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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...
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
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...
Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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.
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.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...

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Related Experiment Video

Updated: Jun 26, 2026

Observation and Analysis of Blinking Surface-enhanced Raman Scattering
05:52

Observation and Analysis of Blinking Surface-enhanced Raman Scattering

Published on: January 11, 2018

[Obtaining aerosol backscattering coefficient using pure rotational Raman spectrum].

Jia Su1, Yin-chao Zhang, Shun-xing Hu

  • 1Key Lab of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, The Chinese Academy of Sciences, Hefei 230031, China. sujia0804@163.com

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|January 7, 2009
PubMed
Summary

A new method accurately measures aerosol backscattering coefficient ratio using atmospheric temperature and a single rotational Raman spectrum line. This Raman lidar technique avoids assumptions about aerosol extinction and wavelength calibration.

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Observation and Analysis of Blinking Surface-enhanced Raman Scattering
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Area of Science:

  • Atmospheric Science
  • Spectroscopy
  • Lidar Technology

Context:

  • Accurate measurement of atmospheric aerosol properties is crucial for climate modeling and air quality monitoring.
  • Raman lidar is a key remote sensing technique for profiling atmospheric constituents.
  • Existing methods for determining aerosol backscattering coefficient ratio often rely on assumptions or temperature-dependent measurements, introducing potential errors.

Purpose:

  • To develop and validate a novel method for calculating the aerosol backscattering coefficient ratio.
  • To overcome the limitations of traditional methods that use partial rotational Raman spectra, which are sensitive to temperature variations.
  • To enable accurate aerosol backscattering coefficient ratio determination without assuming relationships between aerosol extinction and backscatter or requiring wavelength calibration.

Summary:

  • This study presents a new method to determine the aerosol backscattering coefficient ratio by utilizing the ratio of elastic signal to the total rotational Raman backscattering signal.
  • The method leverages atmospheric temperature and a single rotational Raman spectrum line, eliminating the need to measure the total rotational Raman spectrum intensity.
  • Simulations were performed to analyze the temperature-dependent errors associated with using partial rotational Raman spectrum lines, highlighting the advantages of the proposed approach.

Impact:

  • The developed Raman lidar technique provides a more robust and accurate way to measure aerosol backscattering coefficient ratio.
  • This advancement can improve the reliability of atmospheric aerosol remote sensing data.
  • The findings contribute to better understanding of aerosol optical properties, essential for climate and air quality research.