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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,...

$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

IR Spectroscopy: Molecular Vibration Overview

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...

Infrared (IR) Spectroscopy: Overview

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...

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,...

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Related Experiment Video

Updated: Jul 18, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Small-scale-structure of the interstellar medium probed through diffuse band observations.

Martin A Cordiner¹, Stephen J Fossey, Arfon M Smith

¹School of Chemistry, The University of Nottingham.

Faraday Discussions

|December 29, 2006

Summary

Scientists detected small-scale structures in diffuse interstellar band carriers, offering new insights into interstellar medium composition and dust grain chemistry. This finding advances understanding of the diffuse interstellar medium

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Last Updated: Jul 18, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Published on: July 30, 2020

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

Published on: September 26, 2014

Area of Science:

Astronomy and Astrophysics
Interstellar Medium Physics
Astrochemistry

Background:

Diffuse interstellar bands (DIBs) are spectral features linked to interstellar dust grains.
Understanding DIB carriers is crucial for interstellar cloud chemistry and physics.
Recent studies suggest interstellar clouds are more complex ('clumpy') than previously thought.

Purpose of the Study:

To investigate the spatial distribution of diffuse interstellar band carriers.
To search for small-scale structure in the distribution of DIB carriers.
To contribute to solving the diffuse band problem and understanding interstellar medium structure.

Main Methods:

High signal-to-noise optical observations using UCLES at the Anglo-Australian Telescope.
Analysis of spectral data to map the distribution of DIB carriers.
Comparison with existing models of interstellar cloud structure.

Main Results:

First detection of small-scale structure in the spatial distribution of diffuse interstellar band carriers.
Evidence supporting a 'clumpy' nature of the diffuse interstellar medium.
Correlation of DIB carrier distribution with interstellar reddening.

Conclusions:

The detected small-scale structure provides new observational constraints on DIB carrier properties.
This finding aids in identifying DIB carriers and understanding interstellar dust.
The results enhance our knowledge of the physical state and composition of the diffuse interstellar medium.