a system for megasonic processing of an article . in one aspect , the system for megasonic processing comprises a rotary support for supporting an article , a dispenser for applying a fluid to a surface of an article positioned on the rotary support ; and a transducer assembly . the transducer assembly comprises a transmitter positioned adjacent to the article on the rotary support so that when the fluid is applied to the surface of the article via the dispenser , a meniscus of the fluid is formed between a portion of the transmitter and the surface of the article and not more than one transducer coupled to the transmitter , the transducer adapted to oscillate at a frequency for propagating megasonic energy through the transmitter and into the meniscus of the fluid .