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Electronic excited state and the phenomena of photo‐induced polarization and depolarization
Author(s) -
Prakash J.
Publication year - 1982
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/pssb.2221140107
Subject(s) - excited state , depolarization , dipole , pid controller , relaxation (psychology) , activation energy , ground state , polarization (electrochemistry) , physics , atomic physics , chemistry , quantum mechanics , thermodynamics , neuroscience , psychology , biophysics , temperature control , biology
That the activation energy for the orientation of impurity—vacancy dipoles in the electronic excited state (ees) should be less than that required in the electronic ground state (egs) is not the sufficient condition for the occurrence of PIP and PID. It is observed that the activation energy is not the only parameter which controls the occurrence of PIP and PID. The fundamental relaxation time also participates in deciding the situations in which PIP and PID take place. The necessary condition found, is that the product of the activation energy and the fundamental relaxation time in ees should be less than the corresponding value in egs.