1959 年 28 巻 6 号 p. 336-340
There are two methods by which the particle size is determined by higher-order Tyndall spectra: (1) by measuring the red angle and corresponding red number nR, (2) by measuring the first red angle. The latter is based on the linear relation existing between logarithm of the firstt red angle γ1 and logarithm of the radius r of the particle. By using stearic acid and DOP ass samples, radii (0.3_??_0.7 μ) of aerosol particles are measured by high-order Tyndall spectra. Aerosol is made by La Mer's aerosol generator and scattered light is used without being resolved into plane-polarized components.
The following are concluded:
(1) nR+1 and nR approximate to the radius of aerosol of stearic acid and of DOP respectively.
(2) In the case of stearic acid, experimental curve and theoretical curve for n=1.44 both representing the relation log γ1 vs log r coincide well, but not so in the case of DOP.
(3) The scattered light is reddish in the range of angles where J(628)/J(523) is larger than 1.0 as previously reported by the author.