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Related Concept Videos

IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

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 stretch at a...
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular hydrogen bonding...
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...

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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
07:28

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Published on: August 30, 2012

Hybrid continuous wave terahertz spectroscopy.

Maik Scheller1, Matthias Stecher, Marina Gerhard

  • 1Fachbereich Physik, Philipps Universität Marburg, Renthof 5, 35032 Marburg, Germany. maik.scheller@physik.uni-marburg.de

Optics Express
|August 20, 2010
PubMed
Summary
This summary is machine-generated.

We developed a hybrid terahertz spectroscopy system combining continuous wave and quasi time domain methods. This novel approach offers high spectral intensity and broadband frequency for accurate material thickness measurements.

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Area of Science:

  • Spectroscopy
  • Terahertz (THz) technology
  • Optics and Photonics

Background:

  • Continuous wave (CW) terahertz spectroscopy is valuable for material analysis.
  • Standard CW methods can suffer from ambiguity in thickness measurements.
  • Quasi time domain spectroscopy offers complementary information but often lacks spectral intensity.

Purpose of the Study:

  • To develop a hybrid terahertz spectroscopy architecture.
  • To combine the strengths of CW and quasi time domain spectroscopy.
  • To overcome limitations in current terahertz spectroscopic techniques for thickness determination.

Main Methods:

  • A hybrid system integrating a two-color photomixing setup with a quasi time domain spectrometer.
  • Utilizing a multimode laser diode as the driving source.
  • Implementing a novel architecture for terahertz wave generation and detection.

Main Results:

  • The proposed architecture successfully fuses high spectral intensity with broadband frequency information.
  • The hybrid system overcomes the ambiguity inherent in standard CW terahertz thickness measurements.
  • Demonstrated enhanced performance for material characterization.

Conclusions:

  • The hybrid continuous wave and quasi time domain terahertz spectroscopy system represents a significant advancement.
  • This approach provides a more robust and accurate method for determining material thickness.
  • The developed architecture offers a promising tool for various scientific and industrial applications.