Abstract
In Raman-Nath diffraction by microparticles in water, even-order diffraction is enhanced selectively by the suspension of microparticles. Intensities of diffracted beams increase markedly for particles larger than 10 µ m in diameter. By microscopic observation, particles 10–20 µ m in diameter align periodically at the nodes of an ultrasonic standing wave. On the other hand, particles 1–7 µ m in diameter distribute widely around the nodes. Since larger particles tend to remain at the nodes even after the ultrasonic wave is removed, even-order beams remain diffracted for several seconds.
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