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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

2.8K
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...
2.8K
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

5.4K
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...
5.4K
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

1.4K
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
1.4K
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

5.0K
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...
5.0K
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

2.4K
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,...
2.4K
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

1.8K
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...
1.8K

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Upconversion-enabled array spectrometer for the mid-infrared, featuring kilohertz spectra acquisition rates.

Sebastian Wolf, Jens Kiessling, Michael Kunz

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    This study introduces mid-infrared spectroscopy using nonlinear-optical upconversion, enabling sensitive detection of broad spectral windows. This innovation overcomes limitations of traditional mid-infrared grating spectrometers for analyzing dynamic processes.

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    Area of Science:

    • Spectroscopy
    • Nonlinear Optics
    • Analytical Chemistry

    Background:

    • Mid-infrared (MIR) spectroscopy is crucial in science and industry.
    • MIR grating spectrometers are limited by detector availability and performance.
    • Existing technologies hinder the analysis of dynamic processes in the MIR range.

    Purpose of the Study:

    • To enable sensitive mid-infrared spectroscopy using nonlinear-optical upconversion.
    • To overcome the limitations of current MIR grating spectrometers.
    • To demonstrate applicability for analyzing highly dynamic processes.

    Main Methods:

    • Utilized continuous-wave nonlinear-optical upconversion.
    • Upconverted a broad spectral window (3.7–4.7 μm) to the near-infrared (825–867 nm).
    • Employed a silicon-camera-based near-infrared grating spectrometer for detection.

    Main Results:

    • Achieved high sensitivity down to sub-picowatt input power.
    • Developed a theoretical model accurately describing the upconversion and system behavior.
    • Successfully performed spectroscopic flame emission measurements.

    Conclusions:

    • Continuous-wave nonlinear-optical upconversion enables effective mid-infrared spectroscopy.
    • The developed system offers high sensitivity and broad spectral coverage.
    • Demonstrated potential for analyzing highly dynamic processes with this novel approach.