In HCl medium,cationic surfactants and AuI~-_2 form stable association particles. It exhibits an absorption peak at 560 nm,two synchronous scattering peaks at 320 nm and 470 nm and a resonance scattering peak at 580 nm.

• 在HCl介质中；AuI-2与阳离子表面活性剂可形成较稳定的缔合微粒；它在560nm产生一个吸收峰；在320；470nm产生2个同步散射峰；在580nm产生1个共振散射峰.