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Related Concept Videos

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 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...
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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.
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Flame Photometry: Lab01:16

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
Flame Photometry: Overview01:02

Flame Photometry: Overview

Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
Applications of IR Spectroscopy: Overview01:11

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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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Related Experiment Video

Updated: Jun 17, 2026

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
06:14

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Published on: July 30, 2020

An earth-based, infrared lunar mapper for thermal and composition studies.

J D Rehnberg1, J R Yoder, G R Hunt

  • 1Perkin-Elmer Corporation,Norwalk, Connecticut, USA.

Applied Optics
|January 12, 2010
PubMed
Summary

New equipment maps lunar radiance and surface composition using a scanning telescope and a specialized detector. This technology reveals thermal patterns and mineral similarities on the Moon for enhanced lunar exploration.

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Area of Science:

  • Astronomy and Astrophysics
  • Planetary Science
  • Instrumentation and Measurement

Background:

  • Understanding lunar surface composition and thermal patterns is crucial for lunar exploration and resource identification.
  • Previous methods for mapping lunar characteristics were limited in resolution and compositional analysis capabilities.

Purpose of the Study:

  • To develop and demonstrate novel equipment for creating pictorial maps of lunar radiance patterns.
  • To enable the study of potential variations in lunar surface composition through spectral analysis.

Main Methods:

  • A motor-driven platform scans a rectangular raster in the image plane of an astronomical telescope.
  • A liquid helium-cooled germanium detector analyzes a 15 arcmin square field, with its signal modulating a glow lamp to build a pictorial image.
  • The equipment operates in radiometric mode for thermal mapping and compositional study mode for spectral comparison with mineral specimens.

Main Results:

  • The system successfully produces pictorial displays of lunar thermal patterns.
  • Compositional similarity between lunar surface regions and mineral specimens is indicated by dark areas on the map, resulting from converse spectral signals.
  • Pictorial examples demonstrating the equipment's capabilities in both radiometric and compositional modes are provided.

Conclusions:

  • The developed equipment is effective for generating detailed pictorial maps of lunar thermal radiance and surface composition.
  • This technology offers a new approach for in-situ analysis of lunar surface properties, aiding future exploration missions.
  • The ability to compare lunar spectra with known mineral spectra opens avenues for identifying lunar resources and understanding geological history.