The continuous atomic-absorption cross section of lithium and sodium vapors has been measured between 600 and 1000 Å using photoelectric techniques. Curves and tables are presented of the atomic-absorption cross section versus energy from their series limits to 600 Å. A comparison is made between these results and recent theoretical estimates. The conclusion is that theory and experiment are in poor agreement for sodium at photon energies above 7 eV.
R. D. HUDSON and VIRGINIA L. CARTER, "Atomic Absorption Cross Sections of Lithium and Sodium Between 600 and 1000Å," J. Opt. Soc. Am. 57, 651-654 (1967)