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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

1.1K
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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Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

445
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,...
445
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

1.4K
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...
1.4K
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

682
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...
682
IR Spectrum01:19

IR Spectrum

887
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
887
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

258
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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High-definition Fourier Transform Infrared FT-IR Spectroscopic Imaging of Human Tissue Sections towards Improving Pathology
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Quantum Fourier Transform Infrared Spectroscopy: Evaluation, Benchmarking, and Prospects.

Paul Gattinger1, Andreas W Schell2, Sven Ramelow3

  • 1Research Center for Non-Destructive Testing, Linz, Austria.

Applied Spectroscopy
|May 21, 2025
PubMed
Summary
This summary is machine-generated.

Quantum Fourier transform infrared spectroscopy (QFT-IR) uses undetected photons for mid-infrared measurements in the near-infrared range. This novel approach offers a competitive alternative to conventional FT-IR, especially under specific conditions.

Keywords:
FT-IRFourier transform infrared spectroscopyInfrared spectroscopyQFT-IRentangled photonsquantum FT-IRsensing with undetected photons

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Area of Science:

  • Quantum optics
  • Spectroscopy
  • Infrared technology

Background:

  • Fourier transform infrared spectroscopy (FT-IR) traditionally requires specialized detectors for mid-infrared (mid-IR) measurements.
  • Undetected photon sensing offers unconventional pathways for spectroscopic analysis.
  • Entangled photon pairs can enable mid-IR information retrieval in the near-infrared (near-IR) spectral domain.

Purpose of the Study:

  • To investigate the practical aspects and performance of a quantum Fourier transform infrared spectroscopy (QFT-IR) implementation.
  • To evaluate the stability and competitiveness of QFT-IR against conventional FT-IR instruments.
  • To demonstrate the feasibility of mid-IR vibrational spectroscopy using silicon-based detectors via undetected photon sensing.

Main Methods:

  • Utilized non-degenerate entangled photon pairs to down-convert mid-IR information to the near-IR spectral domain.
  • Implemented a QFT-IR system operating in the 3000 cm-1 to 2380 cm-1 range with detection at ~12,500 cm-1.
  • Employed Allan-Werle plots for stability analysis and comparative spectroscopic measurements of polymer thin films against a commercial FT-IR.

Main Results:

  • The QFT-IR system demonstrated low mid-IR probing power (68 pW) with a signal-to-noise ratio power dependence of 1.5 × 105 mW-1/2.
  • Short- and long-term stability of the QFT-IR system was experimentally evaluated.
  • Comparative measurements showed QFT-IR's potential to be competitive with or outperform conventional FT-IR under certain conditions.

Conclusions:

  • QFT-IR provides a viable method for mid-IR vibrational spectroscopy using accessible silicon-based detectors.
  • The technology shows promise for practical applications where conventional FT-IR may be limited.
  • Further research can optimize QFT-IR for enhanced performance and broader adoption in spectroscopic analysis.