Andrew Brown

Source: https://pure.qub.ac.uk/en/persons/andrew-brown/ Parent: https://www.qub.ac.uk/courses/undergraduate/applied-mathematics-physics-bsc-gf13/

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Andrew Brown

https://orcid.org/0000-0001-5652-1495

Emailandrew.brown@qub.ac.uk
Room 01.005 - Old Physics

United Kingdom

Accepting PhD Students

2012Research output 2012: 4Research output 2013: 1Research output 2014: 2Research output 2015: 3Research output 2016: 4Projects 2017: 2Research output 2017: 1Research output 2018: 3Projects 2019: 1Research output 2019: 5Research output 2020: 9Research output 2021: 1Research output 2022: 3Research output 2023: 4Research output 2025: 6Research output 2026: 12026

Research activity per year

Personal profile

Research Interests

Advances in laser technology have facilitated the experimental analysis of atomic structure and electron dynamics in unprecedented detail. Typically, now, we are interested in dynamics which occur on the attosecond scale (1 as = 10-18 s), which is the fundamental time scale of electronic motion in the atom. These dynamics underpin macroscopic processes such as photosynthesis and chemical reactions more generally.

Theoretical methods capable of describing attosecond scale electronic motion typically adopt a classical approach where an electron is driven by a laser field in the net potential of the residual ion. However, the RMT (R-Matrix with Time) method pioneered at QUB allows us to address the interaction of all the electrons in an atomic system. It is these multielectron interactions which mediate ultrafast dynamics and thus it is imperative to address them accurately.

For the last ten years my research has focused on extracting experimental observables from the detailed ab-initio calculations performed with RMT. To this end I have investigated several cutting-edge experimental schemes using the RMT approach, including attosecond transient absorption spectroscopy, strong-field rescattering, XUV initiated high harmonic generation and photoelectron spectroscopy.

Recently my work has been addressed at developing the software tools used for this research. Historically, the scientific computing community has focused on delivering immediate scientific insight, oftentimes at the expense of sustainable development. This has resulted in software that is disjointed, difficult to use, and ultimately unsustainable. With the award of my recent EPSRC Research Software Engineering fellowship I am hoping to address these issues and ensure that the incredible software developed by my colleagues delivers scientific impact for decades to come.

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Collaborations and top research areas from the last five years

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Projects

1 Active
2 Finished
R1066TCP: UK Atomic, Molecular and Optical physics R-matrix consortium (UK AMOR)

Brown, A. (PI)

18/06/2019 → …

Project: Research

Time
Atom
Photoionization
Electron Particle
Electrons
R1728TCP: R-matrix Suites for Multielectron Attosecond Dynamics in Atoms and Molecules Irradiated by Arbitrarily Polarised Light

Van Der Hart, H. (PI) & Brown, A. (CoI)

08/05/2017 → 28/02/2020

Project: Research

Time
Electron Particle
Photoionization
Electrons
Procedure
R1725TCP: ARMouReD: Atomic R-matrix Method for Relativistic Dynamics

Van Der Hart, H. (PI), Ballance, C. (CoI) & Brown, A. (CoI)

08/02/2017 → 31/07/2020

Project: Research

Time
Electron Particle
Atom
Molecule
Schrodinger Equation

Research output

31 Article
3 Meeting abstract
2 Conference contribution
2 Comment/debate
5 More
2 Letter
1 Abstract
1 Poster
1 Editorial
1 Software
Using Möbius for automated assessment in mathematics: a case study

Tribello, G. A., Grüning, M., Brown, A., Barnes, D., Dore, T. & Keys, P. H., 08 Jan 2026, (Early online date) In: Teaching Mathematics and Its Applications. 22 p., hraf020.

Research output: Contribution to journal › Article › peer-review

Open Access

File

Student Engagement
Assessment Activity
Case Study
Failure Rate

10 Downloads (Pure) - ### Heterodyne analysis of high-order partial waves in attosecond photoionization of Helium

Jiang, W., Roantree, L., Han, L., Ji, J., Xu, Y., Zuo, Z., Wörner, H. J., Ueda, K., Brown, A., Van Der Hart, H., Gong, X. & Wu, J., 03 Jan 2025, In: Nature Communications. 16, 381.

Research output: Contribution to journal › Article › peer-review

Open Access

File

Photoionization
Angular Distribution
Photoelectron
Rydberg State
Anisotropy

6 Citations (Scopus)

34 Downloads (Pure) - ### Impact of electron correlation on photoelectron angular distributions in sequential double photoionization of Ne+

Lavery, H., Brown, A. C. & van der Hart, H. W., 01 Dec 2025, In: Physical Review A. 112, 6, 11 p., 063102 .

Research output: Contribution to journal › Article › peer-review

Open Access

File

Free Electron

5 Downloads (Pure) - ### Phase evolution of strong-field ionization

Hutcheson, L., Hartmann, M., Borisova, G., Birk, P., Hu, S., Ott, C., Pfeifer, T., Van Der Hart, H. & Brown, A., 07 Jul 2025.

Research output: Contribution to conference › Poster

File

Field Ionization
Xenon
Absorption Spectroscopy
Time Dependence
Excited State
Phase evolution of strong-field ionization

Hutcheson, L., Hartmann, M., Borisova, G. D., Birk, P., Hu, S., Ott, C., Pfeifer, T., van der Hart, H. W. & Brown, A. C., 24 Jun 2025, In: Physical Review Research. 7, 2, 6 p., L022074.

Research output: Contribution to journal › Article › peer-review

Open Access

File

Delay Time
Shape Parameter
Complex Plane
Phase Shift
Excited State

12 Downloads (Pure)

View all 47 research outputs

Datasets

Dataset for "RABBITT-HOP: Reconstruction of Attosecond Beating By Interference of Two-photon Transitions with Higher-Order Processes"

Brown, A. (Creator), Queen's University Belfast, 19 Jun 2025

DOI: 10.17034/67b30434-7abe-41ea-83da-1247b34e4a33

Dataset

File - ### Intensity Averaging Data for Stimulating electron competition with extreme-ultraviolet-initiated high-order harmonic generation

Hutcheson, L. (Creator) & Brown, A. (Supervisor), Queen's University Belfast, 28 Nov 2023

DOI: 10.17034/adbed237-750d-4c9c-95a4-1b19f5b8fc6d

Dataset

File - ### Dataset for "Enhancing spin polarization using ultrafast angular streaking"

Armstrong, G. (Creator), Clarke, D. (Contributor), Wragg, J. (Contributor), Benda, J. (Contributor), Brown, A. (Contributor) & Van Der Hart, H. (Contributor), Queen's University Belfast, 30 Apr 2021

DOI: 10.17034/9f15c023-22e3-4a3e-abdc-a20aa09edd75

Dataset

File - ### Electron correlation and short-range dynamics in attosecond angular streaking in the Fluorine anion

Armstrong, G. (Creator), Brown, A. (Creator), Wragg, J. (Creator), Clarke, D. (Creator) & Van Der Hart, H. (Creator), Queen's University Belfast, 10 Apr 2020

DOI: 10.17034/dc24280a-ac0a-4815-908b-a03a9cea1df0

Dataset

File - ### Rotational asymmetry in photodetachment from F- in circularly polarised laser fields

Armstrong, G. (Creator), Clarke, D. (Creator), Brown, A. (Creator) & Van Der Hart, H. (Creator), Queen's University Belfast, 06 Feb 2019

DOI: 10.17034/f087c320-7579-4942-a95f-f7cd66d6a0c2

Dataset

File

View all 17 datasets