| Autor: |
Barker, Beau J., Antonov, Ivan O., Heaven, Michael C., Peterson, Kirk A. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 3/14/2012, Vol. 136 Issue 10, p104305, 9p, 4 Charts, 8 Graphs |
| Abstrakt: |
The electronic spectra of ThF and ThF+ have been examined using laser induced fluorescence and resonant two-photon ionization techniques. The results from high-level ab initio calculations have been used to guide the assignment of these data. Spectra for ThF show that the molecule has an X 2Δ3/2 ground state. The upper spin-orbit component, X 2Δ5/2 was found at an energy of 2575(15) cm-1. The low-lying states of ThF+ were probed using dispersed fluorescence and pulsed field ionization - zero kinetic energy (PFI-ZEKE) photoelectron spectroscopy. Vibronic progressions belonging to four electronic states were identified. The lowest energy states were clearly 1Σ+ and 3Δ1. Although the energy ordering could not be rigorously determined, the evidence favors assignment of 1Σ+ as the ground state. The 3Δ1 state, of interest for investigation of the electron electric dipole moment, is just 315.0(5) cm-1 above the ground state. The PFI-ZEKE measurements for ThF yielded an ionization energy of 51 581(3) cm-1. Molecular constants show that the vibrational constant increases and the bond length shortens on ionization. This is consistent with removal of a non-bonding Th-centered 6d or 7s electron. Laser excitation of ThF+ was used to probe electronically excited states in the range of 19 000-21 500 cm-1. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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