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Atomic Emission Spectroscopy: Overview

Atomic Emission Spectroscopy: Overview

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...

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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 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: Instrumentation

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 Fluorescence Spectroscopy

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 Absorption Spectroscopy: Atomization Methods

Atomic Absorption Spectroscopy: Atomization Methods

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 aerosol...

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Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Australian aerosol backscatter survey.

J L Gras, W D Jones

|June 16, 2010

Summary

This summary is machine-generated.

Atmospheric backscatter coefficient measurements in Australia during 1986 showed good agreement between CO(2) lidar and aerosol calculations. Free troposphere values were lower than those typically found in the Northern Hemisphere.

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Area of Science:

Atmospheric Science
Remote Sensing
Aerosol Science

Background:

Accurate measurement of atmospheric backscatter is crucial for understanding atmospheric properties and climate.
Previous measurements of atmospheric backscatter in the Southern Hemisphere, particularly Australia, are limited.

Purpose of the Study:

To measure the atmospheric backscatter coefficient in and around Australia.
To compare measurements obtained from different techniques.
To provide baseline data for future atmospheric studies in the region.

Main Methods:

Measurements using a carbon dioxide (CO(2)) lidar operating at 10.6 micrometers.
Calculations of backscatter coefficients derived from measured aerosol parameters.

Main Results:

Good agreement was observed between lidar measurements and aerosol calculations.
Atmospheric backscatter coefficients ranged from approximately 1 x 10(-8)m(-1)sr(-1) near the surface to 4-5 x 10(-11)m(-1)sr(-1) at 5-7 km altitude.
Free troposphere backscatter values in Australia were found to be lower than typical Northern Hemisphere values.

Conclusions:

The study successfully validated two distinct methods for measuring atmospheric backscatter.
The findings provide valuable data on atmospheric conditions in the Australian region.
The lower free tropospheric backscatter suggests potential regional differences in aerosol loading or composition.