Abstract

Fano profiles are caused by the interference between the discrete states and continuum. It is a very common phenomenon
in multi-electron Rydberg states, such as the Rydberg states of group II elements in the periodic table. It often leads to
autoionization due to the fact that a discrete state couples with an autoionizing state. Unlike the typical asymmetric line
shape, here we report a symmetric unusual Fano line shape that has been predicted. In addition, this profile is caused
by molecular states or polymer states instead of multi-electron atomic states. Moreover, it is shown that the fano profile
caused by the multi-electron polymer states does not necessarily lead to autoionization. We propose that the Fano profile
studied is caused by the interference between discrete levels and the multipole-multipole coupled continuum, or energy
band.

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