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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...
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...
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.
Atomic Emission Spectroscopy: Lab01:29

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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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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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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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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
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Probing actinide electronic structure using fluorescence and multi-photon ionization spectroscopy.

Michael C Heaven1

  • 1Department of Chemistry, Emory University, Atlanta, GA 30322, USA.

Physical Chemistry Chemical Physics : PCCP
|October 19, 2006
PubMed
Summary

Investigating actinide chemistry reveals that 5f orbitals are spectators in bond formation for thorium and uranium oxides. Spectroscopic and theoretical studies validate this finding using a ligand field model.

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Area of Science:

  • Inorganic Chemistry
  • Quantum Chemistry
  • Spectroscopy

Background:

  • The role of 5f orbitals in actinide bonding is a key question in actinide chemistry.
  • Relativistic quantum chemistry calculations require validation through experimental data.

Purpose of the Study:

  • To explore the role of 5f orbitals in actinide bond formation.
  • To validate theoretical methods using experimental data for thorium and uranium oxides.

Main Methods:

  • Electronic and photoelectron spectroscopy of gas-phase actinide molecules.
  • Relativistic quantum chemistry calculations.
  • Semi-empirical ligand field model.

Main Results:

  • Spectroscopic and theoretical studies of thorium and uranium oxides indicate 5f-like states are spectators.
  • Complex electronic state patterns are explained by a semi-empirical ligand field model.

Conclusions:

  • The 5f orbitals do not directly participate in bond formation for the studied actinide oxides.
  • Ligand field theory effectively describes the electronic structures of these compounds.