Local angular momentum-local impact parameter analysis:A new tool for understanding structure in the angular distributions of chemical reactions

摘要

A local angular momentum (LAM) and a local impact parameter (LIP) is defined for a state-to-state reaction,whose scattering amplitude can be expanded in a Legendre partial wave series.A nearside- farside decomposition is incorporated into the LAM-LIP theory,which is also extended to resummed partial wave series.The input to a LAM-LIP analysis consists of a set of accurate,or approximate,quantum scattering matrix elements.Application is made to the benchmark F+H_2(v_1=0,j_i=0,m_i=0)->FH(v_f=3,j_f=3,m_f=0)+H reaction,where v_i,j_i,m_i and v_f,j_f,m_f are initial and final vibrational,rotational and helicity quantum numbers respectively.It is demonstrated that a LAM-LIP analysis of structure in the angular scattering provides valuable information on the dynamics of chemical reactions.