Time-delayed Three-wave Mixing of Nanosecond Incoherent Laser Beams for Measuring Short Relaxation Times

Abstract
Time-delayed three-wave mixing (y1 = y1 + y m y, y1 p y) of nanosecond incoherent light beams is proposed as a method for measuring orientational relaxation times. The relaxation times of benzene and nitrobenzene (*3·8 ps and 38 ps) have been measured.