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Related Concept Videos

Shock Waves01:16

Shock Waves

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While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
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Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

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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...
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Atomic Absorption Spectroscopy: Instrumentation01:22

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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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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.
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Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

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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: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

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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.
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Time-Resolved Broadband Cavity-Enhanced Absorption Spectroscopy behind Shock Waves.

Akira Matsugi1, Hiroumi Shiina1, Tatsuo Oguchi2

  • 1National Institute of Advanced Industrial Science and Technology (AIST) , 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan.

The Journal of Physical Chemistry. A
|March 19, 2016
PubMed
Summary

A new broadband cavity-enhanced absorption spectroscopy (BBCEAS) method in a shock tube enables fast, sensitive high-temperature chemical kinetics and spectroscopy. This technique accurately measures formaldehyde

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Area of Science:

  • Chemical Kinetics
  • Spectroscopy
  • Physical Chemistry

Background:

  • High-temperature chemical kinetics and spectroscopy require sensitive, fast measurement techniques.
  • Existing methods may lack the necessary temporal and spectral resolution for complex reactions.

Purpose of the Study:

  • To develop and validate a fast and sensitive broadband absorption technique for high-temperature chemical kinetics and spectroscopy.
  • To apply broadband cavity-enhanced absorption spectroscopy (BBCEAS) within a shock tube environment.

Main Methods:

  • Utilized broadband cavity-enhanced absorption spectroscopy (BBCEAS) in a shock tube.
  • Achieved effective absorption path lengths of 60-200 cm with cavity enhancement factors of 12-40.
  • Recorded absorption time profiles over a 280-420 nm wavelength range with 5 μs temporal and 2 nm spectral resolution.

Main Results:

  • Investigated high-temperature reactions and formaldehyde absorption spectra using 1,3,5-trioxane as a precursor.
  • Obtained accurate rate constants for 1,3,5-trioxane and formaldehyde decomposition reactions, consistent with literature.
  • Determined high-temperature formaldehyde absorption cross sections at temperatures up to 1708 K.

Conclusions:

  • The developed BBCEAS technique is highly applicable for sensitive, time- and wavelength-resolved absorption measurements at high temperatures.
  • This method provides a valuable tool for studying combustion chemistry and high-temperature reaction dynamics.