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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
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...
Classification of Titrimetric Analysis Based on Reaction Types01:01

Classification of Titrimetric Analysis Based on Reaction Types

Titrimetric analysis in solution chemistry involves measuring the volume of solutions and is often called volumetric analysis. The standard solution of known concentration in the burette is called the titrant, whereas the solution of unknown concentration in the flask is called the analyte, or titrand. Titrimetric analyses can be classified into four types based on the reactions between the titrant and analyte.
Titrations between an acid and a base lead to neutralization reactions that form...
Spectroscopy of Carboxylic Acid Derivatives01:26

Spectroscopy of Carboxylic Acid Derivatives

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...
Mass Spectrometry: Branched Alkane Fragmentation01:29

Mass Spectrometry: Branched Alkane Fragmentation

This lesson delves into the mass spectrometry of branched alkane fragmentation. Branched alkanes possess secondary or tertiary carbon atoms, which generate relatively stable carbocations if the cleavage occurs at the branching point. The high stability of carbocations drives the instant fragmentation of branched alkanes. Accordingly, the branched alkane's molecular ion peak is very weak or invisible in the mass spectra, especially in comparison to a linear alkane.
IR and UV–Vis Spectroscopy of Carboxylic Acids01:28

IR and UV–Vis Spectroscopy of Carboxylic Acids

In IR spectroscopy of carboxylic acids, the C=O bond shows a characteristic band between 1710 and 1760 cm⁻¹, and the O–H bond exhibits a broad band between 2500 and 3300 cm⁻¹.
However, the stretching absorptions for the C=O bond vary depending on the structure of carboxylic acids. The C=O bond of the free carboxylic acids shows a higher stretching frequency, 1760 cm−1, while H-bonded carboxylic acids (dimers) exhibit stretching absorptions at a lower frequency, 1710 cm−1. The C=O bond of the...

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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
09:57

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

[A fast classification method for petroleum products based on the Raman spectroscopy].

Sheng Li1, Lian-Kui Dai

  • 1State Key Lab of Industrial Control Technology, Zhejiang University, Hangzhou 310027, China. sli@iipc.zju.edu.cn

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|January 19, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a rapid Raman spectroscopy method for classifying petroleum products. The technique accurately identifies known samples and detects unknown ones with minimal computational resources and human input.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy

Context:

  • Accurate classification of petroleum products is crucial for quality control and regulatory compliance.
  • Traditional methods can be time-consuming and require significant human intervention.

Purpose:

  • To develop a fast, effective, and automated method for petroleum product classification using Raman spectroscopy.
  • To establish a robust knowledge base for accurate spectral analysis and classification.

Summary:

  • A novel classification method utilizing Raman spectroscopy and a pre-established knowledge base of spectral features and thresholds is presented.
  • The method calculates correlation coefficients between test samples and intra-class features, classifying samples based on these correlations against defined thresholds.
  • Experimental validation on 96 known and 4 unknown petroleum samples demonstrated high accuracy in classification and identification of unknowns.

Impact:

  • This automated Raman spectroscopy approach offers a computationally efficient and easily implementable solution for petroleum product analysis.
  • The method reduces the need for human interference, paving the way for streamlined industrial applications in petroleum quality assessment.