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

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

893
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
893
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

351
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
351
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

359
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
359
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

1.5K
Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called collision-induced...
1.5K
Chemical Ionization (CI) Mass Spectrometry01:21

Chemical Ionization (CI) Mass Spectrometry

1.0K
The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
1.0K

You might also read

Related Articles

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

Sort by
Same author

Orbital-resolved imaging of coherent femtosecond exciton dynamics in coupled molecules.

Nature communications·2026
Same author

Entanglement and electronic coherence in attosecond molecular photoionization.

Nature·2026
Same author

Adsorption of organic donor-acceptor molecules on graphene/SiC preserves light-induced charge transfer.

Communications chemistry·2026
Same author

Accounting for Electronic Coherences Induced by Broadband Pulses by Using Pulse-Independent Trajectories.

Journal of chemical theory and computation·2026
Same author

Ultrafast proton transfer in a photoionized glycine by a mixed quantum-classical and quantum dynamics.

The Journal of chemical physics·2025
Same author

Modeling the Evolution of Laser-Induced Electronic Coherences with Trajectory Surface Hopping.

Journal of chemical theory and computation·2025

Related Experiment Video

Updated: Oct 18, 2025

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
08:51

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

Published on: August 18, 2017

10.5K

Selecting two-photon sequential ionization pathways in H2 through harmonic filtering.

Arturo Sopena1,2, Henri Bachau2, Fabrice Catoire2

  • 1Departamento de Química, Universidad Autónoma de Madrid, Módulo 13, 28049 Madrid, Spain.

Physical Chemistry Chemical Physics : PCCP
|October 5, 2021
PubMed
Summary

Attosecond pulse trains and IR lasers control molecular reactions. Filtering high harmonics in attosecond pulse trains allows precise manipulation of quantum pathways and electron emission direction in hydrogen molecules.

More Related Videos

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

9.8K
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

7.0K

Related Experiment Videos

Last Updated: Oct 18, 2025

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
08:51

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

Published on: August 18, 2017

10.5K
Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

9.8K
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

7.0K

Area of Science:

  • Physical Chemistry
  • Quantum Dynamics
  • Molecular Physics

Background:

  • Attosecond pulse trains (APTs) combined with femtosecond infrared (IR) pulses enable tracking and control of molecular excitation and ionization on attosecond timescales.
  • The interplay of electron and nuclear motion is crucial in light-induced molecular transitions, with inter-pulse time delay serving as a control parameter.
  • Understanding and controlling these dynamics are key to manipulating chemical reactions at the fundamental level.

Purpose of the Study:

  • To present *ab initio* simulations on the hydrogen molecule (H2) to demonstrate advanced control over photochemical reactions.
  • To show how filtering high harmonics in APTs can selectively quench or enhance specific quantum pathways.
  • To investigate the discrimination of sequential two-photon ionization processes and steer electron emission direction.

Main Methods:

  • Utilized *ab initio* quantum dynamics simulations for the hydrogen molecule.
  • Employed attosecond pulse trains (APTs) filtered by frequency.
  • Analyzed the effects of time delay and frequency filtering on excitation, ionization, and electron emission.

Main Results:

  • Demonstrated that filtering high harmonics in APTs can dictate reaction outcomes by controlling quantum paths.
  • Successfully discriminated between sequential two-photon ionization processes (excitation-ionization vs. ionization-excitation).
  • Showed that frequency filters can steer one- and two-photon yields to favor directional electron emission.

Conclusions:

  • Frequency filtering of APTs offers a powerful method to control quantum pathways in molecular dynamics.
  • This technique allows for precise manipulation of reaction outcomes and discrimination of ionization sequences.
  • The findings open new avenues for controlling electron emission directionality in molecular systems.