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Christoph Bostedt

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Related publications (43)

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Attosecond transient absorption spooktroscopy: a ghost imaging approach to ultrafast absorption spectroscopy

Jonas Knurr, Christoph Bostedt, Andre Al Haddad, Zhaoheng Guo

The recent demonstration of isolated attosecond pulses from an X-ray free-electron laser (XFEL) opens the possibility for probing ultrafast electron dynamics at X-ray wavelengths. An established experimental method for probing ultrafast dynamics is X-ray t ...

ROYAL SOC CHEMISTRY2020

Multispectroscopic Study of Single Xe Clusters Using XFEL Pulses

Christoph Bostedt

X-ray free-electron lasers (XFELs) deliver ultrashort coherent laser pulses in the X-ray spectral regime, enabling novel investigations into the structure of individual nanoscale samples. In this work, we demonstrate how single-shot small-angle X-ray scatt ...

2019

A multi-reservoir extruder for time-resolved serial protein crystallography and compound screening at X-ray free-electron lasers

Christoph Bostedt, Camila Bacellar Cases Da Silveira

Serial crystallography at X-ray free-electron lasers (XFELs) permits the determination of radiation-damage free static as well as time-resolved protein structures at room temperature. Efficient sample delivery is a key factor for such experiments. Here, we ...

Nature Portfolio2023

Probing ultrafast pi pi/n pi internal conversion in organic chromophores via K-edge resonant absorption

Siyuan Wang, Christoph Bostedt, Jakob Grilj

Many photoinduced processes including photosynthesis and human vision happen in organic molecules and involve coupled femtosecond dynamics of nuclei and electrons. Organic molecules with heteroatoms often possess an important excited-state relaxation chann ...

Nature Publishing Group2017

Observation of site-selective chemical bond changes via ultrafast chemical shifts

Christoph Bostedt, Solène Oberli

X-ray photoelectron spectroscopy probes the chemical environment in a molecule at a specific atomic site. Here the authors extend this concept with a site selective trigger to follow chemical bond changes as they occur on the femtosecond time scale. ...

Nature Portfolio2022

Attosecond coherent electron motion in Auger-Meitner decay

Christoph Bostedt

In quantum systems, coherent superpositions of electronic states evolve on ultrafast time scales (few femtoseconds to attoseconds; 1 attosecond = 0.001 femtoseconds = 10(-18) seconds), leading to a time-dependent charge density. Here we performed time-reso ...

American Association for the Advancement of Science2022

Sizes of pure and doped helium droplets from single shot x-ray imaging

Christoph Bostedt

Advancements in x-ray free-electron lasers on producing ultrashort, ultrabright, and coherent x-ray pulses enable single-shot imaging of fragile nanostructures, such as superfluid helium droplets. This imaging technique gives unique access to the sizes and ...

AIP Publishing2022

Refinement for single-nanoparticle structure determination from low-quality single-shot coherent diffraction data

Christoph Bostedt

With the emergence of X-ray free-electron lasers, it is possible to investigate the structure of nanoscale samples by employing coherent diffractive imaging in the X-ray spectral regime. In this work, we developed a refinement method for structure reconstr ...

INT UNION CRYSTALLOGRAPHY2020

Auger-induced charge migration

Christoph Bostedt

Novel perspectives of controlling molecular systems have recently arisen from the possibility of generating attosecond pulses in the ultraviolet regime and tailoring electron dynamics in its natural time scale. The cornerstone mechanism is the so-called ch ...

2018

Correlation-Driven Transient Hole Dynamics Resolved in Space and Time in the Isopropanol Molecule

Christoph Bostedt, Andrew Daniel Bonnar Clark

The possibility of suddenly ionized molecules undergoing extremely fast electron hole (or hole) dynamics prior to significant structural change was first recognized more than 20 years ago and termed charge migration. The accurate probing of ultrafast elect ...

American Physical Society2021

Double diffraction imaging of x-ray induced structural dynamics in single free nanoparticles

Christoph Bostedt

Because of their high photon flux, x-ray free-electron lasers (FEL) allow to resolve the structure of individual nanoparticles via coherent diffractive imaging (CDI) within a single x-ray pulse. Since the inevitable rapid destruction of the sample limits t ...

IOP Publishing Ltd2024

Demonstration of full polarization control of soft X-ray pulses with Apple X undulators at SwissFEL using recoil ion momentum spectroscopy

Ningchen Yang, Christoph Bostedt, Jonas Knurr, Iwona Swiderska

The ability to freely control the polarization of X-rays enables measurement techniques relying on circular or linear dichroism, which have become indispensable tools for characterizing the properties of chiral molecules or magnetic structures. Therefore, ...

INT UNION CRYSTALLOGRAPHY2024

High intensity x-ray interaction with a model bio-molecule system: double-core-hole states and fragmentation of formamide

Yiming Li, Christoph Bostedt

Formamide, a simple model bio-molecule (HCONH2), is irradiated with high intensity, ultrashort pulses from an x-ray free electron laser. Ionic fragments resulting from photoionization and subsequent decay processes are recorded, as well as the electronic s ...

IOP Publishing2020

The SwissFEL soft X-ray free-electron laser beamline: Athos

Christoph Bostedt, Christopher Alexander Arrell, Rasmus Ischebeck, Eugenio Ferrari, Thomas Schmidt

The SwissFEL soft X-ray free-electron laser (FEL) beamline Athos will be ready for user operation in 2021. Its design includes a novel layout of alternating magnetic chicanes and short undulator segments. Together with the APPLE X architecture of undulator ...

2019

Characterizing crystalline defects in single Xe nanoparticles from angular correlations of single-shot diffracted X-rays

Yiming Li, Christoph Bostedt, Matthias Bucher

We performed a wide-angle X-ray scattering experiment of single Xe nanoparticles using an X-ray free electron laser. We developed a novel analysis method that focuses on the angular correlation between plural Bragg spots in single-shot diffraction patterns ...

IOP PUBLISHING LTD2020

Clocking Auger electrons

Christoph Bostedt

Intense X-ray free-electron lasers (XFELs) can rapidly excite matter, leaving it in inherently unstable states that decay on femtosecond timescales. The relaxation occurs primarily via Auger emission, so excited-state observations are constrained by Auger ...

2021

Ultrafast Single-particle Imaging with Intense X-ray Pulses

Christoph Bostedt

Ultrafast single-particle imaging with intense x-ray pulses from free-electron laser sources provides a new approach for visualizing structure and dynamics on the nanoscale. After a short introduction to the novel free-electron laser sources and methods, w ...

SWISS CHEMICAL SOC2022

Experimental demonstration of attosecond pump-probe spectroscopy with an X-ray free-electron laser

Christoph Bostedt, Jun Wang, Zhaoheng Guo

Pump-probe experiments with subfemtosecond resolution are the key to understanding electronic dynamics in quantum systems. Here we demonstrate the generation and control of subfemtosecond pulse pairs from a two-colour X-ray free-electron laser. By measurin ...

Nature Publishing Group2024

Widely tunable two-color x-ray free-electron laser pulses

Christoph Bostedt, Jonas Knurr

We demonstrate the generation of widely tunable two-color x-ray free-electron laser (FEL) pulses at Swiss-FEL. In a split-undulator configuration, each color is produced in a different undulator section, and a chicane between the two sections allows for a ...

AMER PHYSICAL SOC2022

SPRING, an effective and reliable framework for image reconstruction in single-particle Coherent Diffraction Imaging

Christoph Bostedt

Coherent Diffraction Imaging (CDI) is an experimental technique to image isolated structures by recording the scattered light. The sample density can be recovered from the scattered field through a Fourier Transform operation. However, the phase of the fie ...

2025