T in K cross sect. at 233.5 nm 720 2.44e-19 866 2.59e-19 913 2.41e-19 1027 2.53e-19 1258 2.66e-19 1619 2.59e-19 1796 3.34e-19 1840 3.19e-19 2017 3.98e-19