  We have investigated the impact of microsolvation on the shape resonance
states of nucleobases, taking cytosine as a case study. To characterize the
resonance position and decay width of the metastable states, we employed the
newly developed DLPNO-based EA-EOMCCSD method in conjunction with resonance via
Pad\'e approximation. Our calculations show that the presence of water
molecules causes a red shift in the resonance position and an increase in the
lifetime for all three resonance states. Furthermore, the lowest resonance
state in isolated cytosine was converted to a bound state in the presence of an
aqueous environment. The calculated results are extremely sensitive to the
basis set used for the calculations.
