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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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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.
The atomizer used in AAS can be either a flame atomizer or an...
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Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

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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...
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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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....
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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 Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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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.
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Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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Single-shot transient absorption spectroscopy techniques and design principles.

Kelly S Wilson1, Zachary S Walbrun1, Cathy Y Wong2

  • 1Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97403, United States.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|February 28, 2021
PubMed
Summary

Single-shot transient absorption (SSTA) spectroscopy measures sample dynamics in one laser shot, unlike traditional transient absorption (TA). This advancement allows the study of unstable systems and irreversible processes.

Keywords:
In situ measurementsInstrumental designSpatial encodingSpectroscopyTime resolvedTransient absorption

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Area of Science:

  • Spectroscopy
  • Physical Chemistry
  • Materials Science

Background:

  • Transient absorption (TA) spectroscopy is a standard technique for studying photoexcited species dynamics.
  • TA typically requires serial measurements at discrete time delays, limiting its application for unstable or rapidly evolving systems.

Purpose of the Study:

  • To review techniques for implementing single-shot transient absorption (SSTA) spectroscopy.
  • To outline design principles for SSTA instruments enabling rapid measurements of dynamic processes.

Main Methods:

  • SSTA encodes pump-probe time delays into the probe beam's spatial profile.
  • This enables simultaneous acquisition of time-resolved data in a single laser shot.

Main Results:

  • SSTA significantly reduces measurement time compared to conventional TA.
  • The technique allows for the characterization of unstable systems and irreversible processes.

Conclusions:

  • SSTA offers a powerful alternative to TA for studying dynamic and transient phenomena.
  • Careful instrument design and calibration are crucial for accurate SSTA measurements.