%chk=sn2_ts_opt.chk
%nprocshared=25
%mem=100GB

#P B3LYP/def2TZVP Opt=(TS,CalcFC,NoEigenTest)

SN2 transition state search

-1 1
H         -1.91051       -1.20940        0.64919
H         -1.91051       -0.61336       -0.99331
H         -1.91051        0.51106        0.34413
C         -1.55384       -0.43723        0.00000
Cl        +0.64616       -0.43723        0.00000
Br        -3.75384       -0.43723        0.00000