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Titanium Digermanium: Theoretical Assignment of Electronic Transitions Underlying Its Anion Photoelectron Spectrum.
Journal of Physical Chemistry. A 2017 March 10
Electronic structures of both the anionic and neutral triatomic species TiGe2 -/0 were theoretically studied employing single-reference (DFT and RCCSD(T)) and multiconfigurational (CASSCF/CASPT2 and CASSCF/NEVPT2) methods with large basis sets. The ground state of TiGe2 - (C2v ) was identified to be4 B1 , but the2 A1 state is nearly degenerate, whereas the3 B1 is clearly the ground state of the neutral TiGe2 (C2v ). On the basis of the computed ground and excited states of both neutral and anionic structures, all electronic transitions giving rise to experimental anion photoelectron bands in the spectrum of TiGe2 - can now be assigned. The X band of the anion photoelectron spectrum is attributed to a one-electron transition between two ground states4 B1 →3 B1 . Three neutral excited states 23 A2 , 25 B1 , and 35 B1 are energetically responsible for the B band upon one-electron photodetachement from the anionic ground state4 B1 . The C band is assigned to the transition4 B1 → 25 A1 . A transition from the nearly degenerate ground state2 A1 of the anion to the low-spin1 A1 of the final neutral state can be ascribed to the A band. Furthermore, the first two bands' progressions, whose normal vibrational modes were accessible from CASSCF/CASPT2 calculations, were also simulated by determination of multidimensional Franck-Condon factors.
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