Visual summary of the Redhead-TST method. The pre-exponential frequency factor (ν) is determined with Transition State Theory (TST). The main input are the translational () and rotational () partition functions, which increase as the molecule transitions from a solid to gaseous state, and T_peak of the molecule. The Redhead equation takes T_peak, the heating rate, and v_TST as the main inputs to calculate the desorption energy, E_des.