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Mahmoud Bakr,R. Kinjo,Y. W. Choi,M. Omer,K. Yoshida,S. Ueda,M. Takasaki,K. Ishida,N. Kimura,H. Zen,T. Sonobe,T. Kii,K. Masuda,H. Ohgaki 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.51
The heating property of LaB_6 and CeB_6 cathodes is investigated against the Back Bombardment (BB) effect in thermionic RF guns using numerical calculation of the stopping range and deposited heat power inside the cathode materials. Then the change in a cathode temperature and corresponding change of current density during 5.5 μs pulse duration are determined by solving two differential equations. The simulation results show that, the change of current density during the macropulse for LaB_6 two times higher than for CeB_6, hence, the effect of the BB electrons in CeB_6 is less than for LaB_6.
Structure and Photoluminescence of ZnS - ZnSe Superlattices Grown by Hot Wall Epitaxy
최용대(Y. D. Choi),S. Sakakibara(S. Sakakibara),K. Ishino(K. Ishino),A. Ishida(A. Ishida),H. Fujiyasu(H. Fujiyasu) 한국진공학회(ASCT) 1994 Applied Science and Convergence Technology Vol.3 No.2
Hot wall epitaxy법에 의하여 GaAs(100)면 위에 ZnS-ZnSe 초격자를 성장하였다. ZnS-ZnSe 초격자의 주기는 x-선 회절 패턴에 의하여 확인되었고, 이것은 변형을 고려하여 계산된 이론적인 패턴과 비교되었다. 경계면에 평행한 ZnS와 ZnSe의 변형의 비는 ZnSe에 대하여 ZnS의 두께가 증가할수록 감소되었다. ZnS-ZnSe 초격자의 photoluminescence(PL)는 고에너지 영역의 예리한 스펙트럼과 저에너지 영역의 폭이 넓은 스펙트럼으로 구성되어 있다. PL의 광자 에너지는 Kronig-Penney 모델을 사용하여 계산된 이론적인 에너지 값과 비교한 결과 type I의 초격자임을 알았다. ZnS-ZnSe superlattices(SLs) were grown on the GaAs(100) by hot wall epitaxy. The period of ZnS-ZnSe SLs grown was confirmed by X-ray diffraction patterns, and compared with the theoretical pattern calculated considering the strain. It was calculated that the strain ratios of ZnS and ZnSe parallel to interfaces are decreased with increasing the ZnS thickness for ZnSe one. The photoluminescence(PL) of ZnS-ZnSe SLs consists of a sharp. line in the high energy region and of broad spectra in the lower energy region. The peak photon energy of ZnS-ZnSe PL was compared with the energy of the theoretical calculations using Kronig-Penney model, and ZnS-ZnSe SLs were considered to be type I.
Ishida, Masatoshi,Kim, Soo-Jin,Preihs, Christian,Ohkubo, Kei,Lim, Jong Min,Lee, Byung Sun,Park, Jung Su,Lynch, Vincent M.,Roznyatovskiy, Vladimir V.,Sarma, Tridib,Panda, Pradeepta K.,Lee, Chang-Hee,Fu Nature Publishing Group 2013 Nature chemistry Vol.5 No.1
Proton-coupled electron transfer (PCET) processes are among the most important phenomena that control a variety of chemical and biological transformations. Although extensively studied in a variety of natural systems and discrete metal complexes, PCET mechanisms are less well codified in the case of purely organic compounds. Here we report that a planar 棺,棺??phenylene-bridged hexaphyrin (1.0.1.0.1.0), a 24 ?-electron antiaromatic species termed rosarin, displays unique redox reactivity on protonation. Specifically, treatment with acid (for example, HI) yields a 26 ?-electron aromatic triprotonated monocationic species that is produced spontaneously via an intermediate??but stable??25 ?-electron non-aromatic triprotonated monoradical dication. This latter species is also produced on treatment of the original 24 ?-electron antiaromatic starting material with HCl or HBr. The stepwise nature of the proton-coupled reduction observed in the planar rosarin stands in marked contrast to that seen for non-annulated rosarins and other ostensibly antiaromatic expanded porphyrinoids.