This experimental and theoretical study of light scattering techniques addresses the questions of deconvolution of light scattering data (phase functions and optical resonance spectra) from droplets and the uniqueness of that deconvolution for the measurement of size and refractive index of microspheres. Theory and experiment are compared for single component and multicomponent microdroplets and for layered microspheres levitated in electrodynamic balances. Size changes of the order of 1 A have been measured by tracking resonance shifts of slowly evaporating single component droplets. For multicomponent droplet evaporation, which involves simultaneous size and refractive index changes, and for rapid evaporation, precision is reduced to approximately 1 part in 10(4) for each parameter.

Symbols A area per molecule (Á2) a damping constant (mm'1) wavelength (mm) e surface dilatational elasticity (mN/m) k wave number (mm-1) j;s viscosity of the solution (mP) f amplitude of the transverse mode 7r surface pressure (mN/ m) p density of the solution (kg m~3 45) a absolute surface tension (mN/m) T temperature angular frequency (s_1)Registry No. PVA,

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