Knowledge Bank

Using a high resolution Fourier transform spectrophotometer (BOMEM), my colleagues consisting of Sang Young Lee, Tae Won Noh, Sung-IK Lee, John P. Golben, and Robert D. McMichael have obtained the spectra of solid and liquid HD from 400 $cm-1$ and 12,000 $cm-1$. In the solid phase, the intensities of several zero-phonon transtions and those of the accompanying phonon branches were measured. In the liquid phase, the zero-phonon transtitions were slightly weaker than those of solid phase. In addition, the first and second vibrational overtone transitions of molecular $D2$ in the solid ann liquid phases have been observed between 400 cm and $9500cm-1$. The transparent solid crystals were grown from ortho, para and normal $D2$ to a length 2.6 cm inside the cell. The pure vibration-rotation transitions in the first overtone of the solid phase were accompanied by the phonon branches. In the liquid phase, the zero-phonon transitions were slightly weaker than those of the solid phase. The much weaker lines of the second overtone were also observed by increasing the signal to noise ratio using several methods. The two sets of experiments will be discussed in this talk.