Resonant two-photon ionization spectroscopy of the 13-electron triatomic Si2N

Resonant two-photon ionization spectra of 28Si2N, 28,29Si2N, and 28,30Si2N have been collected between 32000 cm−1 and 36000 cm−1. A fit of the rotationally resolved spectrum of the most intense band of 28Si2N at 34314 cm− reveals the transition to be 2Σu+ å X̃2∏g, 12. A molecular orbital analysis is made to justify the assignment. The geometric structure is determined to be linear and centrosymmetric in both the ground and excited state with r0″(SiN) = 1.6395 ± 0.0014 Å and r′(SiN) = 1.6343 ± 0.0014 Å. The ionization energy energy is determined to be less than 8.51 eV.