M. Brouard
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View article: Multimass Three-Dimensional Velocity Map Imaging from Surfaces
Multimass Three-Dimensional Velocity Map Imaging from Surfaces Open
This paper presents a surface scattering study employing a multimass ion imaging method, in which the sample is mounted on the repeller plate of the ion optical system and ions generated at the surface are velocity mapped along the surface…
View article: Wavelength-dependent photodissociation of iodomethylbutane
Wavelength-dependent photodissociation of iodomethylbutane Open
Ultrashort XUV pulses of the Free-Electron-LASer in Hamburg (FLASH) were used to investigate laser-induced fragmentation patterns of the prototypical chiral molecule 1-iodo-2-methyl-butane ( $$\hbox {C}_5$$ $$\hbox {H}_{11}$$ I) in a pump-…
View article: Wavelength-Dependent Photodissociation of Iodomethylbutane
Wavelength-Dependent Photodissociation of Iodomethylbutane Open
Ultrashort XUV pulses of the Free-Electron-LASer in Hamburg (FLASH) were used to investigate laser-induced fragmentation patterns of the prototypical chiral molecule 1-iodo-2-methyl-butane (C$_5$H$_{11}$I) in a pump-probe scheme. Ion veloc…
View article: Distinguishing the XUV-induced Coulomb explosion dynamics of iodobenzene using covariance analysis
Distinguishing the XUV-induced Coulomb explosion dynamics of iodobenzene using covariance analysis Open
The primary and secondary fragmentation dynamics of iodobenzene following its ionization at 120 eV were determined using three-dimensional velocity map imaging and covariance analysis. Site-selective iodine 4d ionization was used to popula…
View article: Time-Resolved Probing of the Iodobenzene C-Band Using XUV-Induced Electron Transfer Dynamics
Time-Resolved Probing of the Iodobenzene C-Band Using XUV-Induced Electron Transfer Dynamics Open
Time-resolved extreme ultraviolet spectroscopy was used to investigate photodissociation within the iodobenzene C-band. The carbon-iodine bond of iodobenzene was photolyzed at 200 nm, and the ensuing dynamics were probed at 10.3 nm (120 eV…
View article: The Role of Momentum Partitioning in Covariance Ion Imaging Analysis
The Role of Momentum Partitioning in Covariance Ion Imaging Analysis Open
We present results from a covariance ion imaging study, which employs extensive filtering, on the relationship between fragment momenta to gain deeper insight into photofragmentation dynamics. A new data analysis approach is introduced tha…
View article: Ultrafast dynamics of fluorene initiated by highly intense laser fields
Ultrafast dynamics of fluorene initiated by highly intense laser fields Open
We present an investigation of the ultrafast dynamics of the polycyclic aromatic hydrocarbon fluorene initiated by an intense femtosecond near- infrared laser pulse (810 nm) and probed by a weak visible pulse (405 nm). Using a multichannel…
View article: Two-Dimensional Projected-Momentum Covariance Mapping for Coulomb Explosion Imaging
Two-Dimensional Projected-Momentum Covariance Mapping for Coulomb Explosion Imaging Open
We introduce projected-momentum covariance mapping, an extension of recoil-frame covariance mapping for 2D ion imaging studies. By considering the two-dimensional projection of the ion momenta as recorded by the detector, one opens the doo…
View article: Ultrafast dynamics of fluorene initiated by highly intense laser fields
Ultrafast dynamics of fluorene initiated by highly intense laser fields Open
We present an investigation of the ultrafast dynamics of the polycyclic aromatic hydrocarbon fluorene initiated by an intense femtosecond near- infrared laser pulse (810 nm) and probed by a weak visible pulse (405 nm). Using a multichannel…
View article: Exploring the ultrafast and isomer-dependent photodissociation of iodothiophenes <i>via</i> site-selective ionization
Exploring the ultrafast and isomer-dependent photodissociation of iodothiophenes <i>via</i> site-selective ionization Open
The dissociation dynamics of UV pumped iodothiophene molecules are investigated using velocity map ion imaging, in combination with site-selective extreme ultraviolet ionization of the iodine atom.
View article: Concluding remarks: Reflections on the <i>Faraday Discussion</i> on New Directions in Molecular Scattering
Concluding remarks: Reflections on the <i>Faraday Discussion</i> on New Directions in Molecular Scattering Open
These concluding remarks summarize the Faraday Discussion on New Directions in Molecular Scattering.
View article: Ultrafast dynamics of fluorene initiated by highly intense laser fields
Ultrafast dynamics of fluorene initiated by highly intense laser fields Open
We present an investigation of the ultrafast dynamics of the polycyclic aromatic hydrocarbon fluorene initiated by an intense femtosecond near-infrared laser pulse (810 nm) and probed by a weak visible pulse (405 nm).
View article: Direct momentum imaging of charge transfer following site-selective ionization
Direct momentum imaging of charge transfer following site-selective ionization Open
We study ultrafast charge rearrangement in dissociating 2-iodopropane (2-C3H7I) using site-selective core-ionization at the iodine atom. Clear signatures of electron transfer between the neutral propyl fragment and multiply charged iodine …
View article: Ultrafast dynamics of polycyclic aromatic hydrocarbons initiated by highly intense laser fields
Ultrafast dynamics of polycyclic aromatic hydrocarbons initiated by highly intense laser fields Open
We present an investigation of the ultrafast dynamics of the polycyclic aromatic hydrocarbon fluorene initiated by an intense femtosecond infrared laser pulse and probed by a weak visible pulse. Using a multichannel detection scheme (mass …
View article: Characterizing the multi-dimensional reaction dynamics of dihalomethanes using XUV-induced Coulomb explosion imaging
Characterizing the multi-dimensional reaction dynamics of dihalomethanes using XUV-induced Coulomb explosion imaging Open
Site-selective probing of iodine 4d orbitals at 13.1 nm was used to characterize the photolysis of CH2I2 and CH2BrI initiated at 202.5 nm. Time-dependent fragment ion momenta were recorded using Coulomb explosion imaging mass spectrometry …
View article: Time-Resolved X-ray Photoelectron Spectroscopy: Ultrafast Dynamics in CS<sub>2</sub>Probed at the S 2p Edge
Time-Resolved X-ray Photoelectron Spectroscopy: Ultrafast Dynamics in CS<sub>2</sub>Probed at the S 2p Edge Open
Recent developments in X-ray free-electron lasers have enabled a novel site-selective probe of coupled nuclear and electronic dynamics in photoexcited molecules, time-resolved X-ray photoelectron spectroscopy (TRXPS). We present results fr…
View article: Ion Microscope Imaging Mass Spectrometry Using a Timepix3-Based Optical Camera
Ion Microscope Imaging Mass Spectrometry Using a Timepix3-Based Optical Camera Open
Ion microscopy allows for high-throughput mass spectrometry imaging. In order to resolve congested mass spectra, a high degree of timing precision is required from the microscope detector. In this paper we present an ion microscope mass sp…
View article: Photoionization and Photofragmentation Dynamics of I<sub>2</sub> in Intense Laser Fields: A Velocity-Map Imaging Study
Photoionization and Photofragmentation Dynamics of I<sub>2</sub> in Intense Laser Fields: A Velocity-Map Imaging Study Open
The photoionization and photofragmentation dynamics of I2 in intense femtosecond near-infrared laser fields were studied using velocity-map imaging of cations, electrons, and anions. A series of photofragmentation pathways originating from…
View article: The Kinetic Energy of PAH Dication and Trication Dissociation Determined by Recoil-Frame Covariance Map Imaging
The Kinetic Energy of PAH Dication and Trication Dissociation Determined by Recoil-Frame Covariance Map Imaging Open
We investigated the dissociation of dications and trications of three polycyclic aromatic hydrocarbons (PAHs), fluorene, phenanthrene, and pyrene. PAHs are a family of molecules ubiquitous in space and involved in much of the chemistry of …
View article: Ultrafast probing of charge transfer dynamics with an XUV free-electron laser
Ultrafast probing of charge transfer dynamics with an XUV free-electron laser Open
We study charge transfer in dissociating molecules of 2-iodopropane (C3H7I) in a UV pump – XUV probe regime at the SACLA free-electron laser. Signatures of charge transfer from the recently dissociated iodine atom to the neutral propyl rad…
View article: Fragmentation Dynamics of Fluorene Explored Using Ultrafast XUV-Vis Pump-Probe Spectroscopy
Fragmentation Dynamics of Fluorene Explored Using Ultrafast XUV-Vis Pump-Probe Spectroscopy Open
We report on the use of extreme ultraviolet (XUV, 30.3 nm) radiation from the Free-electron LASer in Hamburg (FLASH) and visible (Vis, 405 nm) photons from an optical laser to investigate the relaxation and fragmentation dynamics of fluore…
View article: UV-induced dissociation of CH<sub>2</sub>BrI probed by intense femtosecond XUV pulses
UV-induced dissociation of CH<sub>2</sub>BrI probed by intense femtosecond XUV pulses Open
The ultraviolet (UV)-induced dissociation and photofragmentation of gas-phase CH 2 BrI molecules induced by intense femtosecond extreme ultraviolet (XUV) pulses at three different photon energies are studied by multi-mass ion imaging. Usin…
View article: The kinetic energy of PAH dication and trication dissociation determined by recoil-frame covariance map imaging
The kinetic energy of PAH dication and trication dissociation determined by recoil-frame covariance map imaging Open
The kinetic energy of dissociation of polycyclic aromatic hydrocarbons is determined by application of recoil-frame covariance imaging analysis to velocity map images.
View article: Disentangling sequential and concerted fragmentations of molecular polycations with covariant native frame analysis
Disentangling sequential and concerted fragmentations of molecular polycations with covariant native frame analysis Open
Using covariance analysis methods, we study the fragmentation dynamics of multiply ionized 1- and 2-iodopropane. Signatures of isomer-specific nuclear motion occurring during sequential fragmentation pathways are identified.