### Abstract

We report results of the calculation of electron-impact ionization cross-sections for atoms with atomic numbers Z in the intermediate range of Z-values (20 < Z < 56) using the DM formalism. For atoms with Z-values in this range (which contains many atoms of practical importance), there are some experimentally determined ionization cross-sections, but there has only been a single systematic theoretical study from 30 years ago, which was based on the Born approximation. The Born approximation tends to yield cross-sections which show an "overestimation" in the energy regime of the cross-section maximum compared to experimental data. The DM approach, on the other hand, has adequately reproduced the region of the cross-section maximum for many low-Z atoms as well as for the heavier rare gases. In the present case of atoms with Z-values from 20 to 56, the DM calculation typically shows a cross-section maximum lower than that predicted from the Born approximation by 25-50%, except for Xe, Ni, Cd, and Pd. The Born approximation and the DM formalism yield cross-sections that converge at higher impact energies.

Original language | English (US) |
---|---|

Pages (from-to) | 58-62 |

Number of pages | 5 |

Journal | International Journal of Mass Spectrometry |

Volume | 271 |

Issue number | 1-3 |

DOIs | |

State | Published - Apr 1 2008 |

### Fingerprint

### Keywords

- Cross-section calculations
- Electron-impact ionization

### ASJC Scopus subject areas

- Physical and Theoretical Chemistry
- Spectroscopy

### Cite this

*International Journal of Mass Spectrometry*,

*271*(1-3), 58-62. https://doi.org/10.1016/j.ijms.2007.10.001

**Calculated absolute cross-sections for the electron-impact ionization of atoms with atomic numbers between 20 and 56 using the Deutsch-Märk (DM) formalism.** / Deutsch, H.; Becker, K.; Märk, T. D.

Research output: Contribution to journal › Article

*International Journal of Mass Spectrometry*, vol. 271, no. 1-3, pp. 58-62. https://doi.org/10.1016/j.ijms.2007.10.001

}

TY - JOUR

T1 - Calculated absolute cross-sections for the electron-impact ionization of atoms with atomic numbers between 20 and 56 using the Deutsch-Märk (DM) formalism

AU - Deutsch, H.

AU - Becker, K.

AU - Märk, T. D.

PY - 2008/4/1

Y1 - 2008/4/1

N2 - We report results of the calculation of electron-impact ionization cross-sections for atoms with atomic numbers Z in the intermediate range of Z-values (20 < Z < 56) using the DM formalism. For atoms with Z-values in this range (which contains many atoms of practical importance), there are some experimentally determined ionization cross-sections, but there has only been a single systematic theoretical study from 30 years ago, which was based on the Born approximation. The Born approximation tends to yield cross-sections which show an "overestimation" in the energy regime of the cross-section maximum compared to experimental data. The DM approach, on the other hand, has adequately reproduced the region of the cross-section maximum for many low-Z atoms as well as for the heavier rare gases. In the present case of atoms with Z-values from 20 to 56, the DM calculation typically shows a cross-section maximum lower than that predicted from the Born approximation by 25-50%, except for Xe, Ni, Cd, and Pd. The Born approximation and the DM formalism yield cross-sections that converge at higher impact energies.

AB - We report results of the calculation of electron-impact ionization cross-sections for atoms with atomic numbers Z in the intermediate range of Z-values (20 < Z < 56) using the DM formalism. For atoms with Z-values in this range (which contains many atoms of practical importance), there are some experimentally determined ionization cross-sections, but there has only been a single systematic theoretical study from 30 years ago, which was based on the Born approximation. The Born approximation tends to yield cross-sections which show an "overestimation" in the energy regime of the cross-section maximum compared to experimental data. The DM approach, on the other hand, has adequately reproduced the region of the cross-section maximum for many low-Z atoms as well as for the heavier rare gases. In the present case of atoms with Z-values from 20 to 56, the DM calculation typically shows a cross-section maximum lower than that predicted from the Born approximation by 25-50%, except for Xe, Ni, Cd, and Pd. The Born approximation and the DM formalism yield cross-sections that converge at higher impact energies.

KW - Cross-section calculations

KW - Electron-impact ionization

UR - http://www.scopus.com/inward/record.url?scp=39049132153&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=39049132153&partnerID=8YFLogxK

U2 - 10.1016/j.ijms.2007.10.001

DO - 10.1016/j.ijms.2007.10.001

M3 - Article

VL - 271

SP - 58

EP - 62

JO - International Journal of Mass Spectrometry

JF - International Journal of Mass Spectrometry

SN - 1387-3806

IS - 1-3

ER -