Nonresonant third order susceptibilities for various gases

Relative values of the nonresonant third order electric susceptibilities of various gases have been measured by nonlinear optical mixing at 532 and 683 nm. These results have been converted to absolute values by scaling them to the vibrationally resonant susceptibility of H2 which has been calculated from recent Raman cross section and linewidth data. Comparisons are offered with nonresonant electronic susceptibilities by other methods.