<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>F</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Center in NaF

Stiles, L. F.; Fitchen, D. B.

doi:10.1103/physrevlett.17.689.2

Cited by 26 publications

(7 citation statements)

References 8 publications

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“…It is believed that the excitation peak energy corresponds to the energy of the upper triplet state 3A, which is measured from the ground state 'A,. Thus, we have confirmed the previous suggestion [6] that the 3A, level is located at the high-energy side of the singlet excited level 'E. Moreover, it is concluded that the 3A, state has the same parity as the 'A, state.…”

Section: Resultssupporting

confidence: 91%

Two‐Photon Excitation to the High‐Lying Triplet State of F Color Centers in LiF Crystals

Ter-Mikirtychev

Tsuboi

1995

Physica Status Solidi (b)

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The excitation spectrum for the anti-Stokes luminescence band with a peak at 538 nm, which arises from the electronic transition of the singlet excited state 'E to the ground state 'A, in F i centers of LiF crystals, is obtained for the first time using the first harmonic radiation of a tunable A1,03 : Ti3+ laser. From the quadratic dependence of the luminescence intcnsity on the average pumping power, the luminescence is understood to be caused by two-photon excitation from the ground state 'A, to the triplet state 3A,.

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Section: Resultssupporting

confidence: 91%

Two‐Photon Excitation to the High‐Lying Triplet State of F Color Centers in LiF Crystals

Ter-Mikirtychev

Tsuboi

1995

Physica Status Solidi (b)

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“…The symmetry axis of the centre is directed along the [lll] axis of the crystal. From the results of optical dichroism experiments [4] it is possible to conclude that the ground state is nondegenerate, i.e. it has A,-symmetry.…”

Section: Model Of the R+-centrementioning

confidence: 96%

Theoretical Studies on the F‐Centre in Alkali Halides

Ėvarestov

Treiger

1969

Physica Status Solidi (b)

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The results of the theoretical study of I he electronic states of the R+-centre in alkali halides are reported. No empirical parameters are used in this calculation. The electronic core polarization is taken into account. The results of the calculation are in satisfactory agreement with the experimental data and can be considered as a theoretical confirmation of the F;-model of the R+-centre. B pa6o~e M~J I~~~I O T C I Ipe3ynt~a~h1 TeopeTmecKoro paccMoTpeHm a n e~~p o r r -HOB CTpymyphi R+ UeHTpa R uenoworanonzHbx KpneTannax. Hmamie 3~nl1-pwecmie napaMeTpbr B pacseTe IIe ~c n o n i~i y m~c~~. YVsaTbIsaercR s n e~~p o~r r a n IlOJl~~l43aIWIJI HOHOB OCTOBa. Pe3YJIbTaTbI PaCveTa y~OBJIeTBOpHTe~bI10 COrJlaCyIOTCH C 3IiC~ePHMelITaJ1hIIhIMIl AaHHbIMH H MorYT paCCMaTpnBaThCH HBK TeOpeTH9ecKoe IIoATBepXHeHHe F:-ivoaenm R ' -l i e~~p a . Model of the R+-CentreUnder X-ray irradiation and exposure to light of appropriate frequency the F-aggregate centres in alkali halides can be ionized. I n this process charged centres (FZ, F3+) are generated from neutral aggregate centres (F2, F3) All these results give support for choosing as model of the Rf-centre a n aggregate of three adjacent negative-ion vacancies with two electrons localized on them.which the transition t>akes place ;

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“…The strong electron-phonon interaction in these centers results in broad emission bands. Probably, the best studied are the aggregate luminescent centers in LiF (see [14] for review) and NaF [15] crystals. Color centers in LiF crystals were studied in detail because these crystals were used as a medium for tunable solid state lasers [11][12][13] and other applications.…”

Section: Color Centers In Alkali Halide Crystalsmentioning

confidence: 99%

“…1 the fluorescence spectra of X-ray irradiated NaF crystals containing F 3 + aggregate centers [15] under the excitation at different wavelengths are shown. The fluorescence spectra shape does not depend on excitation wavelength.…”

Section: Color Centers In Alkali Halide Crystalsmentioning

confidence: 99%