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Related Concept Videos

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...
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: 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...
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,...
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...
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...

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Related Experiment Video

Updated: Jun 20, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

Single-molecule vibrational pumping in SERS.

C M Galloway1, E C Le Ru, P G Etchegoin

  • 1The MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand.

Physical Chemistry Chemical Physics : PCCP
|August 20, 2009
PubMed
Summary
This summary is machine-generated.

Single-molecule vibrational pumping in surface-enhanced Raman scattering (SERS) shows a consistent difference between radiative SERS cross sections. This highlights limitations in using pumping cross-sections as a reliable SERS measure.

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Area of Science:

  • Surface-enhanced Raman scattering (SERS)
  • Single-molecule spectroscopy
  • Vibrational spectroscopy

Background:

  • Surface-enhanced Raman scattering (SERS) enables sensitive molecular detection.
  • Understanding single-molecule SERS phenomena is crucial for advanced spectroscopy.
  • Vibrational pumping is a key process influencing SERS signals.

Purpose of the Study:

  • To rigorously demonstrate single-molecule vibrational pumping in SERS.
  • To investigate the relationship between radiative SERS cross section and pumping cross section.
  • To highlight the limitations of using pumping cross-section as a proxy for SERS cross-section.

Main Methods:

  • Utilized the bi-analyte SERS method at low temperatures.
  • Analyzed Stokes intensity to estimate radiative SERS cross section.
  • Measured the anti-Stokes-to-Stokes ratio to determine pumping cross section.

Main Results:

  • Observed a systematic difference between the two cross-section estimates.
  • The pumping cross section was consistently larger than the radiative SERS cross section.
  • This difference is reliably observed only in the single-molecule SERS regime.

Conclusions:

  • The pumping cross-section is not always a reliable measure of the SERS cross-section.
  • Averaging effects in multi-molecule SERS complicate cross-section estimations.
  • Further investigation into explanations for the observed systematic difference is warranted.