Department;
of;
Chemistry,;
Beijing;
Normal;
University,;
Beijing;
100875,;
China;
College;
of;
Environment;
and;
Energy;
Engineering,;
Beijing;
Polytechnic;
University,;
Beijing;
100022,;
China;
Department;
of;
Chemistry,;
Beijing;
Normal;
University,;
Beijing;
100875,;
China;
Department;
of;
Chemistry,;
Beijing;
Normal;
University,;
Beijing;
100875,;
China;
RRKM; theory,; rate; constant,; microcanonical; variational; transition; state; theory,; direct; ab; initio; dynamics,; tunneling; effect.;