The calculations are done in the following way. As an initial guess for the EOM-CCSD optimization calculations, we use the result from time-dependent density functional theory(TD-DFT) obtained using the B3LYP hybrid functional and the augmented correlation-consistent valence triple-ζ (aug-cc-pVTZ) atomic orbital basis set. The EOM-CCSD calculation is carried out using the same aug-cc-pVTZ atomic orbital basis set. The ground state energy, frequency and geometry is obtained using the CCSD method with aug-cc-pVTZ basis set to be consistent with the EOM-CCSD calculations. The oscillator strength, which determines the strength of the optical transition, is computed between the ground electronic state and all of the excited states to identify strong electronic transitions. For the molecules of interest, the first 35 excited electronic states are computed using Gaussian16 package. This provides an effective cut off energy of approximately 11 eV, which corresponds to a minimum absorption wavelength of 112 nm, thereby covering the VUV range of wavelengths for radiation.