5k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR339 papers
- European Southern ObservatoryCL298 papers
- Center for Astrophysics Harvard & SmithsonianUS294 papers
- University of CambridgeGB274 papers
- Osservatorio Astronomico di PadovaIT271 papers
- University of WarwickGB256 papers
- Stockholm UniversitySE237 papers
- Max Planck Institute for AstrophysicsDE213 papers
- Las Cumbres Observatory Global Telescope NetworkUS211 papers
- AlbaNovaSE210 papers
- Space Telescope Science InstituteUS208 papers
- University of St AndrewsGB193 papers
157 papers · 1 filter
Dissociative positronium attachment in halogen gases
R. S. Wilde, G. F. Gribakin, I. I. Fabrikant
We suggest that the observed large annihilation rates of ortho-positronium (-Ps) in halogen gases are due to the process of dissociative Ps attachment, ${\rm Ps} + X_2 \to {\rm…
Phase evolution of strong-field ionization
Lynda R Hutcheson, Maximilian Hartmann, Gergana D Borisova +6
We investigate the time-dependent evolution of the dipole phase shift induced by strong-field ionization (SFI) using attosecond transient absorption spectroscopy (ATAS) for time-de…
L-shell Photoionisation Cross Sections in the S^{+}, S^{2+}, S^{3+} Isonuclear Sequence
J. -P. Mosnier, E. T. Kennedy, D. Cubaynes +6
We present absolute L-shell photoionisation cross sections for the S+, S2+, S3+ions. The cross sections were obtained using the monochromatised photon beam delivered by the SOLEIL…
Luminosity predictions for the first three ionisation stages of W, Pt and Au to probe potential sources of emission in kilonova
M. McCann, L. P. Mulholland, Z. Xiong +7
A large number of R-matrix calculations of electron impact excitation for heavy elements (Z > 70) have been performed in recent years for applications in fusion and astrophysics re…
Many-Body Theory Calculations of Positron Scattering and Annihilation in H, N and CH
C. M. Rawlins, J. Hofierka, B. Cunningham +2
The recently developed ab initio many-body theory of positron molecule binding [J. Hofierka et al., Nature, 606, 688 (2022)] is combined with the shifted pseudostates method [A. R.…
Enhancing spin polarization using ultrafast angular streaking
Gregory S. J. Armstrong, Daniel D. A. Clarke, Jakub Benda +3
Through solution of the multielectron, semi-relativistic, time-dependent Schrödinger equation, we show that angular streaking produces strongly spin-polarized electrons in a noble…
B-Spline basis Hartree-Fock method for arbitrary central potentials: atoms, clusters and electron gas
D. T. Waide, D. G. Green, G. F. Gribakin
An implementation of the Hartree-Fock (HF) method capable of robust convergence for well-behaved arbitrary central potentials is presented. The Hartree-Fock equations are converted…
Positron cooling via inelastic collisions in CF and N gases
A. R. Swann, D. G. Green
Positron cooling via inelastic collisions in CF and N gases is simulated, including positron-positron interactions. Owing to the molecular symmetries, cooling is assumed to…
Many-body theory for positronium scattering and pickoff annihilation in noble-gas atoms
A. R. Swann, D. G. Green, G. F. Gribakin
The many-body-theory approach to positronium-atom interactions developed in [Phys. Rev. Lett. \textbf{120}, 183402 (2018)] is applied to the sequence of noble-gas atoms He-Xe. The…
Many-body theory of positron binding in polyatomic molecules
J. Hofierka, B. Cunningham, C. M. Rawlins +2
Positrons bind to molecules leading to vibrational excitation and spectacularly enhanced annihilation. Whilst positron binding energies have been measured via resonant annihilation…
Effect of chlorination on positron binding to hydrocarbons: experiment and theory
A. R. Swann, G. F. Gribakin, J. R. Danielson +3
Measured and calculated positron binding energies are presented for a range of hydrocarbons with up to six carbon atoms (viz., methane, acetylene, ethylene, ethane, propane, butane…
Electron Impact Excitation of O III: An Assessment
K M Aggarwal
Tayal and Zatsarinny [Astrophys. J. 850 (2017) 147] have reported results for energy levels, radiative rates (A-values), lifetimes, and effective collision strengths () for tran…
Manipulating Twisted Electrons in Strong-Field Ionization
A. S. Maxwell, G. S. J. Armstrong, M. F. Ciappina +5
We investigate the discrete orbital angular momentum (OAM) of photoelectrons freed in strongfield ionization. We use these `twisted' electrons to provide an alternative interpretat…
Effect of molecular constitution and conformation on positron binding and annihilation in alkanes
A. R. Swann, G. F. Gribakin
The model-potential approach previously developed by the authors to study positron interactions with molecules is used to calculate the positron binding energy for -alkanes (C$_…
Polarization control of high-harmonic generation via the spin-orbit interaction
Jack Wragg, Daniel D. A. Clarke, Gregory S. J. Armstrong +3
We observe the generation of high harmonics in the plane perpendicular to the driving laser polarization and show that these are driven by the spin-orbit interaction. Using R-Matri…
Opacity modelling of heavy-metal hot subdwarfs. Photoionization of Sr, Y and Zr
L. Fernández-Menchero, C. S. Jeffery, C. A. Ramsbottom +1
Heavy-metal hot subdwarfs (sdB and sdO) represent a small group of stars with unusually high concentrations of trans-iron elements in their atmospheres, having abundances ~ 10000 t…
Electron correlation and short-range dynamics in attosecond angular streaking
G. S. J. Armstrong, D. D. A. Clarke, J. Benda +2
We employ the R-matrix with time-dependence method to study attosecond angular streaking of F. Using this negative ion, free of long-range Coulomb interactions, we elucidate th…
Model-potential calculations of positron binding, scattering, and annihilation for atoms and small molecules, using a Gaussian basis
A. R. Swann, G. F. Gribakin
A model-potential method is employed to calculate binding, elastic scattering, and annihilation of positrons for a number of atoms and small nonpolar molecules, namely, Be, Mg, He,…
Comment on "Energy levels, oscillator strengths, and transition probabilities for sulfur-like scandium, Sc~VI" by El-Maaref et al.\, [Indian J. Phys. {\bf 91} 1029 (2017)]
K M Aggarwal
In this comment, through our independent calculations, we assess that the recently reported results of El-Maaref et al. [{\em Indian J. Phys.} {\bf 91} 1029 (2017)] for energy leve…
Modeling tomographic measurements of photoelectron vortices in counter-rotating circularly polarized laser pulses
G. S. J. Armstrong, D. D. A. Clarke, J. Benda +3
Recent experiments [D. Pengel, S. Kerbstadt, L. Englert, T. Bayer, and M. Wollenhaupt, \href{https://journals.aps.org/pra/abstract/10.1103/PhysRevA.96.043426}{{\PRA} {\bf 96} 04342…
Radiative association of atomic and ionic carbon
James F. Babb, R. T. Smyth, B. M. McLaughlin
We present calculated cross sections and rate coefficients for the formation of the dicarbon cation (C) by the radiative association process in collisions of a C atom…
Photoionization of tungsten ions: experiment and theory for W
A Müller, S Schippers, J Hellhund +3
Experimental and theoretical cross sections are reported for single-photon single ionization of W ions. Absolute measurements were conducted employing the photon-ion merged-…
Energy levels and radiative rates for transitions in S-like Sc~VI, V VIII, Cr IX, and Mn~X
Kanti Aggarwal
Energy levels, radiative rates and lifetimes are reported for four S-like ions, namely Sc~VI, V VIII, Cr IX, and Mn~X. Two independent atomic structure codes, namely the general-pu…
Comment on "Configuration interaction calculations and excitation rates of X-ray and EUV transitions in sulfurlike manganese" by El-Maaref et al. [J. Elect. Spectrosc. Related Phen. 215 (2017) 22]
K M Aggarwal
In one of the papers, El-Maaref et al. [J. Elect. Spectrosc. Related Phen. 215 (2017) 22] have reported results for energy levels, oscillator strengths (f-values), radiative rates…