Mosnier, JP;Kennedy, ET;van Kampen, P;Cubaynes, D;Guilbaud, S;Sisourat, N;Puglisi, A;Carniato, S;Bizau, JM

2016

June

PHYSICAL REVIEW A

Inner-shell photoexcitations as probes of the molecular ions CH+, OH+, and SiH+: Measurements and theory

Published

15 ()

YOUNG STELLAR OBJECTS RAY IONIZATION PROTOPLANETARY DISKS INTERSTELLAR CLOUDS CHEMISTRY PLASMA H3O+ PHOTOIONIZATION SPECTROSCOPY H2O+

93

Spectral probes for the CH+, OH+, and SiH+ hydride molecular ions that play key roles in astrophysics and plasma processes are presented. The merged-beam technique at the SOLEIL synchrotron was used to record the photoionization (ion yield) spectra of CH+, OH+, and SiH+ and that of their parent atomic ions, in the K-shell and L-shell regions, respectively. Energies and oscillator strengths for the K alpha (CH+ and OH+) and La (SiH+) transitions were determined from the spectra. Ab initio calculations interpret the experimental data in terms of contributions from ground and excited valence electronic states.

COLLEGE PK

2469-9926

10.1103/PhysRevA.93.061401