AM1 Geometry Optimization (using Z-matrix)
$CONTRL SCFTYP=RHF RUNTYP=OPTIMIZE UNITS=ANGS COORD=ZMT $end
$SYSTEM TIMLIM=600000 MEMORY=2500000 $END
$STATPT NSTEP=1000 $END
$BASIS GBASIS=AM1 $END
$GUESS GUESS=HUCKEL $END
$DATA
AM1/
C1
c
h 1 hc2
h 1 hc3 2 hch3
h 1 hc4 2 hch4 3 dih4
c 1 cc5 2 cch5 3 dih5
h 5 hc6 1 hcc6 2 dih6
h 5 hc7 1 hcc7 2 dih7
h 5 hc8 1 hcc8 2 dih8
hc2 1.118896
hc3 1.118896
hch3 109.471
hc4 1.118896
hch4 109.471
dih4 120.000
cc5 1.526001
cch5 109.471
dih5 -120.000
hc6 1.118896
hcc6 109.471
dih6 180.000
hc7 1.118897
hcc7 109.471
dih7 -60.000
hc8 1.118896
hcc8 109.471
dih8 60.000
$END
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