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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 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...

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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: 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,...

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.

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

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Infrared Fourier spectrometer for airborne and ground-based astronomy.

D S Davis, H P Larson, M Williams

|March 24, 2010

Summary

A new near-infrared astronomical Fourier spectrometer offers high resolution (0.01 cm-1) for ground-based and airborne telescopes. This advanced instrument enables detailed spectral analysis in challenging observational environments.

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Area of Science:

Astronomy
Spectroscopy
Astrophysics

Background:

High-resolution spectroscopy is crucial for astronomical observations.
Existing Fourier spectrometers have limitations in certain observational environments.

Purpose of the Study:

To introduce a novel high-resolving power near-infrared astronomical Fourier spectrometer.
To detail the capabilities and operational advantages of the new instrument.

Main Methods:

Construction of a Fourier spectrometer optimized for near-infrared wavelengths (0.8-5.6 microm).
Designed for operation at Cassegrain foci and on the NASA Kuiper Airborne Observatory.
Achieved a limiting spectral resolution of 0.01 cm(-1).

Main Results:

The spectrometer demonstrates high spectral resolution and broad wavelength coverage.
Successful operation in previously inaccessible observational settings.
Presented diverse astronomical and laboratory spectra acquired using the instrument.

Conclusions:

The developed Fourier spectrometer significantly enhances near-infrared astronomical observation capabilities.
Its unique design allows for high-resolution spectral analysis in challenging environments.
The instrument is poised to yield new insights from astronomical and laboratory studies.