关注: 1) Extended Hückel method方法的实质; 2) Extended Hückel method在低维材料如纳米材料中的可能应用 The extended Hückel method is a semiempirical quantum chemistry method , developed by Roald Hoffmann since 1963 . It is based on ...
关注: 1) 电负性与得失电子的关系; 2) 如何有效地进行化学键分析 1. Dipole Physics A pair of electric charges or magnetic poles, of equal magnitude but of opposite sign or polarity, separated by a small distance. 【物理学】 偶极子:一对电荷或磁极,符号或极性相反 ...
http://en.wikipedia.org/wiki/Space_group#Notation_for_space_groups International symbol or Hermann–Mauguin notation . The Hermann–Mauguin (or international) notation describes the lattice and some generators for the group. It has a shortened form called the international short ...