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Related Concept Videos

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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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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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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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: Interference01:25

Atomic Absorption Spectroscopy: Interference

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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.
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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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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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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Absolute Quantum Yield Measurement of Powder Samples
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Demonstrating an absolute quantum advantage in direct absorption measurement.

Paul-Antoine Moreau1,2, Javier Sabines-Chesterking3, Rebecca Whittaker3

  • 1Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol, BS8 1FD, UK. paul-antoine.moreau@glasgow.ac.uk.

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Quantum technology offers an absolute advantage in optical absorption measurements. This quantum probe surpasses ideal classical methods, reducing photon usage by 32% for improved precision.

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Area of Science:

  • Quantum Engineering
  • Quantum Optics
  • Metrology

Background:

  • Quantum theory enables engineering applications with potential advantages over classical technologies.
  • Quantum technologies may surpass even future classical advancements.
  • Optical absorption measurements are crucial in various scientific and industrial fields.

Purpose of the Study:

  • To experimentally demonstrate an absolute quantum advantage for optical direct absorption measurements per photon probe.
  • To show that quantum probes can outperform ideal classical probes, regardless of classical technology improvements.

Main Methods:

  • Utilized correlated intensity measurements from spontaneous parametric down-conversion (SPDC).
  • Employed a commercially available air-cooled CCD for detection.
  • Developed a novel estimator for data analysis with a high-efficiency photon-pair source.

Main Results:

  • Achieved measurement precision exceeding that of an ideal coherent state (perfect laser) with perfect detection.
  • Demonstrated absolute improvement for absorption levels up to 50%.
  • Observed a maximum improvement factor of 1.46, equivalent to a 32% reduction in photon traversal for optical samples.

Conclusions:

  • This work presents the first experimental demonstration of an absolute quantum advantage in optical absorption measurements.
  • The developed quantum probe offers superior precision compared to any classical light-based measurement.
  • This advancement has implications for reducing photon consumption in optical sensing and metrology.