# Partial cross sections of helium satellites at medium photon energies

## Abstract

Still of current interest is the important role of single ionization with excitation compared to single ionization alone. The coupling between the electrons and the incoming photon is a single-particle operator. Thus, an excitation in addition to an ionization, leading to a so-called satellite line in a photoelectron spectrum, is entirely due to electron-electron interaction and probes the electron correlation in the ground and final state. Therefore the authors have undertaken the study of the intensity of helium satellites He{sup +}nl (n = 2 - 6) relative to the main photoline (n = 1) as a function of photon energy at photon energies well above threshold up to 900 eV. From these results they could calculate the partial cross-sections of the helium satellites. In order to test the consistency of their satellite-to-1s ratios with published double-to-single photoionization ratios, the authors calculated the double-to-single photoionization ratio from their measured ratios using the theoretical energy-distribution curves of Chang and Poe and Le Rouzo and Dal Cappello which proved to be valid for photon energies below 120 eV. These calculated double-to-single ionization ratios agree fairly well with recent ion measurements. In the lower photon energy range the authors ratios agree better with themore »

- Authors:

- Univ. of Tennessee, Knoxville, TN (United States)
- Univ. of Nevada, Las Vegas, NV (United States) [and others

- Publication Date:

- Research Org.:
- Lawrence Berkeley Lab., CA (United States)

- OSTI Identifier:
- 603578

- Report Number(s):
- LBNL-39981

ON: DE97007345; TRN: 98:009558

- Resource Type:
- Technical Report

- Resource Relation:
- Other Information: PBD: Apr 1997; Related Information: Is Part Of Advanced light source: Compendium of user abstracts 1993--1996; PB: 622 p.

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 66 PHYSICS; HELIUM; PHOTOIONIZATION; EXCITATION; CROSS SECTIONS; X RADIATION; ELECTRON CORRELATION

### Citation Formats

```
Wehlitz, R., Sellin, I.A., and Hemmers, O..
```*Partial cross sections of helium satellites at medium photon energies*. United States: N. p., 1997.
Web. doi:10.2172/603578.

```
Wehlitz, R., Sellin, I.A., & Hemmers, O..
```*Partial cross sections of helium satellites at medium photon energies*. United States. doi:10.2172/603578.

```
Wehlitz, R., Sellin, I.A., and Hemmers, O.. Tue .
"Partial cross sections of helium satellites at medium photon energies". United States. doi:10.2172/603578. https://www.osti.gov/servlets/purl/603578.
```

```
@article{osti_603578,
```

title = {Partial cross sections of helium satellites at medium photon energies},

author = {Wehlitz, R. and Sellin, I.A. and Hemmers, O.},

abstractNote = {Still of current interest is the important role of single ionization with excitation compared to single ionization alone. The coupling between the electrons and the incoming photon is a single-particle operator. Thus, an excitation in addition to an ionization, leading to a so-called satellite line in a photoelectron spectrum, is entirely due to electron-electron interaction and probes the electron correlation in the ground and final state. Therefore the authors have undertaken the study of the intensity of helium satellites He{sup +}nl (n = 2 - 6) relative to the main photoline (n = 1) as a function of photon energy at photon energies well above threshold up to 900 eV. From these results they could calculate the partial cross-sections of the helium satellites. In order to test the consistency of their satellite-to-1s ratios with published double-to-single photoionization ratios, the authors calculated the double-to-single photoionization ratio from their measured ratios using the theoretical energy-distribution curves of Chang and Poe and Le Rouzo and Dal Cappello which proved to be valid for photon energies below 120 eV. These calculated double-to-single ionization ratios agree fairly well with recent ion measurements. In the lower photon energy range the authors ratios agree better with the ratios of Doerner et al. while for higher photon energies the agreement is better with the values of Levin et al.},

doi = {10.2172/603578},

journal = {},

number = ,

volume = ,

place = {United States},

year = {Tue Apr 01 00:00:00 EST 1997},

month = {Tue Apr 01 00:00:00 EST 1997}

}