### Abstract

Binary [Formula Presented] measurements are reported for ionization-excitation processes of [Formula Presented] The experiments were performed at impact energies of 1200, 1600, and 2000 eV using an energy- and momentum-dispersive spectrometer. Momentum profiles for transitions to the [Formula Presented] and [Formula Presented] excited final ion states are presented as normalized intensities relative to the cross section of the primary ionization to the [Formula Presented] ground ion state. The results are compared with theoretical calculations of Lermer et al. [Phys. Rev. A 56, 1393 (1997)] using the first-order plane-wave impulse approximation. Certain features of the discrepancies between experiment and theory can be explained by incorporating contributions from the second-order two-step mechanisms into the [Formula Presented] cross sections. Furthermore, the present results suggest that [Formula Presented] and [Formula Presented] cross sections approach their high-energy limits in different ways.

Original language | English |
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Number of pages | 1 |

Journal | Physical Review A - Atomic, Molecular, and Optical Physics |

Volume | 68 |

Issue number | 4 |

DOIs | |

Publication status | Published - 2003 Jan 1 |

### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics

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## Cite this

*Physical Review A - Atomic, Molecular, and Optical Physics*,

*68*(4). https://doi.org/10.1103/PhysRevA.68.042710