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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...

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Related Experiment Video

Updated: Jun 17, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

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Published on: August 12, 2013

A high-resolution, far infrared double-beam lamellar grating interferometer.

R T Hall1, D Vrabec, J M Dowling

  • 1The Aerospace Corporation, Space PhysicsLaboratory, Los Angeles, California 90045, USA.

Applied Optics
|January 6, 2010
PubMed
Summary
This summary is machine-generated.

A new far infrared lamellar grating interferometer offers high-resolution spectroscopy for molecular analysis. This instrument precisely measures spectral lines for applications in atmospheric and chemical research.

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Last Updated: Jun 17, 2026

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Area of Science:

  • Spectroscopy
  • Far Infrared (FIR) Spectroscopy
  • Molecular Spectroscopy

Background:

  • High-resolution spectroscopy is crucial for identifying molecular species and understanding their properties.
  • Existing instruments may have limitations in spectral range or resolution for certain applications.

Purpose of the Study:

  • To describe a novel high-resolution, far infrared lamellar grating interferometer.
  • To demonstrate the instrument's performance in the 10 cm⁻¹ to 125 cm⁻¹ frequency range.

Main Methods:

  • Utilized a lamellar grating interferometer operating in single-beam or double-beam differencing modes.
  • Recorded the pure rotational spectrum of water vapor and deuterium chloride (DCl).

Main Results:

  • Achieved high spectral resolution, measuring absorption line centers to within ±0.008 cm⁻¹.
  • Clearly resolved the Cl(35)-Cl(37) isotope splitting of the DCl J = 2 → 3 transition (0.094 cm⁻¹ separation).

Conclusions:

  • The developed far infrared interferometer provides high-resolution spectral data.
  • The instrument is suitable for detailed molecular studies, including isotopic analysis.