Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
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...
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...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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...
Inductive Effects on Chemical Shift: Overview01:27

Inductive Effects on Chemical Shift: Overview

The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Stimulated emission to absorption cross-section ratio in quantum-confined lead halide perovskite nanocrystals: cation, shape and size independence.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences·2026
Same author

Quantum Dot Thermal Machines-A Guide to Engineering.

Entropy (Basel, Switzerland)·2026
Same author

Spin blockades to hot multi-exciton relaxation in nanocrystals: Case of CdTe.

The Journal of chemical physics·2025
Same author

Spectator Exciton Effects in Nanocrystals III: Unveiling the Stimulated Emission Cross Section in Quantum Confined CsPbBr<sub>3</sub> Nanocrystals.

Journal of the American Chemical Society·2024
Same author

Orchestrating Nuclear Dynamics in a Permanganate Doped Crystal with Chirped Pump-Probe Spectroscopy.

The journal of physical chemistry letters·2024
Same author

Quantum Molecular Devices.

ACS physical chemistry Au·2024
Same journal

Investigating the stabilizing influences of organic sidechains in epoxides by rotational spectroscopy and computational chemistry: 1,2-epoxyhexane <i>versus</i> 1,2-epoxy-5-hexene.

Physical chemistry chemical physics : PCCP·2026
Same journal

Structure and dynamics of water confined in graphene oxide.

Physical chemistry chemical physics : PCCP·2026
Same journal

Comprehensive first-principles study of group IIIA-VIA A<sub>2</sub>B<sub>3</sub> two-dimensional ferroelectrics.

Physical chemistry chemical physics : PCCP·2026
Same journal

Low-resistance ohmic contacts for NbGeN<sub>3</sub> enabled by cold metals.

Physical chemistry chemical physics : PCCP·2026
Same journal

Integrated first-principles, SCAPS-1D, and a ML framework for numerical modelling and performance optimization of BaXS<sub>3</sub> (X = Zr, Hf)-based perovskite solar cells.

Physical chemistry chemical physics : PCCP·2026
Same journal

Generalized Suzuki-Chin factorization in bosonic path integral molecular dynamics.

Physical chemistry chemical physics : PCCP·2026
See all related articles

Related Experiment Video

Updated: Jun 16, 2026

An Introduction to Processing, Fitting, and Interpreting Transient Absorption Data
08:12

An Introduction to Processing, Fitting, and Interpreting Transient Absorption Data

Published on: February 16, 2024

Chirp effects on impulsive vibrational spectroscopy: a multimode perspective.

Amir Wand1, Shimshon Kallush, Ofir Shoshanim

  • 1Institute of Chemistry and The Farkas Center for Light-Induced Processes, The Hebrew University, Jerusalem 91904, Israel.

Physical Chemistry Chemical Physics : PCCP
|February 19, 2010
PubMed
Summary
This summary is machine-generated.

Negatively-chirped laser pulses enhance Raman scattering by "following" molecular vibrations. This study explores optimal chirp effects in complex molecules and solutions, revealing dependencies on molecular structure and environment.

More Related Videos

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
12:21

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
08:49

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy

Published on: December 1, 2023

Related Experiment Videos

Last Updated: Jun 16, 2026

An Introduction to Processing, Fitting, and Interpreting Transient Absorption Data
08:12

An Introduction to Processing, Fitting, and Interpreting Transient Absorption Data

Published on: February 16, 2024

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
12:21

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
08:49

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy

Published on: December 1, 2023

Area of Science:

  • Physical Chemistry
  • Ultrafast Spectroscopy
  • Molecular Dynamics

Background:

  • Negatively-chirped pulses are known to enhance resonant impulsive Raman scattering.
  • This enhancement is attributed to a pump-dump mechanism that manipulates excited molecular states.
  • Understanding this effect in complex molecules with multiple vibrational modes and in condensed phases is crucial.

Purpose of the Study:

  • To extend the understanding of chirped pulse effects to polyatomic molecules with multiple displaced vibrational modes in solution.
  • To define an optimally chirped pulse for vibrational coherence manipulation.
  • To investigate the dependence of chirp effects on molecular properties and environmental factors.

Main Methods:

  • Experimental investigation using chirped pump-impulsive probe spectroscopy with <10 fs resolution.
  • Studies conducted on Sulforhodamine-B, Betaine-30, and Oxazine-1 in ethanol solutions.
  • Theoretical analysis using numerical simulations incorporating multiple displaced modes and electronic dephasing.

Main Results:

  • Group velocity dispersion (GVD) effects on wave-packet buildup depend on pulse spectrum, vibrational displacements, detuning, and dephasing rates.
  • In the small-displacement regime, optimal GVD is mode-specific; highly-displaced modes require multi-dimensional analysis.
  • Ultrafast dephasing and photochemistry reduce the optimal chirp window, leading to similar optimal chirp values for different modes.

Conclusions:

  • The study semi-quantitatively reproduces experimental results, highlighting the complex interplay of factors influencing chirped pulse dynamics.
  • Optimal chirp is highly dependent on the specific molecule and its vibrational landscape, especially in the presence of environmental interactions.
  • Predictions are made for non-intuitive coherent effects in specific regimes, warranting further experimental verification.