Secondary electron emission (SEE) properties of molecular substances, DC-704 (Dow Corning) and Octoil-S (CEC), were studied. Measurements were made on SEE coefficient and on inelastic reflection coefficient for a primary energy
Ep in the range of 502000 eV at various thicknesses of DC-704 and Octoil-S films on tungsten. The maximum emission depth of true secondary electrons, λ's, are found to be about 40 and 70 Å for DC-704 and Octoil-S respectively, and be independent of
Ep for the range 4002000 eV. The efficiency of inelastically reflected primaries in producing true secondaries is 3 to 4 times larger than that of incident primaries. It is concluded that SEE properties of these molecular substances are similar to those of metals in several respects.
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