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Optical Properties of Poly(Para‐Phenylenes) under High Pressure
Author(s) -
Guha S.,
Graupner W.,
Yang S.,
Chandrasekhar M.,
Chandrasekhar H. R.,
Leising G.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199901)211:1<177::aid-pssb177>3.0.co;2-k
Subject(s) - hydrostatic pressure , amorphous solid , excited state , materials science , photoluminescence , raman scattering , phenylene , raman spectroscopy , polymer , crystallite , atmospheric pressure , absorption (acoustics) , molecule , molecular physics , chemical physics , chemistry , optics , optoelectronics , crystallography , thermodynamics , atomic physics , composite material , physics , organic chemistry , metallurgy , meteorology
We present optical studies using photoluminescence, absorption and Raman scattering on samples from two generic families, the polycrystalline para‐phenylene oligomers and the amorphous para‐phenylene polymers, under hydrostatic pressure. These studies have provided insight into the geometry of the molecules, and the fundamental properties of the ground and excited states of these materials. Using our measurements under pressure and a simple model we extract atmospheric pressure values for the shift in the configuration coordinate between ground and excited states and the ratio of force constants describing the potential wells that describe these states.