INFRARED SPECTRA OF THE n-PROPYL AND i-PROPYL RADICALS IN SOLID PARA-HYDROGEN

We report the infrared spectra of the textit{n}-propyl and textit{i}-propyl radicals measured in solid para-hydrogen (textit{p}-chem{H_2}) matrices at 3.2 K. textit{n}-Propyl and textit{i}-propyl radicals were produced via the 248 nm irradiation of matrices formed by co-depositing textit{p}-chem{H_2} and either 1-Iodopropane (textit{n}-propyl) or 2-Iodopropane (textit{i}-propyl). Secondary photolysis was used to group spectral lines all due to the same species. Lines in the C-H stretching region were compared to previous work using the Helium Nanodroplet Isolation (HENDI) technique,footnote{Peter R. Franke, Daniel P. Tabor, Christopher P. Moradi, Gary E. Douberly, Jay Agarwal, Henry F. Schaefer III, and Edwin L. Sibert III, textit{Journal of Chemical Physics} textbf{145}, 224304 (2016).} and are in excellent agreement. In addition to a few lines previously measured in Ar matrices, we observe many previously unreported bands below 2000 wn, which we attribute to the textit{n}-propyl and textit{i}-propyl radicals. The assignment of features below 2000 wn are made via comparisons to anharmonic VPT2+K frequency computations