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Related Concept Videos

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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Interference and Diffraction02:18

Interference and Diffraction

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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.
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Atomic Emission Spectroscopy: Interference01:30

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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,...
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Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences01:20

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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Channel interference in multiphoton absorption.

Md Mehboob Alam1, Maarten T P Beerepoot1, Kenneth Ruud1

  • 1Centre for Theoretical and Computational Chemistry, Department of Chemistry, UiT-The Arctic University of Norway, N-9037 Tromsø, Norway.

The Journal of Chemical Physics
|July 3, 2017
PubMed
Summary
This summary is machine-generated.

We developed a new theory for channel interference in higher-order multiphoton absorption. This work provides a general method to maximize multiphoton absorption strengths in molecules.

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Area of Science:

  • Quantum Chemistry
  • Nonlinear Optics
  • Spectroscopy

Background:

  • Channel interference is a key phenomenon in multiphoton absorption, influencing molecular response.
  • Existing theories primarily focus on lower-order processes, limiting understanding of complex interactions.

Purpose of the Study:

  • To extend the theory of channel interference to higher-order multiphoton absorption processes.
  • To provide a general scheme for deriving interference expressions for any order of multiphoton absorption.
  • To analyze models for maximizing multiphoton absorption strengths in centrosymmetric molecules.

Main Methods:

  • Derivation of an explicit expression for channel interference in three-photon absorption.
  • Development of a general scheme applicable to any order of multiphoton absorption.
  • Analysis of simplest few-state models for multiphoton absorption in centrosymmetric systems.

Main Results:

  • An explicit expression for channel interference in three-photon absorption was derived.
  • A general scheme for higher-order multiphoton absorption interference was proposed.
  • Criteria for maximizing multiphoton absorption strengths were discussed.

Conclusions:

  • The extended theory provides a framework for understanding channel interference in higher-order multiphoton absorption.
  • The proposed general scheme facilitates the analysis of complex multiphoton processes.
  • This research offers insights into optimizing molecular properties for enhanced light-matter interactions.