Scattering of 633 nm photons from silica aerogels with densities 71, 105 and 143 kg m -3 is investigated. A polarised He-Ne laser is used as a light source. Two types of data sets are determined: (i) total specific extinction coefficients for the porous specimens and (ii) the scattered intensity as a function of scattering angle theta , with 20 degrees <or= theta <or=160 degrees . The derived correlation lengths a c are in the range 10-25 nm and show a systematic decrease with density. The extinction coefficients E are in the range of 10 m -1 ; here no systematic variation of E with density is observed.
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Beck et al. (1989) studied this question.
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