Exploring the methane combustion reaction: A theoretical contribution
Peng Ya, Jiang Zhong-An, Chen Ju-Shi
       

(color online) The two imaginary frequency modes of the secondary order saddle point SP2nd (3E) between SP1st (3A′) and SP1st (3A″). Mode I: 2519 cm−1 for the transfer of a hydrogen atom; Mode II: 262 cm−1 for the OHC bending.