Abstract
The excited state behavior of dye molecules under intense pulsed laser excitation appears to differ from that under low-power cw Xenon lamp excitation. In the latter case molecules absorb photons (from the lamp). go to the excited state and produce normal fluorescence. This is a one photon-one molecule process. But in the former case. two excited dye molecules combine together to form 'superexciplex' and produce fluorescence and also amplified spontaneous emission (ASE) under intense, sharp, laser pulse excitation, This paper gives sufficient evidence verifying the existence of this new molecular species.