uks/pbe0/6-31g* mult=2 opt
geom="""
C      0.000000     0.000000     0.479931
C      0.000000     1.227297    -0.172634
C      0.000000    -1.227297    -0.172634
H      0.000000     0.000000     1.569931
H      0.000000     1.264989    -1.251976
H      0.000000     2.143189     0.399679
H      0.000000    -2.143189     0.399679
H      0.000000    -1.264989    -1.251976
"""