Revisiting the blueshift of the 2.0 eV emission of strontium titanate: dynamical crystal field splitting due to the ferroelectric soft mode - Graham, Joseph T; Graham, Joseph T; Crespillo, Miguel L; Crespillo, Miguel L; Agullo-Lopez, Fernando; Weber, William J; Weber, William J (Nuclear Instruments & Methods In Physics Research Section B-Beam Interactions With Materials And Atoms, 2026)