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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...

UV–Vis Spectrometers

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...

Atomic Absorption Spectroscopy: Instrumentation

Atomic Absorption Spectroscopy: Instrumentation

An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...

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).
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Updated: Jun 15, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

Published on: December 22, 2015

Precise measurements with a compact vacuum infrared spectrometer.

D B Braund, A R Cole, J A Cugley

|March 12, 2010

Summary

A new vacuum infrared spectrometer achieves high resolution for precise molecular measurements. This advanced instrument enhances spectral analysis accuracy for scientific research.

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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

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In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions

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Published on: June 16, 2014

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

Area of Science:

Spectroscopy
Infrared Spectroscopy
Molecular Spectroscopy

Background:

High-resolution spectroscopy is crucial for detailed molecular analysis.
Existing instruments may have limitations in resolution and precision.
Accurate wavenumber measurements are essential for identifying molecular species and transitions.

Purpose of the Study:

To describe a novel 3-meter vacuum grating infrared spectrometer.
To demonstrate its enhanced resolution capabilities.
To validate the instrument's precision using known molecular bands.

Main Methods:

Utilized a 3-meter vacuum grating infrared spectrometer with digital recording.
Implemented a fast deconvolution procedure to improve spectral resolution.
Employed a Merton nut mechanism in the grating drive for precise wavenumber measurements.
Measured spectral lines in the N2O 12(0)21 band near 4630 cm(-1).

Main Results:

Achieved a spectral resolution better than 0.025 cm(-1) at 3000 cm(-1).
Enhanced resolution to approximately 0.010 cm(-1) using deconvolution techniques.
Measured N2O spectral lines with an average agreement of +/-0.0004 cm(-1) compared to interferometric data.

Conclusions:

The developed spectrometer offers superior resolution and precision for infrared spectral analysis.
The fast deconvolution method effectively enhances spectral resolution.
The instrument's accuracy is validated by precise measurements of N2O spectral lines, comparable to interferometric results.