T in K cross sect. at 226 nm 780 3.40e-19 1064 3.65e-19 1348 3.67e-19 1632 3.59e-19 1916 3.47e-19 2200 3.32e-19 2484 3.17e-19 2768 3.03e-19 3052 2.89e-19 3336 2.75e-19 3620 2.63e-19