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NMR Spectroscopy: Chemical Shift Overview01:15

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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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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Chemical Shift: Internal References and Solvent Effects01:17

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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IR Spectroscopy: Molecular Vibration Overview01:24

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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Composition- and Temperature-Resolved Raman Shift of Silicon.

XueXian Yang1, Yonghui Liu2, Xin Juan Liu3

  • 11 Key Laboratory of Mineral Cleaner Production and Exploit of Green Functional Materials, Jishou University, Hunan, China.

Applied Spectroscopy
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This study reveals how Raman shifts in silicon-germanium alloys depend on composition and temperature. The findings provide insights into bond thermodynamics and the power of Raman spectroscopy.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Spectroscopy

Background:

  • Raman spectroscopy is a key technique for probing material properties.
  • Understanding the behavior of silicon-germanium (SiGe) alloys is crucial for semiconductor applications.
  • The temperature and composition dependence of Raman shifts in SiGe alloys requires a deeper mechanistic understanding.

Purpose of the Study:

  • To formulate the composition and temperature dependence of the Raman shift in Si and SiGe alloys.
  • To explore the underlying mechanisms using bond order-length-strength correlation and local bond average approaches.
  • To quantitatively analyze the factors contributing to phonon softening in SiGe alloys.

Main Methods:

  • Utilized bond order-length-strength correlation and local bond average approaches.
  • Developed a model where Raman shift (Δω) is proportional to zE1/2/d.
  • Incorporated temperature and composition-dependent changes in bond length (d) and energy (E).

Main Results:

  • Verified the relationship Δω ∝ zE1/2/d for Si and SiGe.
  • Quantitatively reproduced the thermally induced phonon softening in SiGe alloys.
  • Identified bond thermal expansion and energy loss as primary drivers of frequency redshift.

Conclusions:

  • The study provides quantitative information on bond energy and reference frequencies influencing Raman shifts.
  • Gained deeper insight into the fundamental mechanism of Raman shift variations.
  • Demonstrated the utility of Raman spectroscopy for investigating bonding thermodynamics.