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Related Concept Videos

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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...
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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 Spectroscopy: Woodward–Fieser Rules01:29

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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...
Molecular Spectroscopy: Absorption and Emission01:14

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and unsymmetrical carbonyl vibration.
In the...

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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Self modulating, derivative optical spectroscopy. Part II: experimental.

G Bonfiglioli1, P Brovetto, G Busca

  • 1Istituto Elettroteenico Nazionale Galileo Ferraris, Torino, Italy.

Applied Optics
|January 9, 2010
PubMed
Summary
This summary is machine-generated.

A prototype of the self-modulating derivative optical spectrometer (SMODOS) is described, detailing its optical and electronic components. Performance examples showcase the instrument's capabilities and the method's effectiveness.

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Area of Science:

  • Spectroscopy
  • Optical Engineering
  • Instrument Design

Background:

  • Building upon theoretical principles of self-modulating derivative optical spectrometers (SMODOS).
  • Addressing the need for detailed descriptions of practical SMODOS instrument prototypes.

Purpose of the Study:

  • To provide a comprehensive description of a SMODOS prototype.
  • To discuss the project criteria and design considerations.
  • To present performance data validating the SMODOS method.

Main Methods:

  • Detailed description of the optical components of the SMODOS prototype.
  • Detailed description of the electronic components of the SMODOS prototype.
  • Analysis of project criteria and design choices.

Main Results:

  • Successful construction and description of a functional SMODOS prototype.
  • Demonstration of the instrument's performance capabilities.
  • Validation of the SMODOS technique through practical application.

Conclusions:

  • The presented SMODOS prototype is fully described, encompassing both optical and electronic aspects.
  • The performance data confirms the efficacy and power of the self-modulating derivative optical spectrometry method.
  • This work provides a practical foundation for further development and application of SMODOS instruments.