Thin carbon foils have become integral parts of low‐energy particle detectors in forthcoming space experiments. In these devices, the foil acts as electron source for signal generation. Since 10–20‐eV photons can also generate electrons from these foils and since intense HL&agr; and Heiresonance lines prevail in space environment, forward photoemission yield in carbon foils must be investigated. Crabon foils of 2.0, 7.0, and 14.0 &mgr;g cm−2thickness (density 1.35 g cm−3) are subjected to 121.6‐nm or 10.2‐eV photons and 58.4‐nm or 21.2‐eV photons and the corresonding forward photoemission yield and transmittance are obtained. Energy distributions of photoemitted electrons are also measured.