Institute of Atomic and Molecular Physics;
Sichuan University;
Chengdu 610065;
China;
College of Materials Science and Engineering;
Chongqing Jiaotong University;
Chongqing 400074;
China;
Institute of Finance&Trade;
Chongqing City Management College;
Chongqing 401331;
China;
Science and Technology on Surface Physics and Chemistry Laboratory;
P.O.Box 718-35;
Mianyang 621907;
China;
covalent; bonding; magnetism; Hubbard; ionic; constants; narrow; bonds; modulus; systematically;