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Abstrak :
INTISARI
Sampel polietilena dan polipropilena yang berupa slab diperiksa dengan XRD (x-ray diffraction). Dari data sudut difraksi (2θ) diperoleh bahwa sistem kristal polietilena ternyata orthorombik dengan konstanta kisi untuk PELL0209SR adalah a=7,515 Å, b=4,913 Å dan c=2,495 Å dan untuk PEFID5710AA a=7,438 Å, b=4,914 A dan c = 2,485 A, sedangkan sistem kristal polipropilena berupa monoklinik dengan konstanta kisi baik untuk PPF600 maupun PPJ600 berharga sama, yaitu: a=6,652 Å, b = 20,964 Å, c = 6,499 Å. dan ß= 99,20°. Fungsi Patterson untuk kedua kristal ini diperoleh dari data intensitas yang telah dikoreksi. Dari hal ini kontur fungsi Patterson dapat dikonstruksi dan kemudian gambar susunan atom-atom Carbon dalam tiga dimensi dapat dibuat-Jarak antar atom C, sudut tekuk dan jarak antar serat (milar) dapat diperoleh.

Abstrak :
The book is a comprehensive edition which considers the interactions of atoms, ions and molecules with charged particles, photons and laser fields and reflects the present understanding of atomic processes such as electron capture, target and projectile ionisation, photoabsorption and others occurring in most of laboratory and astrophysical plasma sources including many-photon and many-electron processes.

Abstrak :
The aim of this book is to present highly accurate and extensive theoretical atomic data and to give a survey of selected calculational methods for atomic physics, used to obtain these data. The book presents the results of calculations of cross sections and probabilities of a broad variety of atomic processes with participation of photons and electrons, namely on photoabsorption, electron scattering and accompanying effects. Included are data for photoabsorption and electron scattering cross-sections and probabilities of vacancy decay formed for a large number of atoms and ions. Attention is also given to photoionization and vacancy decay in endohedrals and to positron-atom scattering. The book is richly illustrated. The methods used are one-electron Hartree-Fock and the technique of Feynman diagrams that permits to include many-electron correlations. This is done in the frames of the Random Phase approximation with exchange and the many-body perturbation theory. Newly obtained and previously collected atomic data are presented. The atomic data are useful for investigating the electronic structure and physical processes in solids and liquids, molecules and clusters, astronomical objects, solar and planet atmospheres and atomic nucleus. Deep understanding of chemical reactions and processes is reached by deep and accurate knowledge of atomic structure and processes with participation of atoms.