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Recommended electron-impact excitation and ionization cross sections for Be I
Dipti1, T Das2, K Bartschat3
1National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Atomic Data and Nuclear Data Tables
|March 3, 2020
Summary
Analytic fits to electron-impact cross sections for Beryllium (Be I) were generated using advanced computational methods. These fits provide accurate rate coefficients for atomic physics research.
Area of Science:
- Atomic Physics
- Quantum Mechanics
- Computational Chemistry
Background:
- Accurate electron-impact cross sections are crucial for modeling atomic processes in various environments.
- Previous calculations may lack sufficient precision for certain applications.
Purpose of the Study:
- To provide analytic fits for electron-impact excitation and ionization cross sections of Beryllium (Be I).
- To generate reliable rate coefficients based on these fits.
- To compare calculated oscillator strengths with existing methods.
Main Methods:
- Convergent Close Coupling (CCC) method
- B-spline R-matrix (BSR) approach
- Relativistic Multi-Configuration Dirac-Hartree-Fock (MCDHF) method
Main Results:
- Analytic fits were developed for electron-impact cross sections of Be I, considering 19 low-lying terms.
- The fitted cross sections yield rate coefficients accurate within 10% of original data.
- Oscillator strengths calculated via MCDHF show good agreement with CCC and BSR results.
Conclusions:
- The analytic fits provide a computationally efficient way to access accurate cross-section data for Be I.
- The study validates the accuracy of CCC and BSR methods for Be I electron-impact processes.
- Reliable atomic data is established for further research in plasma physics and astrophysics.
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