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    How does this work all i know is it is a non radiative decay so no photon given off so how does the molecule go from excited to ground state?? and how does it cross between 2 states which have the same energy?
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    It's important that you know the distinction between vibrational and electronic energy levels.
    Electronic energy levels are widely spaced and each electronic state has many possible vibrational levels (by use of the Born Oppenheimer approximation) so, the electronic ground state has many vibrationally excited states available.

    When you undergo internal conversation, a low vibrational level of the electronic excited state transitions into a highly vibrationally excited state of the electronic ground state, so electronic energy is converted into vibrational energy, the product can then relax to the vibrational ground state (by collision in solution for example)

    worth noting we are talking purely about singlet states here, so transition is spin allowed, the equivalent spin forbidden radiationless transition is called inter system crossing.

    Look up a Jablonski diagram for more info


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