Emission spectra following the photolysis of iodomethanes (CHI3, CH2I2, CH3I, and CH2ICI) at 266 nm were recorded in a slow flow cell. In addition to emission from the electronically excited species including CH (A(2)Delta, B-2 Sigma(-), and C-2 Sigma(+)), C-2 (d(3)Pi g), and atomic iodine (P-4 degrees), a series of emission bands was observed in the 12 000-19 000 cm(-1) region. The dominant structure of these emission bands was verified as the I-2 B-3 Pi(+)(0,u)-(XEg+)-E-1 emission at the 532 nm excitation, and the observed I-2 was formed from collisions between iodine atoms generated from the C-I bond dissociation in these iodomethanes. The I-2 emission spectra following the photolysis of CH2I2 at different wavelengths were acquired, and the threshold energy for the first C-I bond cleavage was determined to be 208 +/- 1 kJ mol(-1). We also obtained the emission spectra of pure I-2 at several visible excitation wavelengths for comparison with those from the photolysis of iodomethanes, and a least-squares global fit of the observed I-2 emission bands yields more accurate anharmonicity parameters for the vibrational structure in the I-2 B-X transition.