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Examples of data contained in the JPDOC

Most of the materials studied in Jena are synthetic compounds prepared especially for the purpose of spectroscopic investigation. They include silicates in both amorphous and crystalline state, oxides of magnesium, iron, and aluminum, sulfides, and carbon in different forms. Chemical and physical analytical methods were generally applied to confirm the homogeneity, composition, and crystal structure of the products prior to the spectroscopic measurements. Further, some natural crystals (oxides and silicates) have been included in the studies. If necessary, data have been determined for the different crystallographic axes. For part of the compounds, data are available at cryogenic temperatures. A summary of the data currently available is given in Table 1. In the following we give some examples of the data and their possible applications.

Table: Summary of data measured in the Jena laboratory, which are currently available from the JPDOC.

compound	composition	cryst. state	spectral range	data sets	at 10K
silicates	(Mg,Fe)SiO$_3$,	glassy	UV/VIS/IR	10	1
	(Mg,Fe)$_2$SiO$_4$
	MgSiO$_3$,	cryst.	IR	2	1
	(Mg,Fe)$_2$SiO$_4$
	MgSi$_x$O$_y$	amorph.	UV/VIS/IR	5	1
	(Ca,Al,Mg,Fe)Si$_x$O$_y$	amorph.	IR	13
sulfides	(Mg,Fe)S	cryst.	IR	5	1
	SiS$_2$	cryst.	IR	1
oxides	(Mg,Fe)O	cryst.	UV/VIS/IR	6	1
	Al$_2$O$_3$	amorph.	IR	2
	(Mg,Al)O$_x$	cryst.	IR	8
carbon	a-C:H	amorph.	UV/VIS/IR	6