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TAKESHI OKA, Department of Chemistry, The University of Chicago, Chicago, IL 60637.
Because of the weak intermolecular interactions, molecular rotations and vibrations are nearly free in para-H2 crystals, and their quantum states have long relaxation times. Vibration-rotation transitions appear extremely sharp with line widths that are smaller than those of gaseous lines by one to two orders of magnitude ( 
/ ~ 10-7 - 10-8). We can thus conduct high resolution spectroscopy and study solid states with unprecedented accuracy and clarity. I will discuss pure rotational (e.g. J=6 <- 0), pure vibrational (v=1 <- 0, J=0 <- 0), and vibration- rotation pair transitions with emphasis on qualitative and quantitative difference between solid and gaseous spectroscopies.