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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

2.1K
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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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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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
937
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

4.3K
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...
4.3K
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

1.9K
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,...
1.9K
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

1.8K
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...
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Sensitivity-Enhanced Fourier Transform Mid-Infrared Spectroscopy Using a Supercontinuum Laser Source.

Ivan Zorin1, Jakob Kilgus1, Kristina Duswald1

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Applied Spectroscopy
|February 26, 2020
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Summary

Supercontinuum lasers enhance Fourier transform infrared (FT-IR) spectroscopy by enabling longer path lengths and improving detection limits. This advanced light source offers similar noise performance to traditional thermal emitters for mid-infrared analysis.

Keywords:
FT-IRFourier transform infrared spectroscopyMid-infrared spectroscopymid-IRsupercontinuum laser source

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Area of Science:

  • Spectroscopy
  • Analytical Chemistry
  • Laser Physics

Background:

  • Fourier transform infrared (FT-IR) spectroscopy traditionally uses thermal emitters for mid-infrared analysis.
  • Supercontinuum lasers offer high brightness, broadband coverage, and stability in the mid-IR region.
  • Integrating these lasers could significantly advance FT-IR capabilities.

Purpose of the Study:

  • To introduce mid-infrared supercontinuum lasers as a replacement for thermal emitters in FT-IR spectrometers.
  • To propose and detail an efficient coupling method for pulsed supercontinuum sources.
  • To evaluate the performance, stability, and analytical capabilities of a supercontinuum-based FT-IR system.

Main Methods:

  • Developed an approach for coupling pulsed mid-IR supercontinuum lasers to FT-IR spectrometers.
  • Characterized pulse-to-pulse energy fluctuations, noise, and long-term stability of the supercontinuum laser system.
  • Conducted comparative measurements against a conventional FT-IR instrument with a thermal emitter.

Main Results:

  • Achieved comparable noise levels to conventional FT-IR systems using the supercontinuum laser.
  • Demonstrated a four-times-enhanced detection limit for formaldehyde solutions due to extended path length (500 µm vs. 130 µm).
  • Validated the analytical performance of the supercontinuum-based FT-IR spectrometer.

Conclusions:

  • FT-IR spectrometers equipped with broadband mid-IR supercontinuum lasers can outperform traditional systems.
  • These advanced systems enable previously unattainable interaction path lengths.
  • The technology maintains low noise levels, offering superior analytical performance.