Accession Number : AD0690211

Title :   A STUDY OF OPTICAL ABSORPTION SPECTROSCOPY FROM METASTABLE EXCITED STATES OF TRANSITION METALS IONS IN CRYSTALS.

Descriptive Note : Final rept. 9 Mar 65-8 Mar 69,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF PHYSICS

Personal Author(s) : Moos,H. W.

Report Date : MAY 1969

Pagination or Media Count : 16

Abstract : The research was primarily concerned with the energy levels of ions in crystals. In particular, the use of techniques involving absorption from excited states were explored. These techniques are useful in two ways. First, due to selection rules many excited states cannot be observed by absorption transitions from the ground state but are observable from metastable excited states. Thus there are large numbers of non-fluorescing levels which can be measured only in this way. This is of special importance in laser materials where absorption from the upper state will decrease the gain. Secondly, there are many infrared levels of ions in crystals which are especially difficult to study. Not only are infrared techniques less sensitive, but the spontaneous emission rate decreases. Thus, absorption from these levels is the best way to measure the lifetimes of these levels, monitor energy transfer, etc. (Author)

Descriptors :   (*CRYSTALS, *ATOMIC ENERGY LEVELS), (*CRYSTAL DEFECTS, ABSORPTION SPECTRA), TRANSITION METALS, IONS, OPTICAL MATERIALS

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE