Absorption and Scattering of Light by Small Particles (Wiley by Craig F. Bohren, Donald R. Huffman

By Craig F. Bohren, Donald R. Huffman

Absorption and Scattering of sunshine through Small ParticlesTreating absorption and scattering in equivalent degree, this self-contained, interdisciplinary research examines and illustrates how small debris soak up and scatter gentle. The authors emphasize that any dialogue of the optical habit of small debris is inseparable from an entire knowing of the optical habit of the dad or mum material-bulk subject. To divorce one thought from the opposite is to render any learn on scattering concept heavily incomplete.Special positive factors and demanding subject matters lined during this booklet include:* Classical theories of optical houses according to idealized types* Measurements for 3 consultant fabrics: magnesium oxide, aluminum, and water* an in depth dialogue of electromagnetic thought* a number of specific and approximate ideas to varied scattering difficulties* Examples and functions from physics, astrophysics, atmospheric physics, and biophysics* a few 500 references emphasizing paintings performed because Kerker's 1969 paintings on scattering idea* desktop courses for calculating scattering by means of spheres, covered spheres, and endless cylinders

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2 Dans toutes les zones iridescentes, les écailles de fond sont structurales et pigmentaires. Elles assurent la coloration et la majorité des effets optiques. 3 Les écailles de recouvrement sont dépigmentées, structurales, parfois atrophiées (Megamedes). 4 Il existe quelques exceptions aux règles précédentes : les Pessonia sont totalement dépigmentés. M. sulkowskyi (Cytheritis) également. 5 Les stries se composent d’un empilement dissymétrique de lamelles (de 1 à 12), d’une centaine de nanomètres d’épaisseur.

La transition structurale - pigmentaire Les espèces du sous-genre Morpho, communément appelées « barrées » sont en effet caractérisées, sur la face dorsale, par une large bande longitudinale bleue iridescente, qui traverse continûment les ailes antérieures et postérieures. Cette bande est plus ou moins large, allant d’un mince filet chez M. achilles, jusqu’à couvrir pratiquement l’intégralité de l’aile chez M. granadensis ou chez certains M. helenor. La transition du bleu au noir est assez progressive.

Comme nous le verrons au chapitre 3, il semble que chez M. sulkowskyi, ces ptéridines se soient substituées aux mélanines et se trouvent à la fois dans les écailles de fond et de recouvrement. 58 Structure des ailes des Morphidae : présentation générale Fig. 21 – Les ocelles de la face ventrale de M. menelaus occidentalis. Les cercles rouges des ocelles sont dus à un ommochrome. On trouve au centre des ocelles quelques écailles structurales de même qu’à leur périphérie. Localisation des pigments Lorsqu’elles coexistent, les couleurs d’origine pigmentaires sont souvent masquées par les couleurs structurales.

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