Ultraviolet picosecond pump-probe spectroscopy with a synchronously pumped dye laser. Rotational diffusion of diphenyl butadiene

Abstract The second harmonic of a picosecond synchronously mode-locked dye laser has been used to study orientational relaxation of 1,4-diphenyl-1,3-butadiene in dilute solution. The dye laser was amplified by a novel high repetition rate (1–5 MHz) amplifier. The motion of diphenylbutadiene in tetradecane is well described by hydrodynamics with a slip boundary condition.