The effect of particle size and porosity on spectral contrast in the mid-infrared

Spectroscopy of Loose and Cemented Sulfate-Bearing Soils: Implications for Duricrust on Mars

“…Particle size plays an important role in controlling the spectral characteristics of powders (e.g., Salisbury and Eastes 1985, Crown and Pieters 1987, Salisbury and Wald 1992, Clark 1999 and in particular very fine particle sizes have unique spectral effects (Mustard andHays 1997, Cooper andMustard 1999). Therefore care was taken to match the physical properties of the martian surface materials, especially a particle size of less than 15 µm (Moore et al 1987, Erard et al 1994, Pollack et al 1995, Ferguson et al 1999, Tomasko et al 1999.…”

The Effect of the Particle Size on the Fundamental Vibrations of the [CO32–] Anion in Calcite

“…18 Furthermore physical compression, packing and porosity of powdered materials also play important roles in shaping the spectral response. 8,16,19 By comparison with infrared studies, particle size effects on Raman spectra are poorly documented. Specifically how the type-behaviors of [CO3 2-] internal modes in calcite as described by infrared spectroscopy find expression in relation to particle size effects detectable in Raman spectroscopy, although available evidence suggests that the absolute intensity of the [CO3 2-] internal modes of carbonate minerals do vary as a function of powder particle size ranges.…”

Spectral properties of simulated impact glasses produced from martian soil analogue JSC Mars-1

“…9b, 10b, 11b) are higher for the coarser size separates, as expected. Spectral contrasts of Reststrahlen bands are known to be low for fine particle sizes (e.g., Lyon, 1964;Vincent and Hunt, 1968) due to increasing contribution of photon trapping (Lyon, 1964;Aronson et al, 1966;Salisbury and Eastes, 1985) and volume scattering (Salisbury and Wald, 1992). Vesicular textures of our L-glasses (Fig.…”