Related Experiment Video
Updated: May 31, 2026

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
Published on: December 1, 2023
Near-infrared vibrational second harmonic generation: a new nonlinear interfacial vibrational spectroscopy
Somaiyeh Dadashi1, Ziyad Thekkayil1, Eric Borguet1
1Department of Chemistry, Temple University, Philadelphia, PA, USA. eborguet@temple.edu.
Near-infrared vibrational second harmonic generation (NIR-vSHG) measures interfacial bond properties. This new technique offers advantages over traditional methods for studying surface chemistry and bond activation.
Area of Science:
- Surface Science
- Spectroscopy
- Physical Chemistry
Background:
- Determining bond anharmonicity constant (χeν̃e) and dissociation energy (De) at interfaces is crucial for understanding chemical processes.
- Studying overtone transitions in the near-infrared region is key to examining these properties.
Purpose of the Study:
- To introduce and validate near-infrared vibrational second harmonic generation (NIR-vSHG) as a novel technique for interfacial analysis.
- To investigate interfacial bond properties, specifically the OH overtone at muscovite mica and CH stretch in organic molecules at alumina interfaces.
Main Methods:
- Utilized near-infrared vibrational second harmonic generation (NIR-vSHG), a nonlinear spectroscopic technique.
- Applied NIR-vSHG to study buried near-surface free OH at muscovite mica surfaces and CH stretch in chloroform and acetonitrile at alumina interfaces.
Main Results:
- NIR-vSHG successfully studied overtone transitions of interfacial species.
- Demonstrated advantages of NIR-vSHG over mid-infrared vibrational sum frequency generation (MIR-vSFG), including simplified spectral analysis and enhanced optical accessibility.
- Provided bond dissociation energy information relevant to interfacial bond activation.
Conclusions:
- NIR-vSHG is a powerful new tool for detecting vibrational characteristics of interfacial environments.
- The technique offers significant advantages for surface-specific studies, simplifying analysis and improving accessibility.
- This work advances the understanding of interfacial bond dynamics and provides a new method for their characterization.
More Related Videos
09:43Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
Published on: August 13, 2019
09:57Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
Related Concept Videos
IR Spectroscopy: Molecular Vibration Overview
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...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration
According to Hooke's law, the vibrational frequency is directly proportional to the...
Infrared (IR) Spectroscopy: Overview
Different compounds display unique properties due to their...
UV–Vis Spectroscopy: Molecular Electronic Transitions
IR Absorption Frequency: Hybridization
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that stretch at a...
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...