E(lowest component)-E(average)
             cm-1   kcal/mol   kJ/mol
H     2S      0.00    0.000     0.00
H-    1S      0.00    0.000     0.00
B     2P    -10.17   -0.029    -0.12
B-    3P     -5.75   -0.016    -0.07
C     3P    -29.58   -0.085    -0.35
C-    4S      0.00    0.000     0.00
N     4S      0.00    0.000     0.00
N- unstable   0.00    0.000     0.00
O     3P    -77.97   -0.223    -0.93
O-    2P    -59.03   -0.169    -0.71
F     2P   -134.70   -0.385    -1.61
F-    1S      0.00    0.000     0.00
Al    2P    -74.71   -0.214    -0.89
Al-   3P    -45.57   -0.130    -0.55
Si    3P   -149.68   -0.428    -1.79
Si-   4S      0.00    0.000     0.00
P     4S      0.00    0.000     0.00
P-    3P    -89.56   -0.256    -1.07
S     3P   -195.77   -0.560    -2.34
S-    2P   -161.18   -0.461    -1.93
Cl    2P   -294.12   -0.841    -3.52
Cl-   1S      0.00    0.000     0.00

Based on following data:

              Expt.(degen in paren)            Best computed nonzero    (cm-1)
H      2S     no 1st-order splitting
H-     1S     no 1st-order splitting
B      2P     0(2), 15.254(4)                      14.7
B-     3P     0(1), 3.23(3), 8.41(5) [a]           2.49,7.50
C      3P     0(1), 16.40(3), 43.40(5)             13.4,40.2
C-     4S     no 1st-order splitting
N      4S     no 1st-order splitting
N-  unstable  no stable anion
O      3P     0(5), 158.265(3), 226.977(1)         155.1,232.6
O-     2P     0(4), 177.08(2)                      179.0
F      2P     0(4), 404.1(2)                       399.8
F-     1S     no 1st-order splitting
Al     2P     0(2), 112.061(4)                     115.4
Al-    3P     0(1), 22.7+/-0.3(3),68.4+/-0.4(5)[b] 22.9,68.8
Si     3P     0(1), 77.113(3), 223.157(5)          72.8,218.5
Si-    4S     no 1st-order splitting
P      4S     no 1st-order splitting
P-     3P     0(5), 181(3), 263(1)                 198.2,297.3
S      3P     0(5), 396.09(3), 573.65(1)           395.3,593.0
S-     2P     0(4), 483.54(2)                      493.8
Cl     2P     0(4), 882.36(2)                      884.8
Cl-    1S     no 1st-order splitting

All expt. data were taken from M. W. Chase et al.,
JANAF thermochemical tables, 3rd edition (NBS, 1985),
also known as JPhysChemRefData 14, supplement 1 (1985)
[a] M. Scheer, R. C. Bilodeau, and H. K. Haugen, PRL 80, 2562 (1998)
[b] M. Scheer, R.C. Bilodeau, J. Thogersen, and H.K. Haugen,
PRA 57, 1493 (1998)
All computed data from G. de Oliveira, J. M. L. Martin, F. De proft, and P. Geerlings,
Phys. Rev. A, in press (1999)