In this report, we have focused our attention to the lifetime measurements involving nS and nD states, which were presented in theprevious report. We have observed that there was a discrepancy between theory and experiment performed at T300 K. We havedeveloped a theoretical model, which considers the finite size of the vacuum chamber. Such effect modifies thespectrum of the blackbody theory, reducing its influence, and therefore increasing the lifetime. Such observation may be importantwhere a larger lifetime is desired, but the use of cryogenic techniques is not possible. We have also investigated the excitation ofRydberg states using Laguerre-Gauss laser beams in dipole prohibited transition. In particular, we are interestedin transitions from the 5P32 to the nP Rydberg state. We believe that we could not observed them due to the low densityvolume ofthe sample.