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Related Concept Videos

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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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When drugs are administered extravascularly, a comprehensive evaluation through noncompartmental analysis becomes imperative. This analytical approach considers various parameters that play a crucial role in understanding the pharmacokinetics of these drugs.
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Methods for Studying Drug Absorption: In vitro01:16

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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
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Methods for Studying Drug Absorption: In situ01:09

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In situ experiments, such as the Doluisio method and Single-Pass Perfusion technique, provide critical insights into drug uptake by simulating in vivo conditions for drug absorption.
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This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
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NMR Spectrometers: Overview01:20

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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
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A novel multiplex absorption spectrometer for time-resolved studies.

Thomas Lewis1, Dwayne E Heard1, Mark A Blitz1

  • 1School of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom.

The Review of Scientific Instruments
|March 3, 2018
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Summary
This summary is machine-generated.

A new Time-Resolved Ultraviolet/Visible (UV/Vis) Absorption Spectrometer (TRUVAS) offers millisecond resolution for chemical reaction studies. This instrument enhances sensitivity and versatility for analyzing transient species like peroxy radicals.

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Area of Science:

  • Chemical Kinetics
  • Spectroscopy
  • Atmospheric Chemistry

Background:

  • Chemical reactions often involve transient species that are difficult to study.
  • Existing spectroscopic methods may lack the necessary time resolution or sensitivity.

Purpose of the Study:

  • To develop and demonstrate a novel Time-Resolved Ultraviolet/Visible (UV/Vis) Absorption Spectrometer (TRUVAS).
  • To achieve high sensitivity and millisecond time resolution for studying chemical kinetics.

Main Methods:

  • Utilized a pulsed photolysis laser (KrF, 248 nm) to initiate reactions.
  • Employed a unique multipass optics arrangement for enhanced probe beam-photolysis laser overlap.
  • Integrated two high-throughput spectrographs with line-array CCDs for simultaneous broad wavelength monitoring (200-800 nm).

Main Results:

  • Achieved millisecond time resolution for absorption measurements across the UV/Vis spectrum.
  • Demonstrated high sensitivity, measuring time-resolved absorbances down to 2.3 × 10-5.
  • Successfully measured the absorption spectrum and self-reaction kinetics of the HOCH2CH2O2 radical.

Conclusions:

  • The developed TRUVAS instrument is a powerful tool for kinetic studies of transient species.
  • Its novel optical design and detection system provide exceptional sensitivity and versatility.
  • The instrument's capability was validated through the characterization of the HOCH2CH2O2 radical.