Optical effects of space weathering: The role of the finest fraction

1993 ◽  
Vol 98 (E11) ◽  
pp. 20817 ◽  
Author(s):  
C. M. Pieters ◽  
E. M. Fischer ◽  
O. Rode ◽  
A. Basu
Keyword(s):  
Space Weathering ◽  
Optical Effects

Role of phonon subsystems in second order optical effects in semiconductor semimagnetic Pb 1-x R x X (R=Pr, Yb and X=S, Se, Te)

2005 ◽  
Author(s):  
K. Nouneh ◽  
I. Kityk ◽  
S. Benet ◽  
R. Viennois ◽  
S. Charar ◽  
...  
Keyword(s):  
Second Order ◽  
Optical Effects

scholarly journals Investigating the Role of Sulfides in the Space Weathering of Carbonaceous Chondrites

2020 ◽  
Vol 26 (S2) ◽  
pp. 2588-2590
Author(s):  
Laura Chaves ◽  
Michelle Thompson ◽  
Mark Loeffler
Keyword(s):  
Space Weathering ◽  
Carbonaceous Chondrites

Rigorous light-scattering simulations of space-weathering effects on reflectance spectra

2021 ◽  
Author(s):  
Antti Penttilä ◽  
Timo Väisänen ◽  
Johannes Markkanen ◽  
Julia Martikainen ◽  
Tomas Kohout ◽  
...  
Keyword(s):  
Light Scattering ◽  
Reflectance Spectra ◽  
Space Weathering ◽  
Spectral Slope ◽  
Simulation Tools ◽  
Multi Scale ◽  
Spectral Bands ◽  
Size Scales ◽  
Weathering Effects

<p>We present a multi-scale light-scattering model that is capable of simulating the reflectance spectra of a regolith layer. In particular, the model can be applied to a case where the regolith grains have varying amounts of nanophase inclusions due to space weathering of the material. As different simulation tools are employed for different size scales of the target geometry (roughly, nano-, micro-, and millimeter scales), the particle size effects, the surface reflections, and the volume scattering can all be properly accounted for. Our results with olivine grains and nanophase iron inclusions verify the role of the nanoinclusions in the reflectance spectra of space-weathered materials. Together with the simulation results, we give simplified explanations for the space-weathering effects based on light scattering, namely the decrease of albedo, the general increase of the red spectral slope, and the dampening of the spectral bands. We also consider the so-called ultraviolet bluing effect and show how the change in the spectral slope over the ultraviolet-visual wavelengths is due to the decrease of reflectance in the visual wavelengths rather than the increase of reflectance in the ultraviolet part.</p>

scholarly journals A nanostructural basis for gloss of avian eggshells

2015 ◽  
Vol 12 (103) ◽  
pp. 20141210 ◽  
Author(s):  
Branislav Igic ◽  
Daphne Fecheyr-Lippens ◽  
Ming Xiao ◽  
Andrew Chan ◽  
Daniel Hanley ◽  
...  
Keyword(s):  
Underlying Mechanism ◽  
Chemical Analyses ◽  
Optical Effect ◽  
Visual Appearance ◽  
Force Microscopy ◽  
Atomic Force ◽  
Optical Effects ◽  
Bird Eggs ◽  
Main Factor

The role of pigments in generating the colour and maculation of birds' eggs is well characterized, whereas the effects of the eggshell's nanostructure on the visual appearance of eggs are little studied. Here, we examined the nanostructural basis of glossiness of tinamou eggs. Tinamou eggs are well known for their glossy appearance, but the underlying mechanism responsible for this optical effect is unclear. Using experimental manipulations in conjunction with angle-resolved spectrophotometry, scanning electron microscopy, atomic force microscopy and chemical analyses, we show that the glossy appearance of tinamou eggshells is produced by an extremely smooth cuticle, composed of calcium carbonate, calcium phosphate and, potentially, organic compounds such as proteins and pigments. Optical calculations corroborate surface smoothness as the main factor producing gloss. Furthermore, we reveal the presence of weak iridescence on eggs of the great tinamou ( Tinamus major ), an optical effect never previously documented for bird eggs. These data highlight the need for further exploration into the nanostructural mechanisms for the production of colour and other optical effects of avian eggshells.

scholarly journals An experimental approach to understanding the optical effects of space weathering

Icarus ◽  
2007 ◽  
Vol 192 (2) ◽  
pp. 629-642 ◽  
Author(s):  
Sarah K. Noble ◽  
Carlé M. Pieters ◽  
Lindsay P. Keller
Keyword(s):  
Experimental Approach ◽  
Space Weathering ◽  
Optical Effects

What is the role of spin–orbit interaction in magneto-optical effects?

1999 ◽  
Vol 85 (8) ◽  
pp. 5115-5117 ◽  
Author(s):  
You Xu ◽  
Jiehui Yang ◽  
Maurice Guillot
Keyword(s):  
Orbit Interaction ◽  
Spin Orbit ◽  
Spin Orbit Interaction ◽  
Optical Effects

scholarly journals The Role of Hydrated Minerals and Space Weathering Products in the Bluing of Carbonaceous Asteroids

2021 ◽  
Vol 2 (2) ◽  
pp. 68
Author(s):  
David Trang ◽  
Michelle S. Thompson ◽  
Beth E. Clark ◽  
Hannah H. Kaplan ◽  
Xiao-Duan Zou ◽  
...  
Keyword(s):  
Space Weathering ◽  
Hydrated Minerals

Third-Order Nonlinear Optical Effects in Organic Polymeric Films

1987 ◽  
Vol 109 ◽  
Author(s):  
Paras N. Prasad
Keyword(s):  
Nonlinear Optical ◽  
Experimental Studies ◽  
Field Method ◽  
Polymeric Films ◽  
Third Order ◽  
Langmuir Blodgett ◽  
Optical Effects ◽  
Langmuir Blodgett Films ◽  
Finite Field Method

ABSTRACTThis paper presents some recent theoretical and experimental work carried out in the author's laboratory on the nonlinear optical properties of organic polymers. The ab initio SCF theory has been used with the finite field method to calculate the third order nonlinearity of conjugated structures in order to understand the effect of conjugation and the role of substituents. Experimental studies of third order resonant nonlinearlty in polythiophenes and cumylphenoxy phthalocyanine, the latter in the form of Langmuir-Blodgett films, are presented using femtosecond degenerate four wave mixing.

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