- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Determination of the first ionization energy of polonium by resonance ionization spectroscopy – Part II: Measurement of odd-parity Rydberg states at CERN–ISOLDE
摘要： Polonium (Po) is one of the rarest elements in Earth's crust. None of its isotopes are stable and sufficient amounts for systematic experimental studies of its most fundamental properties are only available by artificial production. At the radioactive ion beam facility ISOLDE at CERN, 208Po was produced by proton-induced spallation of uranium. Using the technique of in-source Resonance Ionization Spectroscopy the ionization threshold was probed with a tunable dye laser. A spectrum of 110 previously undocumented odd-parity Rydberg states was observed. Applying the Rydberg formalism to the data enabled the determination of the first ionization energy of polonium as 67896.310(14)(30) cm?1 or 8.4180700(18)(37) eV. This is a precision improvement of more than 600 over the existing literature value. A comparison with the homologous elements sulfur, selenium and tellurium enabled the assignment of the electron configuration of the resonances found in the spectrum.
关键词： Rydberg series,Polonium,Resonance ionization spectroscopy,Ionization potential,Ionization energy
更新于2025-09-19 17:15:36
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31.4: <i>Invited Paper:</i> Recent Development of Soluble Hole Injection Material for Printed OLED and QLED Display
摘要： We are developing the soluble hole injection materials and the inks, named ELsource? that can be used as hole injection layer in OLED display. OLED display is one of optical device. Therefore, we developed the hole injection materials with optical properties necessary for that optical devices. We also developed the hole injection material with the deeper ionization potential applicable to QLED display.
关键词： Hole injection layer,Ionization potential,HIL,Refractive index,HIM,Printed,OLED,Optical property,Hole injection material,QLED,Soluble
更新于2025-09-19 17:13:59
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Selective negative-ion formation from core-valence doubly excited states of the water molecule
摘要： This study focuses on the role of negative-ion formation in the decay of core-valence doubly excited water molecules. Combining negative- and positive-ion coincidence measurements with calculated energies of core-valence doubly excited states, we find that O? and H? production is enhanced selectively. In particular, we suggest that O? production is correlated to double occupancy of the antibonding 4a1 virtual orbital, while H? appears at electronic states with double occupancy in 2b2. We also show that H? and O? can be created as a result of electron recapture close to the O 1s ionization potential.
关键词： core-valence doubly excited states,electron recapture,negative-ion formation,water molecule,O 1s ionization potential
更新于2025-09-09 09:28:46
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A review on low-molar-mass carbazole- based derivatives for organic light emitting diodes
摘要： Organic light emitting diodes (OLEDs) have attracted a great deal of attention within academia and industry because of their potential applications in flat panel displays and solid-state lighting technologies. Among all low-molar-mass derivatives under investigation in OLEDs field, carbazole-based materials have been studied at length for their interesting physical properties, including good charge injection and transport, electro-luminescence, improved thermal and morphological stabilities as well as film forming properties. In addition, the relatively high triplet energy level of some substituted carbazoles makes them suitable candidates to design hosts for wide bandgap triplet emitters such as blue dopants. The article is written from structural organic chemist's point of view and is divided in several parts: V-shaped 3(2)-substituted carbazoles and derivatives with 9-carbazolyl rings, star-shaped 3,6(2,7)-substituted carbazoles and branched twin derivatives containing (di)arylcarbazolyl fragments.
关键词： Amorphous material,Ionization potential,Glass transition temperature,Organic light emitting diode,Substituted carbazole,Hole transporting material
更新于2025-09-09 09:28:46