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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
Discrete Fourier Transform01:15

Discrete Fourier Transform

The Discrete Fourier Transform (DFT) is a fundamental tool in signal processing, extending the discrete-time Fourier transform by evaluating discrete signals at uniformly spaced frequency intervals. This transformation converts a finite sequence of time-domain samples into frequency components, each representing complex sinusoids ordered by frequency. The DFT translates these sequences into the frequency domain, effectively indicating the magnitude and phase of each frequency component present...
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...
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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 C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...

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Related Experiment Video

Updated: Jul 6, 2026

Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
10:03

Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy

Published on: June 27, 2014

High-information time-resolved Fourier transform spectroscopy at work.

N Picqué1, G Guelachvili

  • 1Laboratoire de Photophysique Moléculaire, Unité Propre du Centre National de la Recherche Scientifique, Université de Paris-Sud, Bâtiment 350, 91405 Orsay Cedex, France.

Applied Optics
|March 20, 2008
PubMed
Summary
This summary is machine-generated.

A new instrumental setup enables rapid recording of time-resolved Fourier transform (TRFT) interferograms for gas-phase spectra. This advancement significantly reduces data acquisition time for high-resolution spectral analysis.

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Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
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Area of Science:

  • Spectroscopy
  • Molecular Physics
  • Instrumental Science

Background:

  • High-resolution spectral analysis requires extensive data acquisition.
  • Previous methods for time-resolved Fourier transform (TRFT) interferograms were time-consuming.

Purpose of the Study:

  • To develop a novel instrumental setup for rapid TRFT interferogram recording.
  • To achieve high spectral and time resolution in gas-phase spectroscopy.

Main Methods:

  • Utilized a stepping-mode Connes-type interferometer.
  • Developed a new instrumental setup for TRFT interferometry.
  • Recorded infrared spectra of N(2) transitions and atomic Ar lines.

Main Results:

  • Achieved spectral resolution of 2.5 x 10(-3) cm(-1) and time resolution of 2 ns.
  • Reduced data acquisition time by a factor of approximately 50,000.
  • Successfully recorded high-resolution TRFT spectra in the infrared range.

Conclusions:

  • The new setup drastically accelerates the acquisition of high-resolution TRFT spectra.
  • This advancement opens new possibilities for studying dynamic processes in gases.
  • Enables obtaining in hours what previously took years of measurement.