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

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 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...
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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...
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,...

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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Wave-front-dividing circular-reflector interferometer for the far infrared.

P Bruelemans, S Kolenberg, P Janssen

    Applied Optics
    |November 25, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new circular-reflector interferometer offers superior modulation efficiency across broad far-infrared spectral regions compared to lamellar gratings, without using beam splitters.

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    Published on: March 22, 2019

    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Far-Infrared Technology

    Background:

    • Interferometers are crucial for spectroscopic analysis, particularly in the far-infrared (far-IR) spectrum.
    • Existing designs like lamellar gratings, Michelson, and Martin-Puplett interferometers have limitations in efficiency and spectral range.
    • The development of novel interferometer designs is essential for advancing far-IR applications.

    Purpose of the Study:

    • To investigate the efficiency of a novel wave-front-dividing interferometer utilizing circular symmetric reflectors.
    • To compare its performance against traditional lamellar gratings in the far-IR spectral region.
    • To evaluate the impact of omitting beam splitters on interferometer performance.

    Main Methods:

    • Theoretical analysis of a wave-front-dividing interferometer with circular symmetric reflectors.
    • Comparative performance evaluation against a lamellar grating interferometer.
    • Focus on modulation efficiency across various spectral regions in the far-IR.

    Main Results:

    • The circular-reflector interferometer demonstrates significantly more efficient modulation compared to the lamellar grating.
    • This enhanced efficiency is maintained over larger spectral regions in the far-IR.
    • The design successfully operates without the need for conventional beam splitters.

    Conclusions:

    • Wave-front-dividing interferometers with circular symmetric reflectors present a promising alternative for far-IR spectroscopy.
    • Their superior modulation efficiency and broader spectral coverage offer advantages over lamellar gratings.
    • The absence of beam splitters simplifies the design and potentially reduces optical losses.