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Atomic Absorption Spectroscopy: Lab

Atomic Absorption Spectroscopy: Lab

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 nebulizer...

Atomic Absorption Spectroscopy: Interference

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 Absorption Spectroscopy: Radiation and Light Sources

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...

Atomic Absorption Spectroscopy: Instrumentation

Atomic Absorption Spectroscopy: Instrumentation

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.
The atomizer used in AAS can be either a flame atomizer or an...

Atomic Absorption Spectroscopy: Overview

Atomic Absorption Spectroscopy: Overview

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...

Atomic Emission Spectroscopy: Interference

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,...

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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown

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AFGL atmospheric absorption line parameters compilation: 1980 version.

|March 24, 2010

Summary

This summary is machine-generated.

A new atmospheric absorption line parameters compilation is released, featuring updated data for water vapor, carbon dioxide, ozone, and methane. This enhanced atlas covers over 159,000 transitions, improving atmospheric modeling accuracy.

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Area of Science:

Atmospheric Science
Spectroscopy
Geophysics

Background:

Accurate atmospheric absorption line parameters are crucial for remote sensing and climate modeling.
Previous compilations, like the 1978 edition, required updates to reflect new spectroscopic data and improved understanding of atmospheric composition.

Purpose of the Study:

To release a new, comprehensive version of the AFGL (Air Force Geophysics Laboratory) atmospheric absorption line parameters compilation.
To incorporate significant updates and new data for key atmospheric gases, enhancing the accuracy of spectral line databases.

Main Methods:

Compilation and updating of spectroscopic data from various sources.
Inclusion of updated line positions, strengths, and broadening parameters for targeted molecules.
Expansion of the spectral range and number of transitions covered.

Main Results:

The updated compilation includes major modifications to water vapor bands and carbon dioxide line positions.
Improved ozone parameters in the 5- and 10-micrometer regions and enhanced methane data in the 3.5- and 7.7-micrometer regions are incorporated.
The atlas now contains over 159,000 rotational and vibration-rotation transitions, spanning the spectral range from 0.3 to 17,880 cm(-1).

Conclusions:

The new AFGL compilation provides a significantly improved and expanded dataset for atmospheric spectroscopy.
This resource is vital for enhancing the accuracy of atmospheric radiative transfer models, climate simulations, and remote sensing applications.