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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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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.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
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Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

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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...
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Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

4.0K
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...
4.0K
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

2.2K
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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Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

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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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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Single-Photon Absorber Based on Strongly Interacting Rydberg Atoms.

C Tresp1, C Zimmer1, I Mirgorodskiy1

  • 15. Physikalisches Institut and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.

Physical Review Letters
|December 8, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a free-space single-photon absorber that deterministically absorbs one photon from a pulse. This device utilizes Rydberg blockade to turn an opaque medium transparent after absorbing a single photon, enabling photon subtraction.

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Area of Science:

  • Quantum Optics
  • Atomic Physics
  • Photonics

Background:

  • Controlling single photons is crucial for quantum technologies.
  • Deterministic photon absorption is a key challenge in quantum information processing.

Purpose of the Study:

  • To realize a free-space device capable of deterministically absorbing exactly one photon from an incident pulse.
  • To explore the underlying quantum mechanical principles for single-photon manipulation.

Main Methods:

  • Utilizing Rydberg blockade in an optically thick atomic medium.
  • Converting an absorbed photon into a stationary Rydberg excitation.
  • Employing fast engineered dephasing to decouple the excitation from the light field.

Main Results:

  • Demonstrated deterministic absorption of a single photon from an input pulse.
  • Observed the optical medium transition from opaque to transparent after single-photon absorption.
  • Showcased photon subtraction over a range of input photon numbers.
  • Analyzed changes in pulse shape and temporal photon statistics.

Conclusions:

  • The developed device functions as a single-photon absorber, effectively subtracting one photon.
  • The scheme shows potential for applications in number-resolved photon detection.
  • The technology could be applied to implement quantum gate operations.