| Autor: |
Kreis, C., Schmitz, J. R., Merkt, F. |
| Zdroj: |
Physical Chemistry Chemical Physics (PCCP); 7/28/2024, Vol. 26 Issue 28, p19359-19368, 10p |
| Abstrakt: |
Despite the importance of MgO+ for understanding the electronic structure and chemical bonds in alkaline-earth metal oxides and its potential astrophysical relevance, hardly any spectroscopic information is available on this molecular cation. We report on a high-resolution photoelectron spectroscopic study of MgO using a resonant (1 + 1′) two-photon excitation scheme in combination with PFI-ZEKE photoelectron spectroscopy. By carrying out the resonant excitation via selected rotational levels of several intermediate states of different electronic configurations, total electronic spins, and internuclear distances, a broad range of vibrational levels of the X+ 2ΠΩ (Ω = 3/2, 1/2) ground and A+ 2Σ+ first excited states of MgO+ were observed for the first time. The new data provide a full characterisation of the rovibronic level structure of MgO+ up to 2 eV (16 000 cm−1) of internal energy. A full set of vibrational, rotational and spin–orbit-coupling molecular constants were extracted for these two electronic states. The adiabatic ionisation energy and the singlet–triplet interval of 24Mg16O were determined to be 64 577.65(20) cm−1 and 2492.4(3) cm−1, respectively. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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