Irreducible Tensors of the Point Groups with Fivefold Rotational Axes

In order to interprete vibrational spectra of crystals (IR-absorption, IR-reflection, Raman- and Hyper-Raman-scattering, stimulated Raman scattering, and CARS) irreducible tensors of rank 1 to 3 are needed for the 32 classical crystallographic point groups. The detection of quasi-crystals suggested it as useful to calculate these irreducible tensors also for the point groups with fivefold rotational axes. The form of irreducible tensors of rank 1 to 4 without intrinsic symmetries are given in tables for all irreducible representations of pentagonal point groups 5, 5, 10, 10m2, 52, 5m, 52m and for two icosahedron point groups 235 and (2/m) 35

IMPROVEMENT OF RESOLUTION IN RAMAN SPECTRA OF LIQUIDS AND SOLIDS BY He-Ne-LASER EXCITATION

Author Institution: Sektion, Physik der Universit\""atA photoelectrically recording Raman spectrometer with a 60 m W He-Ne laser as light source will be described. It is used for the registration of Raman spectra of crystal powders, including colored substances, liquids and solutions. The resolution of the spectra is superior to that obtained previously with mercury excitation. Examples will be given for azobenzene pellets, carbon tetrachloride and carbon disulfide. In the latter case it is now possible to recalculate the intensity ratio of fundamental and overtone from the intensities of the Fermi-resonance components