Knowledge Bank

The infrared and Raman spectra of PbO vapor co-condensed with excess $N2$ and Ar on a cold substrate ( $\sim$ 12K) were investigated. The spectral changes accompanying the heat treatment (controlled warming for a specified period) of the sample were utilized to decipher the vibrational frequencies of monomeric and polymeric specied. Normal coordinated treatment of the data enabled us to clucidate the structures of dimeric trimeric and polymeric species. Normal coordinate treatment of the data enabled us to species. A comparison with the results of SiO suggests different mechanisms of condensation in the two cases which will be discussed in this report.