol is the detailed guidelines on the procedure, which should be strictly followed to obtain the...
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Atomic Absorption Spectroscopy: Lab01:21

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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Dialogue on analytical and ab initio methods in attoscience.

Gregory S J Armstrong1, Margarita A Khokhlova2,3, Marie Labeye4

  • 1Centre for Theoretical Atomic, Molecular, and Optical Physics, Queen's University Belfast, Belfast, BT7 1NN UK.

The European Physical Journal. D, Atomic, Molecular, and Optical Physics
|November 1, 2021
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Summary
This summary is machine-generated.

This review clarifies the relationship between analytical and ab initio methods in attosecond science, dispelling misconceptions about theoretical approaches. It highlights how numerical and analytical techniques complement each other for scientific discovery.

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Area of Science:

  • * Attosecond science and theoretical physics.
  • * Quantum dynamics and computational methods.

Background:

  • * A perceived tension exists between analytical and ab initio (from first principles) theoretical approaches in attosecond science.
  • * Misconceptions often arise regarding the interplay and distinctions between these methods.

Purpose of the Study:

  • * To explore and resolve the tension between analytical and ab initio theoretical methods in attosecond science.
  • * To clarify the roles and relationships of various theoretical tools used in the field.

Main Methods:

  • * Compilation of discussions from a round-table panel at the 'Quantum Battles in Attoscience' workshop.
  • * Survey of analytical and numerical theoretical tools in attosecond science.
  • * Case studies of non-sequential double ionization and resonant high-harmonic generation.

Main Results:

  • * Identified and addressed common misconceptions about ab initio versus numerical methods.
  • * Evaluated the advantages and disadvantages of analytical, numerical, and ab initio approaches.
  • * Demonstrated the complementary roles of different methods in understanding attosecond processes.

Conclusions:

  • * The dichotomy between analytical and ab initio methods is often artificial; they are complementary tools.
  • * Understanding the strengths of each method enhances scientific discovery in attosecond science.
  • * Dialogue and clear definitions are crucial for advancing theoretical attosecond science.