Abstracts 2000

Abstract of Publication No. 371

F. Rodriguez, D. Hernández and H. U. Güdel
Evidence of Mn2+-Mn2+ Double Excitation Transitions in NH4MnCl3 by Pressure Spectroscopy
in "Science and Technology of High Pressure", Proceedings of AIRAPT-17, edited by M. H. Manghnani, W. J. Nellis and M. F. Nicol
Universities Press, Hyderabad, India, 2, 987-990 (2000)      Full Text (PDF)     

Abstract: Double excitation (DE) transitions are investigated in NH4MnCl3 microcrystals by high-pressure optical spectroscopy. Two intense bands observed at 39200 and 42200 cm–1 in the UV absorption spectrum at room temperature are reported for the first time. The bands are assigned to the DE transitions 4T1g + 4T1g and 4T1g + 4A1g4Eg on the basis of their pressure dependence. Apart from the DE energy as sum of the corresponding single excitation (SE) energies, the proposed assignment is clearly confirmed through the pressure shift rates. This procedure enables us to discard any other overlapping SE and DE transitions as responsible for the observed bands.

Last modified: 13.12.11 by Gabriela Frei