Related Experiment Video
Updated: Dec 27, 2025

Sample Preparation and Experimental Design for In Situ Multi-Beam Transmission Electron Microscopy Irradiation Experiments
Published on: June 27, 2022
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.
None:
Analytic fits to the recommended electron-impact excitation and ionization cross sections for Be I are presented. The lowest 19 terms of configurations 2snl (n ≤ 4) and 2p 2 terms below the first ionization limit are considered. The fits are based on the accurate calculations with the convergent close coupling (CCC) method as well as the B-spline R-matrix (BSR) approach. The fitted cross sections provide rate coefficients that are believed to approximate the original data within 10% with very few exceptions. The oscillator strengths for the dipole-allowed transitions between all the considered states are calculated with the relativistic multi-configuration Dirac-Hartree-Fock (MCDHF) approach and compared with the CCC and BSR results. This comparison shows a very good agreement except for a handful of cases with likely strong cancellations.
More Related Videos
Related Concept Videos
Ionization Energy
Chemical Ionization (CI) Mass Spectrometry
π Electron Effects on Chemical Shift: Overview
Mass Spectrum: Interpretation
Electrospray Ionization (ESI) Mass Spectrometry
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
Atomic Emission Spectroscopy: Lab

