Our Direct Ion Detection Technology Project is wrapping up in its current form, with a plan to reemerge – bigger and better – next year. See this PDF for a summary of the project to date, and plans for future work. Further details can also be found on the project webpages.
Talk originally given as a 20min presentation at PQE 2018 (Snowbird, Utah, http://pqeconference.com/pqe2018/program). The original talk was not recorded; this is an extended version using the same slides, but with rather more introductory discussion. The abstract is given below, along with links to additional material.
More details of the work discussed in the main part of the talk can be found in:
Molecular Frame Reconstruction Using Time-Domain Photoionization Interferometry.
Marceau et. al., Physical Review Letters, 119(8), 83401 (2017).
- arXiv 1701.08432 (https://arxiv.org/abs/1701.08432).
- Full docs, data & code repository: https://dx.doi.org/10.6084/m9.figshare.4480349
- Slides: https://doi.org/10.6084/m9.figshare.5645509
- For further info on the upcoming book Quantum Metrology with Photoelectrons: https://osf.io/q2v3g/
- For those curious about the term bootstrapping, see Wikipedia
PQE 2018 Abstract
Bootstrapping (Ultrafast) Photoionization Dynamics
Slot: Tuesday Morning Invited Session 1
Session: Ultrafast photoionization dynamics
Photoionization is an interferometric process, in which multiple paths can contribute to the final continuum photoelectron state. At the simplest level, interferences between different final angular momentum states are clearly manifest in the energy and angle resolved photoelectron spectra; metrology schemes making use of these interferograms are thus phase-sensitive, and provide a powerful route to detailed understanding of photoionization.
The high information content of angle-resolved interferograms, combined with geometric control over the photoionization dynamics, can provide sufficient data for reconstruction of the continuum state, in terms of the constituent partial waves and phases. This has recently been explored for a range of cases, including the use of ultrafast pump-probe schemes with a bootstrapping analysis methodology: aspects of this work will be presented.
Molecular Frame Reconstruction Using Time-Domain Photoionization Interferometry
Marceau, C., Makhija, V., Platzer, D., Naumov, A. Y., Corkum, P. B., Stolow, A., Villeneuve, D. M., Hockett, P. (2017). Physical Review Letters, 119(8), 83401. http://doi.org/10.1103/PhysRevLett.119.083401
Coherent control of photoelectron wavepacket angular interferograms.
Hockett, P., Wollenhaupt, M., & Baumert, T. (2015). Journal of Physics B: Atomic, Molecular and Optical Physics, 48(21), 214004. http://doi.org/10.1088/0953-4075/48/21/214004
Complete Photoionization Experiments via Ultrafast Coherent Control with Polarization Multiplexing.
Hockett, P., Wollenhaupt, M., Lux, C., & Baumert, T. (2014). Physical Review Letters, 112(22), 223001. http://doi.org/10.1103/PhysRevLett.112.223001
Coherent imaging of an attosecond electron wave packet.
Villeneuve, D. M., Hockett, P., Vrakking, M. J. J., & Niikura, H. (2017). Science, 356(6343), 1150–1153. http://doi.org/10.1126/science.aam8393
Slides for Paul’s DAMOP talk are now available on figshare (DOI: 10.6084/m9.figshare.5049142).
Photoionization is an interferometric process, in which multiple paths can contribute to the final continuum photoelectron state. At the simplest level, interferences between different final angular momentum states are manifest in the energy and angle resolved photoelectron spectra: metrology schemes making use of these interferograms are thus phase-sensitive, and provide a powerful route to detailed understanding of photoionization . At a more complex level, such measurements can also provide a powerful probe for other processes of interest, for example: (a) dynamical process in time-resolved measurements, such as rotational, vibrational and electronic wavepackets, and (b) in order to understand and develop control schemes . In this talk recent work in this vein will be discussed, touching on “complete” photoionization studies of atoms and molecules with shaped laser pulses [1,2] and XUV , metrology schemes using Angle-Resolved RABBIT, and molecular photoionization dynamics in the time-domain (Wigner delays) .
 Hockett, P. et. al. (2015). Phys. Rev. A, 92, 13412.  Hockett, P. et. al. (2014). Phys. Rev. Lett., 112, 223001.  Marceau, C. et. al. (2017). Submitted. DOI: 10.6084/m9.figshare.4480349.  Hockett, P. et. al. (2016). J. Phys B, 49, 95602.
Update 29th June 2017 – a video of the talk is now also available.
A perennial issue with research – it is usually impractical to publish everything. This could be viewed as a good thing, if one assumes that the outcome is that only the cream of research is published and makes it to the wider world. However, more often it’s absolutely not a good thing, but the result of a range of factors which impede research – for instance, there is too much material to include in formal journal articles, the work is finished but never written up formally, the work is shelved, the work becomes background for other work but remains unpublished, the work gets lost in publication or multi-author limbo… etc. etc.
These days, there’s no excuse: a range of platforms exist for sharing work at any stage of completion, from project plans to completed manuscripts, from data to code, from brief notes to full dissertations. Figshare is one useful platform, since it provides a DOI for all public material, enabling any materials uploaded to be catalogued and cited in the usual way.
In this spirit, we’ve just uploaded some old presentations, in the area of ultrafast light-matter interactions, and this collection will continue to grow. Enjoy!