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Atoms, Volume 12, Issue 7

July 2024 - 4 articles

Cover Story: The single-center convergent close-coupling (CCC) method was utilized to obtain a comprehensive set of cross sections for positron scattering on atomic boron for energies between 10^₋₅ eV and 5000 eV. An accurate representation of the atomic structure was obtained, and excellent agreement was found with a previous experiment and the theory for excitation energies, oscillator strengths, and polarizabilities. To obtain positronium-formation and direct ionization cross sections, a model potential technique was used, together with the CCC method. From the current cross sections and previous CCC results for hydrogen and fluorine, the cross sections of positron scattering on BH, BF, BF₂, and BF₃ were obtained, with a modified independent atom approach. For all targets, good agreement with previous electron results was found at high energies. View this paper

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Article

1,284 Views

9 Pages

The Optical Model Absorption Term in the Frame of Fractional Derivatives

Ibrahim Ghabar,
Aliaa Burqan and
Gharib Gharib

Atoms2024, 12(7), 37;https://doi.org/10.3390/atoms12070037

10 July 2024

The complex optical model has been widely used to describe the elastic scattering of the nucleon–nucleus. The imaginary term of the optical potential takes into account the non-elastic scattering processes. This term was taken to be a Woods&nda...

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3 Citations

1,645 Views

19 Pages

Calculations of Positron Scattering from Boron, BH, BF, BF₂, and BF₃

Nicolas A. Mori,
Haadi Umer,
Liam H. Scarlett,
Igor Bray and
Dmitry V. Fursa

Atoms2024, 12(7), 36;https://doi.org/10.3390/atoms12070036

10 July 2024

The single-center convergent close-coupling (CCC) method is applied to calculate positron scattering from boron. A model potential approach is utilized to extract the positronium formation, direct ionization, and values between the positronium format...

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Article

1 Citations

1,781 Views

16 Pages

Experimental and Theoretical Electron Collision Broadening Parameters for Several Ti II Spectral Lines of Industrial and Astrophysical Interest

Lucía Isidoro-García,
Isabel de Andrés-García,
Juan Porro,
Francisco Fernández and
Cristóbal Colón

Atoms2024, 12(7), 35;https://doi.org/10.3390/atoms12070035

9 July 2024

A Q-switched Nd:YAG laser was focused on the Pb–Ti alloy samples in several laser-induced breakdown experiments in order to measure the Stark parameters of several spectral lines (58) of singly ionized titanium, including the 3504.89 Å an...

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4 Citations

1,751 Views

15 Pages

Efficient Time-Dependent Method for Strong-Field Ionization of Atoms with Smoothly Varying Radial Steps

Nicolas Douguet,
Mikhail Guchkov,
Klaus Bartschat and
Samantha Fonseca dos Santos

Atoms2024, 12(7), 34;https://doi.org/10.3390/atoms12070034

3 July 2024

We present an efficient numerical method to solve the time-dependent Schrödinger equation in the single-active electron picture for atoms interacting with intense optical laser fields. Our approach is based on a non-uniform radial grid with smoo...

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