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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...
IR Spectrum01:19

IR Spectrum

When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...
UV–Vis Spectrometers01:14

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: Instrumentation01:22

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...
Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...

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High-definition Fourier Transform Infrared (FT-IR) Spectroscopic Imaging of Human Tissue Sections towards Improving Pathology
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High-definition Fourier Transform Infrared (FT-IR) Spectroscopic Imaging of Human Tissue Sections towards Improving Pathology

Published on: January 21, 2015

Nanosecond infrared absorption spectrometer.

M A Young, G C Pimentel

    Applied Optics
    |June 18, 2010
    PubMed
    Summary
    This summary is machine-generated.

    We developed a new time-resolved infrared spectrometer using stimulated Raman scattering for rapid analysis. This instrument achieves nanosecond resolution, enabling the study of short-lived molecules like gas-phase radicals.

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    Area of Science:

    • Spectroscopy
    • Physical Chemistry
    • Chemical Physics

    Background:

    • Time-resolved spectroscopy is crucial for studying transient molecular species.
    • Existing methods may lack the necessary time resolution or spectral bandwidth for certain applications.
    • Investigating short-lived radicals requires advanced spectroscopic techniques.

    Purpose of the Study:

    • To detail the design of a novel time-resolved infrared absorption spectrometer.
    • To achieve nanosecond time resolution and broadband spectral coverage.
    • To demonstrate the spectrometer's utility for studying short-lived molecular species.

    Main Methods:

    • Utilized stimulated electronic Raman scattering in metal vapor for a ~1 ns IR probe pulse.
    • Employed a multielement detector array for broadband infrared light collection.
    • Integrated specialized signal collection circuitry for efficient data acquisition.

    Main Results:

    • Successfully designed and constructed a time-resolved IR absorption spectrometer.
    • Achieved nanosecond time resolution with broadband probe capability.
    • Recorded IR spectra of gas-phase radicals, confirming instrument performance.

    Conclusions:

    • The developed spectrometer is suitable for spectroscopic and kinetic investigations.
    • The instrument enables the study of transient species with high temporal resolution.
    • This technology advances the capability for analyzing short-lived molecular phenomena.