Accuracy

silicon, 3d(u) 3s(1)3p(3)   1864 Silicon, 3D(u) 3s(1)3p(3)

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    #  Species Formula
  1854 Sodium tetrafluoroaluminateF4NaAl
  1855 Dialuminum oxide, cationOAl2
  1856 Al2O (Geo)OAl2
  1857 Dialuminum oxideOAl2
  1858 Al2O2, cationO2Al2
  1859 Aluminum oxide, dimerO2Al2
  1860 Aluminum trifluoride, dimerF6Al2
  1861 Silicon, cationSi
  1862 Silicon, 1D(g) 3s(2)3p(2)Si
  1863 Silicon, 1S(g) 3s(2)3p(2)Si
  1864 Silicon, 3D(u) 3s(1)3p(3) Si
  1865 Silicon, 5S(u) 3s(1)3p(3)Si
  1866 Silicon, atomSi
  1867 SiHHSi
  1868 SiH (Geo)HSi
  1869 Silylene (singlet) (Geo)H2Si
  1870 Silylene (singlet)H2Si
  1871 Silyl, cationH3Si
  1872 SilylH3Si
  1873 Silyl, anionH3Si
  1874 Silane (Geo)H4Si


For electronic state 1,3,D(U)
ΔHf: 138.7 kcal/mol,     REF: NIST Chemistry WebBook, NIST Standard Reference Database, No. 69; W. G. Mallard, P. J. Linstrom, Eds., National Institute of Standards and Technology, Gaithersberg, http://webbook.nist.gov/chemistry.
  
 OPEN(4,4) MECI ROOT=24 PM7
Silicon, 3D(u) 3s(1)3p(3)
 HR=NIST H=138.74 ROOT=1,3,D(U)
 Si     0.00000000 +0   0.00000000 +0   0.00000000 +0