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Electronic spectra and structure of 1- and 2-fluoronaphthalene impurity centers in crystalline naphthalene
Low Temperature Physics ( IF 0.8 ) Pub Date : 2021-05-25 , DOI: 10.1063/10.0004237
M. D. Curmei 1 , V. I. Melnyk 1 , G. V. Klishevich 1 , T. V. Bezrodna 1 , V. V. Nesprava 1 , O. M. Roshchin 1
Affiliation  

The results of experimental investigations on the low-temperature fluorescence and absorption spectra of the 1- and 2-fluoronaphthalene impurities in the crystalline naphthalene are presented and analyzed. When the 1- and 2-fluoronaphthalene concentrations are less than 1%, the absorption and fluorescence spectra are shown to be composed of two identical band series, induced by the formation of two different centers, consisting of the single impurity molecules. The impurity concentration increase of over 1% results in the appearance of the additional structure in the polarized absorption spectra near the 0-0 bands of the single centers in a form of narrow bands with similar intensity and different polarization. This structure is associated with a formation of impurity paired centers, consisting of the two resonantly interacting molecules of either 1-fluoronaphthalene, or 2-fluoronaphthalene. Besides, in the case of the 2-fluoronaphthalene, the absorption spectra contain intense peaks, located ∼ 45 cm−1 higher in frequency, relative to the 0−0 transition bands for each single-center, and consisted of complexes of narrow lines. These spectral peaks are also explained by a formation of impurity paired centers, but here interactions between the molecules are not resonant. For the pure naphthalene crystal factors, causing the observation of additional oppositely polarized weak bands in the absorption spectra at ∼ 10 cm−1 near the Davydov doublet components, are described.

中文翻译:

结晶萘中 1- 和 2- 氟萘杂质中心的电子光谱和结构

介绍并分析了结晶萘中 1- 和 2- 氟萘杂质的低温荧光和吸收光谱的实验研究结果。当 1- 和 2- 氟萘浓度低于 1% 时,吸收和荧光光谱显示由两个相同的带系列组成,这是由两个不同中心的形成引起的,由单个杂质分子组成。杂质浓度增加1%以上导致单中心0-0带附近的偏振吸收光谱中以强度相似、偏振不同的窄带形式出现附加结构。这种结构与杂质配对中心的形成有关,由 1-氟萘或 2-氟萘的两个共振相互作用分子组成。此外,在 2-氟萘的情况下,吸收光谱包含强峰,位于 ~ 45 cm-1频率更高,相对于每个单中心的 0-0 过渡带,由窄线复合体组成。这些光谱峰也可以通过杂质配对中心的形成来解释,但在这里分子之间的相互作用不是共振的。对于纯萘晶体因素,描述了在 Davydov 双峰分量附近的约 10 cm -1处的吸收光谱中观察到额外的相反极化弱带。
更新日期:2021-05-28
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