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- W2079769647 abstract "A light-scattering photometer has been developed which is particularly useful for the determination of particle sizes (0.1 to 50 μm). The light sources for the photometer are a 6-mw helium-neon laser with wavelength of 0.6328 μm and a 10-mw argon laser that provides wavelengths of 0.5480, and 0.4880 μm. A typical two-pinhole receiving system provides angular resolution of 0.2°. The photomultiplier output pulses from single photoelectrons are fed into an amplifier, discriminator, and high speed scaler that handle rates of up to 107 counts/sec. The digital data are obtained automatically as a function of angle on punched paper tape at a teletype terminal which is also used as a time sharing device for the computer processing of the data. Experimental scattering curves for several latex standards agree well with the Lorentz-Mie theoretical curves. The Sloan method was used to obtain particle diameters for latex standards which are in agreement with the certified values; this method of data analysis is rather insensitive to differences in particle shape, to concentration, and to refractive index. The measurement of the molecular weight (51,000) of a polystyrene standard in 2-butanone with the small pinhole system mentioned above shows the versatility and high sensitivity of this photometer." @default.
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- W2079769647 date "1972-06-01" @default.
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- W2079769647 title "An automated, laser light-scattering photometer (0.1 to 170° range) with a single photon counting system" @default.
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- W2079769647 doi "https://doi.org/10.1016/0021-9797(72)90052-5" @default.
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