Recently, a theoretical and experimental study was presented that explains many aspects of the spin dynamics associated with the three microwave chirped pulse experiments , and provides the impetus for the results presented here. In particular, the ISE utilizes a broad µw frequency sweep through both the forbidden SE double quantum (DQ) and zero quantum (ZQ) matching conditions, e.g. with µw frequency offset chirping from -∞ to ∞ (in practice slightly wider than ±ω !" ). In contrast, both the SSE and ASE sweep through only one of the SE matching conditions. The SSE uses a broad sweep terminating at the EPR center e.g. a sweep from -∞ to 0, while the ASE uses a narrow sweep around one of the SE matching conditions at ω !& ± ω !" . To compare the different approaches, we define the polarization transfer ratio E as the gain of the nuclear polarization induced by each DNP pulse, Δ𝑃 " , over the difference between the initial electron and nuclear polarizations, 𝑃 & ! -𝑃 " ! . Expressions of the polarization transfer ratios for sweeping over a single SE matching condition, ESSE (for the SSE and ASE), and both matching conditions, EISE (for the ISE), were derived using the Landau-Zener theory and are