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Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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Related Experiment Video

Updated: Jun 17, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

Simultaneous reference and differential waveform acquisition in time-resolved terahertz spectroscopy.

Krzysztof Iwaszczuk1, David G Cooke, Masazumi Fujiwara

  • 1DTU Fotonik-Department of Photonics Engineering, Technical University of Denmark, Lyngby, Denmark.

Optics Express
|December 10, 2009
PubMed
Summary
This summary is machine-generated.

We developed a faster method for terahertz spectroscopy data acquisition using simultaneous scans. This technique improves accuracy by reducing noise and enabling measurements beyond 5 THz.

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Area of Science:

  • Spectroscopy
  • Optics
  • Materials Science

Background:

  • Time-resolved terahertz spectroscopy is crucial for material characterization.
  • Existing methods face limitations in speed and noise reduction.
  • Accurate data acquisition is vital, especially at higher frequencies.

Purpose of the Study:

  • To introduce a novel, accelerated data acquisition method for terahertz spectroscopy.
  • To enhance signal-to-noise ratio and minimize experimental artifacts.
  • To extend the accessible frequency range in terahertz experiments.

Main Methods:

  • Simultaneous collection of reference and differential terahertz scans.
  • Modulation of optical THz generation and pump beams at distinct, non-harmonic frequencies.
  • Utilizing the nonlinear crystal N-benzyl-2-methyl-4-nitroaniline (BNA) for THz generation.

Main Results:

  • Achieved a twofold increase in data acquisition speed.
  • Significantly minimized noise from laser power fluctuations and timing instabilities.
  • Enabled reliable time-resolved terahertz spectroscopy measurements extending beyond 5 THz.

Conclusions:

  • The presented method offers substantial improvements in speed and accuracy for terahertz spectroscopy.
  • This technique is particularly advantageous for high-frequency measurements where phase errors are critical.
  • The approach facilitates more robust and efficient terahertz spectroscopic analysis.