Attosecond Soft X-ray Spectroscopy of Condensed Phase Matter
Lead Research Organisation:
Imperial College London
Department Name: Physics
Abstract
The project will extend the technique of attosecond X-ray absorption spectroscopy to condensed phase materials. This will require further optimization of the required optical sources i.e. both the "pump" which are few-femtosecond long pulses in the visible to deep UV range, and the "probe" which are soft X-ray isolated attosecond pulses in the 100 - 500 eV photon energy range. For the former the research will focus on using non-linear optical methods to efficiently generate low order (up to 9th) of few-cycle pulses in the visible-NIR region. For the latter the present source, based on HHG of MIR few-cycle pulses in high density gas jets, will be enhanced by the use of optimized gas jet design and improved X-ray transmission through the beamline. With this capability we will measure exciton dynamics in organic polymers and organic oligomers in liquid phase to better understand fundamental issues of decoherence and transport of excitons in these materials. The role of polymer structure and morphology of the samples will be systematically explored. In this way not only will the research further the tools of ultrafast X-ray measurement, but may also contribute to the understanding of important materials in polymer opto-electronics that are currently used in solar energy harvesting research.
People |
ORCID iD |
Jonathan Marangos (Primary Supervisor) | |
Timur AVNI (Student) |
Publications
Johnson AS
(2019)
Attosecond soft X-ray high harmonic generation.
in Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
Studentship Projects
Project Reference | Relationship | Related To | Start | End | Student Name |
---|---|---|---|---|---|
EP/N509486/1 | 01/10/2016 | 31/03/2022 | |||
1994329 | Studentship | EP/N509486/1 | 01/10/2017 | 30/09/2021 | Timur AVNI |
Description | Development of 4-12 micron OPCPA and HHG work |
Organisation | University of Central Florida |
Country | United States |
Sector | Academic/University |
PI Contribution | Aided in the design and building of a 4-10 micron OPCPA. Modelling of HHG generated by a loose focussing geometry with a 1.7 um driving laser. |
Collaborator Contribution | Providing the initial design and continuing the building of the OPCPA. Generation of the HHG spectra with the 1.7 um driving laser. |
Impact | None thusfar. |
Start Year | 2019 |
Description | Fermi Beamtime for FERMI STIRAP Beamtime |
Organisation | Autonomous University of Madrid |
Country | Spain |
Sector | Academic/University |
PI Contribution | Computational processing of FEL data. |
Collaborator Contribution | Theoretical modelling of STIRAP dynamics anticipated in the experiment |
Impact | No outcomes thusfar. |
Start Year | 2018 |
Description | UV Source Development |
Organisation | Heriot-Watt University |
Country | United Kingdom |
Sector | Academic/University |
PI Contribution | Collaboration to help prepare UV sources for UV-Pump, X-Ray Probe experiments. |
Collaborator Contribution | Theoretical and experimental advice and for preparing a UV source. A visit to the group at the university to see how they prepare these sources. |
Impact | No outcomes thusfar. |
Start Year | 2019 |