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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...
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,...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...
IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that stretch at a...

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
10:42

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

Published on: March 22, 2019

Infrared upconversion for astronomical applications.

M M Abbas, T Kostiuk, K W Ogilvie

    Applied Optics
    |February 19, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study evaluates an upconversion system for astronomical observations in the infrared spectrum. Researchers determined key performance parameters and presented experimental results, estimating the sensitivity of future upconversion devices.

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    Area of Science:

    • Astronomy and Astrophysics
    • Optical Engineering
    • Infrared Spectroscopy

    Background:

    • Upconversion systems offer potential for observing astronomical sources in the infrared (IR) spectrum.
    • Characterizing performance parameters is crucial for developing effective astronomical instruments.

    Purpose of the Study:

    • To theoretically evaluate and experimentally demonstrate the performance of an upconversion system for astronomical observations.
    • To assess parameters such as conversion efficiency, spectral resolution, field of view, and minimum detectable source brightness.

    Main Methods:

    • Theoretical evaluation of upconversion system performance parameters.
    • Experimental measurements using a lithium niobate upconverter with an argon-ion laser.
    • Blackbody measurements and molecular absorption spectrum analysis.

    Main Results:

    • Theoretical performance parameters for astronomical observations were calculated.
    • Experimental validation was achieved through blackbody and molecular absorption spectrum measurements.
    • The sensitivity of a potential upconversion device was estimated.

    Conclusions:

    • The study provides a comprehensive performance analysis of upconversion systems for infrared astronomy.
    • Experimental results validate theoretical predictions and demonstrate feasibility.
    • Estimates suggest achievable sensitivity with current technology for future upconversion devices.