Calculation of second derivatives at RHF-CCSD level using finite differences O O 1 R1 H 1 R2 2 A H 2 R2 1 A 3 D R1 = 1.452888059894715 R2 = 0.968860317612440 A = 99.544308670267973 D = 116.673816797800133 *ACES2(CALC=CCSD,BASIS=PVDZ,MEMORY=40000000 VIB=FINDIF SCF_CONV=10,CC_CONV=10,LINEQ_CONV=10)