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Related Concept Videos

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...
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...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
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...
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...

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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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Implementation and validation of a multi-purpose virtual spectrometer for large systems in complex environments.

Vincenzo Barone1, Alberto Baiardi, Malgorzata Biczysko

  • 1Scuola Normale Superiore and INSTM M3-Village, piazza dei Cavalieri 7, I-56126 Pisa, Italy. vincenzo.barone@sns.it

Physical Chemistry Chemical Physics : PCCP
|July 10, 2012
PubMed
Summary

Researchers are developing a versatile virtual spectrometer for computational spectroscopy. This tool calculates various spectra for biomolecules, aiding in understanding their natural environments and advancing molecular analysis.

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UV-Vis Spectroscopic Characterization of Nanomaterials in Aqueous Media
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UV-Vis Spectroscopic Characterization of Nanomaterials in Aqueous Media

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Area of Science:

  • Computational chemistry and spectroscopy.
  • Biomolecular modeling and analysis.

Background:

  • Computational spectroscopy has advanced, but a unified, user-friendly multi-frequency tool is lacking.
  • Accurate simulation of biomolecules in their natural environments is crucial for understanding their function.

Purpose of the Study:

  • To implement and validate a multi-frequency virtual spectrometer for computational spectroscopy.
  • To provide a user-friendly tool for analyzing biomolecules in various environments.

Main Methods:

  • Development of an integrated computational tool for spectral simulations.
  • Calculation of vibrational (IR, VCD), electronic (absorption, emission, ECD), and magnetic resonance (ESR, NMR) spectra.
  • Inclusion of capabilities for closed- and open-shell systems in vacuo and in condensed phases.

Main Results:

  • The tool computes diverse spectra, including infrared, VCD, electronic, and NMR.
  • It supports both isolated molecules and condensed-phase systems.
  • Features for spectral visualization, comparison, and modification are integrated.

Conclusions:

  • The developed virtual spectrometer offers a comprehensive platform for multi-frequency spectral analysis.
  • Ongoing validation and development aim to enhance its capabilities for biomolecular research.
  • The tool addresses the need for robust and accessible computational spectroscopy methods.