PT Journal AU Heuser, J Höfener, S TI Analytical Nuclear Excited-State Gradients for the Second-Order Approximate Coupled-Cluster Singles and Doubles (CC2) Method Employing Uncoupled Frozen-Density Embedding SO Journal of chemical theory and computation PY 2018 BP 4616 EP 4628 VL 14 IS 9 DI 10.1021/acs.jctc.8b00369 LA english ER