COLLISIONLESS PRODUCTION OF ELECTRONICALLY EXCITED SPECIES VIA IR LASER PHOTOLYSIS

In the absence of collisions, luminescence is observed upon irradiation of vinyl cyanide molecules with the focused output from a CO2 TEA laser, namely, two broad, structureless features, at 390 nm and in the IR whose intensity depends linearly on pressure from 10-4 to 10-2 torr. At higher pressures, a collision induced emission component appears. The time resolved fluorescence reveals a fast rise, never longer than the CO2 laser pulse duration, and a much slower decay. The luminescence is believed to originate from a dissociation fragment. © 1979.