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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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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 Spectrometers01:25

IR Spectrometers

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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...
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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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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Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

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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,...
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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

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Upconversion time-stretch infrared spectroscopy.

Kazuki Hashimoto1, Takuma Nakamura1, Takahiro Kageyama2

  • 1Institute for Photon Science and Technology, The University of Tokyo, Tokyo, 113-0033, Japan.

Light, Science & Applications
|March 3, 2023
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Summary
This summary is machine-generated.

This study introduces an advanced time-stretch infrared spectroscopy method, achieving high-speed, high-resolution molecular measurements. The technique significantly enhances spectral data acquisition for molecular dynamics and hyperspectral imaging.

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Area of Science:

  • Spectroscopy
  • Molecular Science
  • Optical Engineering

Background:

  • Ultrafast spectroscopy is limited by signal-to-noise ratio, hindering high-speed measurements.
  • Current Fourier-transform infrared spectrometers and time-stretch infrared spectroscopy have limitations in measurement rate, spectral elements, and resolution.

Purpose of the Study:

  • To develop a high-speed, high-resolution mid-infrared spectroscopy technique.
  • To overcome the limitations of existing ultrafast spectroscopy methods.

Main Methods:

  • Incorporation of a nonlinear upconversion process into time-stretch infrared spectroscopy.
  • Mapping mid-infrared spectra to the near-infrared telecommunication region for low-loss time-stretching and low-noise detection.
  • Utilizing a single-mode optical fiber and a high-bandwidth photoreceiver.

Main Results:

  • Increased measurable spectral elements to over 1000.
  • Achieved high-resolution mid-infrared spectroscopy (0.017 cm-1) of gas-phase methane.
  • Demonstrated a significant improvement in speed and spectral data acquisition capabilities.

Conclusions:

  • The developed technique offers unprecedented speed and resolution for vibrational spectroscopy.
  • This advancement enables the study of ultrafast dynamics, large-scale spectral data analysis, and high-frame-rate hyperspectral imaging.