Radicals produced by illumination or ionizing radiation are often produced in pairs, which quickly decay by recombination or by diffusion and subsequent reaction. For studying reaction pathways and optimizing the yield of radical pair products it is desirable to minimize the probability of charge recombination. We present here a method based on simple radical pair theory to effectively prolong the Lifetime of radical pairs that are formed from an excited singlet state by manipulating the population of energetically isolated radical pair tripler levels. Two experimental schemes are discussed and demonstrated on the secondary radical pair of photosynthetic reaction centers. For this system we have achieved an increase in radical pair lifetime of 1-2 orders of magnitude at low temperatures (7 K).