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IR Spectrometers

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...

Infrared (IR) Spectroscopy: Overview

Infrared (IR) Spectroscopy: Overview

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...

IR Frequency Region: Fingerprint Region

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: Molecular Vibration Overview

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...

IR Spectrum

IR Spectrum

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% (complete...

Applications of IR Spectroscopy: Overview

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,...

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High-definition Fourier Transform Infrared (FT-IR) Spectroscopic Imaging of Human Tissue Sections towards Improving Pathology

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Visible-infrared two-dimensional Fourier-transform spectroscopy.

Nadia Belabas, Manuel Joffre

|November 23, 2007

Summary

This summary is machine-generated.

Researchers developed a new optical spectroscopy technique using visible light to study infrared emissions. This method utilizes second-order nonlinear optical effects for enhanced material analysis.

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Area of Science:

Optics and Spectroscopy
Nonlinear Optics
Materials Science

Background:

Multidimensional Fourier-transform spectroscopy (MDFT) is a powerful tool for analyzing complex materials.
Existing MDFT techniques often require specialized setups and can be limited in their spectral range.
Visible excitation and infrared emission configurations offer unique advantages for probing specific material properties.

Purpose of the Study:

To introduce and demonstrate a novel class of optical multidimensional Fourier-transform spectroscopy.
To establish a visible excitation-infrared emission configuration for probing second-order nonlinear optical responses.
To showcase the technique's capability in characterizing materials with known nonlinear properties.

Main Methods:

Development of a new optical spectroscopy setup.
Utilizing a visible excitation-infrared emission configuration.
Employing femtosecond double-pulse excitation and coherent mid-infrared field detection.
Characterization of a phase-matched sample with a known nonlinear response.

Main Results:

Successful implementation of the new spectroscopy class.
Demonstration of second-order optical nonlinearities in the visible-to-infrared conversion process.
Coherent measurement of the mid-infrared emitted field.
Validation of the technique on a well-characterized nonlinear material.

Conclusions:

The developed visible excitation-infrared emission spectroscopy is a viable new tool for optical measurements.
This technique provides a sensitive method for probing second-order nonlinear optical properties.
The findings open avenues for advanced spectroscopic analysis of various materials.