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Marcel Drabbels

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Related publications (53)

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Mid-Infrared Spectroscopy of Molecular Ions in Helium Nanodroplets

Marcel Drabbels, Xiaohang Zhang, Nils Benedict Brauer

High resolution IR spectra of aniline, styrene and 1,1-diphenylethylene cations embedded in superfluid helium nanodroplets have been recorded in the 300-1700 cm-1 range using the free-electron laser FELIX as radiation source. Comparison of the spectra with ...

American Institute of Physics2012

High-resolution excitation and absorption spectroscopy of gas-phase p-coumaric acid: unveiling an elusive chromophore

Marcel Drabbels

We report on the first successful high-resolution spectroscopic studies on isolated para-coumaric acid, the chromophore of the photoactive yellow protein which has become a model system for studying biological light induced signal transduction. Employing v ...

American Chemical Society2010

Accurate time zero determination in an ultrafast transmission electron microscope without energy filter

Marcel Drabbels, Ulrich Lorenz, Pavel Olshin, Jonathan Mark Voss

In this manuscript, we describe a simple and accurate method for finding the temporal overlap of the laser pump and electron probe pulse in ultrafast TEM. Our approach is based on the observation that the outline of a nanoparticle blurs at time zero, a phe ...

AIP American Institute of Physics2022

Near-atomic resolution reconstructions from in situ revitrified cryo samples

Marcel Drabbels, Ulrich Lorenz, Gabriele Bongiovanni, Jonathan Mark Voss, Oliver Florian Harder

A microsecond time-resolved version of cryo-electron microscopy (cryo-EM) has recently been introduced to enable observation of the fast conformational motions of proteins. The technique involves locally melting a cryo sample with a laser beam to allow the ...

2023

Electronic Spectroscopy of Aniline Ions Embedded in Helium Nanodroplets

Marcel Drabbels, Xiaohang Zhang, Nils Benedict Brauer

Excitation spectra of the and transitions of aniline cations embedded in helium nanodroplets are reported. The spectra are characterized by broad asymmetric resonances that consist of an intrinsically broadened zero-phonon line which partially overlaps wit ...

2011

Photodissociation of Alkyl Iodides in Helium Nanodroplets III: Recombination

Marcel Drabbels, Andreas Braun

The recombination of fragments resulting from the photodissociation of (fluorinated) alkyl iodides in helium nanodroplets at a wavelength of 266 nm has been investigated by means of ion imaging techniques. It is found that in the case of CH3I an appreciabl ...

2007

IR spectroscopy of molecular ions by nonthermal ion ejection from helium nanodroplets

Marcel Drabbels, Nils Benedict Brauer

Infrared spectroscopy provides a means to determine the intrinsic geometrical structures of molecules. Here we present a novel spectroscopic method that uses superfluid helium nanodroplets to record IR spectra of cold molecular ions, in this particular cas ...

American Chemical Society2010

Intense microsecond electron pulses from a Schottky emitter

Marcel Drabbels, Ulrich Lorenz, Pavel Olshin, Gabriele Bongiovanni

Thanks to their high brightness, field emitters are the electron sources of choice in most high-end electron microscopes. Under typical operating conditions, the available emission current from these emitters is largely limited by practical considerations, ...

AIP American Institute of Physics2020

Picosecond solvation dynamics of alkali cations in superfluid 4He nanodroplets

Marcel Drabbels, Alberto Hernando de Castro

The dynamics following the photoionization of neutral Rb and Cs atoms residing in a dimple at the surface of a superfluid 4He1000 nanodroplet has been investigated within time-dependent density functional theory, complementing a previous study on Ba. The c ...

American Physical Society2014

Time-resolved formation of excited atomic and molecular states in XUV-induced nanoplasmas in ammonia clusters

Marcel Drabbels, Andrew Daniel Bonnar Clark, Verónica Oliver Álvarez de Lara

High intensity XUV radiation from a free-electron laser (FEL) was used to create a nanoplasma inside ammonia clusters with the intent of studying the resulting electron-ion interactions and their interplay with plasma evolution. In a plasma-like state, ele ...

ROYAL SOC CHEMISTRY2020

Rapid melting and revitrification as an approach to microsecond time-resolved cryo-electron microscopy

Marcel Drabbels, Ulrich Lorenz, Pavel Olshin, Jonathan Mark Voss, Oliver Florian Harder

Proteins typically undergo dynamics on the microsecond to millisecond timescale, which is much faster than the time resolution of cryo-electron microscopy. Here, we propose a novel approach for microsecond time-resolved cryo-electron microscopy that involv ...

Elsevier2021

Harmonium: An Ultrafast Vacuum Ultraviolet Facility

Majed Chergui, Marco Grioni, Marcel Drabbels, Frank van Mourik, Alberto Crepaldi, Christopher Alexander Arrell, Gianmarco Gatti, Andrew Daniel Bonnar Clark, José Javier Pancracio Ojeda Andara, Luca Longetti, Silvan Dino Marcos Roth

Harmonium is a vacuum ultraviolet (VUV) photon source built within the Lausanne Centre for Ultrafast Science (LACUS). Utilising high harmonic generation, photons from 20-110 eV are available to conduct steady-state or ultrafast photoelectron and photoion s ...

Swiss Chemical Soc2017

Nucleation of quantized vortex rings in 4He nanodroplets

Marcel Drabbels, Xiaohang Zhang

Whereas most of the phenomena associated with superfluidity have been observed in finite-size helium systems, the nucleation of quantized vortices has proven elusive. Here we show that the solvation of a Ba+ ion created by photoionization of neutral Ba at ...

American Institute of Physics2014

Migration of surface excitations in highly-excited nanosystems probed by intense resonant XUV radiation

Marcel Drabbels

Ionization dynamics of resonantly excited helium nanodroplets have been studied by intense XUV light. By doping the nanodroplets with atoms that either attach to the surface or submerge into the center of the droplet, one can study the dynamics of excitati ...

2015

Barium Ions and Helium Nanodroplets: Solvation and Desolvation

Marcel Drabbels, Xiaohang Zhang

The solvation of Ba+ ions created by the photoionization of barium atoms located on the surface of helium nanodroplets has been investigated. The excitation spectra corresponding to the 6p 2P1/2

American Institute of Physics2012

Translational dynamics of photoexcited atoms in 4He nanodroplets: the case of silver

Alberto Hernando de Castro, Marcel Drabbels, Evgeniy Loginov

The dynamics following the photoexcitation of Ag atoms in 4He nanodroplets via the 5p 2P1=2 ← 5s2S1=2 and 5p 2P3=2 ← 5s2S1=2 transitions has been investigated in a joint experimental and theoretical effort. It has been experimentally found that upon excita ...

Royal Soc Chemistry2013

Photodissociation of Alkyl Iodides in Helium Nanodroplets I: Kinetic Energy Transfer

Marcel Drabbels, Andreas Braun

The photodissociation of (fluorinated) alkyl iodides in helium nanodroplets at a wavelength of 266 nm has been investigated by means of ion imaging techniques. It is found that a significant fraction of the created fragments escapes from the helium droplet ...

2007

Microsecond melting and revitrification of cryo samples with a correlative light-electron microscopy approach

Marcel Drabbels, Gabriele Bongiovanni, Oliver Florian Harder

We have recently introduced a novel approach to time-resolved cryo-electron microscopy (cryo-EM) that affords microsecond time resolution. It involves melting a cryo sample with a laser beam to allow dynamics of the embedded particles to occur. Once the la ...

2022

Fast viral dynamics revealed by microsecond time-resolved cryo-EM

Marcel Drabbels, Ulrich Lorenz, Oliver Florian Harder, Sarah Victoria Barrass

Observing proteins as they perform their tasks has largely remained elusive, which has left our understanding of protein function fundamentally incom- plete. To enable such observations, we have recently proposed a technique that improves the time resoluti ...

Nature Research2023

Photodissociation of Alkyl Iodides in Helium Nanodroplets II: Solvation Dynamics

Marcel Drabbels, Andreas Braun

The solvation dynamics of non-thermal species in liquid helium has been investigated by photolyzing alkyl iodide molecules, CH3I, C2H5I and CF3I, embedded in helium nanodroplets. The iodine and CH3 fragments are found to leave the droplets solvated by a fi ...

2007