Daniel L. Ross

Organic recording medium for volume‐phase holography

A new organic recording medium for volume‐phase holography is described. Holograms can be read out nondestructively at the recording wavelength and power. Self‐erasure may also be obtained. Holographic data and the effect of structure on recording and fixing behavior are described. The recording medium may be used to record multiple holograms.

Polarized Absorption and Emission in an Octacoordinate Chelate of Eu3

Polarized absorption in the 5D2←7F0 transition and emission in the 5D0→7F2 transition of the Eu3+ ion have been obtained in monoclinic single crystals of the tetrahexylammonium salt of tetrakis diphenyl‐propanedionoeuropium (III). Both sets of transitions consist of three lines, two polarizing strongly perpendicular to the crystallographic c axis, the third polarizing parallel to this axis. Assuming the propriety of electric‐dipole selection rules, these results are consistent with S4 symmetry for the chelate anion.Polarized absorption in the 5D2←7F0 transition and emission in the 5D0→7F2 transition of the Eu3+ ion have been obtained in monoclinic single crystals of the tetrahexylammonium salt of tetrakis diphenyl‐propanedionoeuropium (III). Both sets of transitions consist of three lines, two polarizing strongly perpendicular to the crystallographic c axis, the third polarizing parallel to this axis. Assuming the propriety of electric‐dipole selection rules, these results are consistent with S4 symmetry for the chelate anion.

Nonpolymeric organic host for recording volume phase holograms

Sucrose benzoate has been used as a host for recording volume phase holograms. Diffraction efficiencies up to 75% are obtained using a variety of photosensitive guests. Fixed or self‐erasing holgrams can be obtained.