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Related Concept Videos

Emission Spectra02:39

Emission Spectra

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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

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The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
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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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Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
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Updated: May 1, 2026

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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[Wavelength shift of atomic spectral lines].

Ke-ling Liu1

  • 1Institute of Process Engineering (Institute of Chemical Metallurgy), Chinese Academy of Sciences, Beijing 100080, China.

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|September 5, 2003
PubMed
Summary

This study details how atomic spectral line shifts correlate with environmental factors like temperature and humidity, leading to new calibration equations. An intelligent wavelength calibration device (IWC) was developed and validated for practical applications.

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Area of Science:

  • Atomic spectroscopy
  • Physical chemistry
  • Environmental sensing

Context:

  • Atomic spectral lines exhibit wavelength shifts influenced by environmental parameters.
  • Understanding these shifts is crucial for accurate spectral analysis.

Purpose:

  • To investigate and quantify the relationship between environmental factors (temperature, humidity, pressure) and atomic spectral line shifts.
  • To develop and experimentally validate polynomial equations describing these relationships.
  • To explore the nonlinear correlation between spectral line half-width and temperature.

Summary:

  • Observed one-dimensional wavelength shifts of atomic spectral lines (0-800 nm range).
  • Established polynomial equations linking wavelength shift magnitude to temperature, humidity, and pressure.
  • Experimentally confirmed the universality of these derived equations.
  • Identified a nonlinear relationship between spectral line half-width and temperature.
  • Designed and tested an intelligent wavelength calibration device (IWC) based on these findings.

Impact:

  • Provides a foundational understanding of environmental influences on atomic spectra.
  • Enables the development of more accurate and robust spectroscopic calibration methods.
  • The developed IWC demonstrates practical utility and effectiveness in sample analysis.