Table 1: Excitation energies of Cl II states relative to the ground state. Present theory is compared with the NIST compilation (http://physics.nist.gov) and the calculations of Wilson & Bell (2002) (WB) and Berrington & Nakazaki (2002) (BN).
State Present theory Experiment WB BN
$\rm 3s^23p^4$ $\rm ^3P$ 0.0000 0.0000 0.0000 0.0000
$\rm 3s^23p^4$ $\rm ^1D$ 0.1058 0.1031 0.1103 0.1082
$\rm 3s^23p^4$ $\rm ^1S$ 0.2526 0.2509 0.2589 0.2675
$\rm 3s3p^5$ $\rm ^3P^{\circ}$ 0.8210 0.8506 0.8301 0.8500
$\rm 3s^23p^3(^4S^{\circ })4s$ $\rm ^5S^{\circ}$ 0.9813 0.9800 0.9788 0.9791
$\rm 3s^23p^3(^4S^{\circ})3d$ $\rm ^5D^{\circ}$ 0.9962 1.0020 0.9949 1.0044
$\rm 3s^23p^3(^4S^{\circ })4s$ $\rm ^3S^{\circ}$ 1.0242 1.0231 1.0352 1.0221
$\rm 3s^23p^3(^2D^{\circ })3d$ $\rm ^1P^{\circ}$ 1.0353 1.0508 1.0457 1.0596a
$\rm 3s^23p^3(^4S^{\circ})3d$ $\rm ^3D^{\circ}$ 1.0875 1.0887 1.1033 1.0973
$\rm 3s^23p^3(^2D^{\circ })3d$ $\rm ^1S^{\circ}$ 1.1319 1.1382 1.1281 1.1481
$\rm 3s^23p^3(^2D^{\circ })3d$ $\rm ^3F^{\circ}$ 1.1554 1.1476 1.1627 1.1617
$\rm 3s^23p^3(^2D^{\circ })4s$ $\rm ^3D^{\circ}$ 1.1742 1.1520 1.1743 1.1677
$\rm 3s^23p^3(^4S^{\circ})4p$ $\rm ^5P$ 1.1721 1.1696   1.1634
$\rm 3s^23p^3(^2D^{\circ })4s$ $\rm ^1D^{\circ}$ 1.1903 1.1730   1.1886
$\rm 3s^23p^3(^4S^{\circ})4p$ $\rm ^3P$ 1.2063 1.1976   1.1921
$\rm 3s^23p^3(^2P^{\circ})4s$ $\rm ^3P^{\circ}$ 1.2726 1.2526   1.2752
$\rm 3s^23p^3(^2P^{\circ})4s$ $\rm ^1P^{\circ}$ 1.2939 1.2750   1.2980
$\rm 3s^23p^3(^2D^{\circ })3d$ $\rm ^3D^{\circ}$ 1.3203 1.2828   1.2959
$\rm 3s^23p^3(^2P^{\circ})3d$ $\rm ^3P^{\circ}$ 1.3420 1.3248   1.3472
$\rm 3s^23p^3(^2P^{\circ})3d$ $\rm ^3D^{\circ}$ 1.4482 1.3719   1.3881
$\rm 3s^23p^3(^2D^{\circ })3d$ $\rm ^3P^{\circ}$ 1.4905 1.4310   1.4534
$\rm 3s^23p^3(^2D^{\circ})4d$ $\rm ^1P^{\circ}$ 1.5343 1.4842   1.5013a
$\rm 3s^23p^3(^2P^{\circ})3d$ $\rm ^1P^{\circ}$ 1.5984 1.5480   1.5718
a The labeling of these states from Berrington & Nakazaki (2002)
are changed to match our assignments.

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