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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

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Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
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IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

1.5K
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
1.5K
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

2.1K
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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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.
For instance, the proton...
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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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Terahertz Imaging and Characterization Protocol for Freshly Excised Breast Cancer Tumors
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[Frequency correction in terahertz absorption spectroscopy].

Bin Wu1, Xue-shun Shi2, Qing Sun3

  • 1Science and Technology on Electronic Test & Measurement Laboratory, Qingdao 266555, China. wubinw@126.com

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|December 28, 2013
PubMed
Summary
This summary is machine-generated.

Measurement errors in terahertz (THz) absorption spectra using terahertz time-domain spectroscopy (THz-TDS) can be corrected. A new model using carbon monoxide spectra significantly reduces errors, improving accuracy for material identification.

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Area of Science:

  • Spectroscopy
  • Physical Chemistry
  • Metrology

Context:

  • Terahertz time-domain spectroscopy (THz-TDS) is a powerful tool for analyzing material properties.
  • Measurement errors in the frequency domain are a known limitation of THz-TDS systems.
  • These errors are often attributed to the sampling accuracy of high-speed electro-optic sampling.

Purpose:

  • To develop and validate a method for correcting measurement errors in THz absorption spectra.
  • To improve the accuracy of THz-TDS measurements for scientific and industrial applications.
  • To establish a reliable error correction model for THz spectroscopy.

Summary:

  • A novel error correction model was developed using the gas-phase carbon monoxide absorption spectrum as a standard.
  • Experimental THz absorption spectra were measured and compared against the JPL database to determine error distributions.
  • The developed model demonstrated a linear correlation with standard absorption frequencies, significantly reducing maximum errors by two orders of magnitude.

Impact:

  • The validated model effectively corrects THz spectral errors caused by electro-optic sampling limitations.
  • Accurate THz-TDS measurements are crucial for reliable material identification.
  • This work contributes to the development of comprehensive molecular spectroscopy databases in the terahertz region.