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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
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.
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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...

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Conducting Multiple Imaging Modes with One Fluorescence Microscope
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Low-cost spectroscopy with a variable multivariate optical element.

Natallia Uzunbajakava1, Peter de Peinder, Gert W 't Hooft

  • 1Philips Research Europe, High Tech Campus 34, 5656 AE, Eindhoven, The Netherlands.

Analytical Chemistry
|October 14, 2006
PubMed
Summary

A novel variable multivariate optical element (VMOE) using liquid crystal technology enables dynamic, high-resolution spectral analysis. This innovation accurately quantifies components in complex mixtures, paving the way for improved chemical sensing applications.

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Area of Science:

  • Optical Engineering
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Conventional multivariate optical elements (MOEs) are static and offer limited spectral resolution.
  • Accurate quantification of individual components in complex mixtures remains a challenge in chemical analysis.

Purpose of the Study:

  • To report the successful realization of a dynamic variable multivariate optical element (VMOE) using a transmissive liquid crystal panel.
  • To demonstrate the VMOE's capability for analyzing multiple analytes in mixtures with high spectral resolution.

Main Methods:

  • Implementation of a VMOE based on a liquid crystal panel within a Raman spectrometer.
  • Development of a dedicated optical design for enhanced system performance.

Main Results:

  • The VMOE system successfully predicted individual component concentrations in toluene-acetonitrile-cyclohexane mixtures with a prediction error below 6% (mass percentage).
  • The VMOE demonstrated superior spectral resolution compared to conventional MOEs.

Conclusions:

  • The liquid crystal-based VMOE represents a significant advancement in dynamic optical analysis.
  • Future optical design improvements are expected to reduce prediction errors to below 2% for this chemical system, enhancing analytical capabilities.