Vibronic Theory of the Stark Effects on the Relaxed Excited State of the F Center

Imanaka, Koichi; Iida, Takuya; Ohkura, Hiroshi

doi:10.1143/jpsj.43.519

Cited by 39 publications

(13 citation statements)

References 16 publications

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“…So, we needed to impose two restrictions on E s ðQÞ; E x;ðyÞ ðQÞ and E z ðQÞ in the vicinity of their minimum points, in order to ultimately determine them by using the results of the mixing parameters a 2 1 and a 2 2 : The 2s-2p separation D in the RES of the F center in KCl can be used as one of the restrictions, since the relaxation process for the F A2 band excitation is very similar to that in the F center in KCl. We set the difference between the minimum values of E x;ðyÞ ðQÞ and E s ðQÞ to be equal to D; which is 33:5 meV [19], and place the other restriction on E z ðQÞ by assuming that E z ðQÞ takes the same minimum value as that of E s ðQÞ at the same point. Under these reasonable conditions, we used the following relation between a 2 1 (or a 2 2 ) and the adiabatic potential energies, where X i ¼ ½E i ðQÞ À E s ðQÞ=j2V sp;i j: Here, i ¼ 1 and 2 correspond to F A1 and F A2 band excitation, respectively; E 1 ðQÞ and E 2 ðQÞ stand for E z ðQÞ and E x;ðyÞ ðQÞ; respectively; and V sp;i is an interaction parameter for the 2s-2p mixing.…”

Section: Article In Pressmentioning

confidence: 99%

“…(2) has been derived from a semiclassical calculation where the mixing interaction between 2s and 2p states is assumed to be constant [11]. Under the conditions E s ð0Þ ¼ 2:36 eV; E x;ðyÞ ð0Þ ¼ 2:25 eV [7], O x ¼ 1:87 eV; D ¼ 33:5 meV [19], and by taking V sp;2 as a free parameter, we have firstly determined E s ðQÞ and E x;ðyÞ ðQÞ so as to reproduce the O-dependence of a 2 2 deduced from the experiment. The best fitting represented with a broken line in Fig.…”

Section: Article In Pressmentioning

confidence: 99%

See 1 more Smart Citation

Vibronic relaxation processes of FA centers in KCl:Li

Akiyama

Muramatsu

Arai

et al. 2004

Journal of Luminescence

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Section: Article In Pressmentioning

confidence: 99%

Section: Article In Pressmentioning

confidence: 99%

Vibronic relaxation processes of FA centers in KCl:Li

Akiyama

Muramatsu

Arai

et al. 2004

Journal of Luminescence

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“…For the sake of completeness we will add the following terms, W -N G -W+nG and WEflR -WTnR in the right-hand side of (26) …”

Section: Appendixmentioning

confidence: 99%

Theory for the Magnetic Circular Polarization of the F‐Center Luminescence

Iwahana

1985

Physica Status Solidi (b)

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A simple theoretical model is developed for the magnetic circular polarization (MCP) of the Fcenter luminescence on the basis of a vibronic theory. I n this model new rate equations for the optical pumping cycle are proposed t o describe the unthermalized spin systems a t low temperatures. It is shown that the model can consistently explain the unusual dependences of the MCP upon the magnetic field and temperature which are observed in the low temperature region. From the analysis of the temperature dependence of the MCP, A~c p ( 2 7 ) , in the high temperature region, it is found that one must have A > 2 as far as V , 5 0.6 to account for the nearly temperature independent behaviour of d~c p ( T ) in KCI in contrast to A < 2 given previously from the analysis of the temperature dependence of the radiative lifetime. It is pointed out that the discrepancy may be reconciled if assuming that the contribution t o d~c p ( T ) of the field-induced level splitting in the adjacent excited states is negligibly small.Ein einfaches Modell fur die magnetische Zirkularpolarisation (MCP) der F-Zentren-Lumineszenz auf der Basis der 'vibronic theory' wird entwickelt. I n diesem Modell wird die Generationsrate des optischen Pump-Prozesses neu formuliert, um Spinsysteme, die sich bei niedrigen Temperaturen nicht im thermischen Gleichgewicht befinden, zu beschreiben. Dieses Modell ist in der Lage, die ungewohnliche Magnetfeld-und Temperaturabhangigkeit der MCP, welche bei niedrigen Temperaturen auftritt, folgerichtig zu erklaren. Ans der Analyse der Temperaturabhangigkeit der MCP, A*ICP(T), bei hoheren Temperaturen wird gezeigt, da13 A > 2 sowie V , 0,6 sein muB, um das fast temperaturunabhiingige Verhalten von AMCP( T ) in KCl zu erhalten, im Gegensatz zu A < 2, welches aus der Analyse der Temperaturabhangigkeit der ,radiative lifetime' abgesrhatzt wird. Es wird gezeigt, daB man diesen Widerspruch dadurch beseitigen kann, indem man annimmt, daB der Beitrag der feldinduzierten Niveau-Aufspaltung in den benachbarten angeregten ZustLnden zur AYCP(T) vernachliissigbar ist.

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“…1. In the FCS, the 2p state is lower than the 2s state [10], but in the RES, the 2p state lies above the 2s state [11]. Thus, the 2s and 2p levels cross each other between the FCS and RES.…”

Section: Introductionmentioning

confidence: 98%