نتایج جستجو برای: electron absorption

تعداد نتایج: 429342  

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده علوم 1393

in this thesis, structural, electronical, and optical properties of inverse pervskite(ca3pbo) in cubic phase have been investigated.the calculation have been done based on density functional theory and according to generalized gradiant approximate (gga) as correlating potential. in order to calculate the configurations, implementing in the wien2k code have been used from 2013 version. first of ...

Journal: :international journal of nano dimension 0
g. chandra das department of chemistry, gauhati university, guwahati 781014, assam, india. d. bhuyan department of chemistry, gauhati university, guwahati 781014, assam, india. n. sen sarma physical sciences division, institute of advanced study in science and technology, guwahati-781035, assam, india. o. kumar medhi department of chemistry, gauhati university, guwahati 781014, assam, india.

a new approach for the synthesis of prussian blue nanoparticles using the cationic surfactant cetyl pyridinium chloride (cpc) as capping agent has been developed in the present work. powder x-ray diffraction, transmission electron microscopy, uv–vis absorption spectra, and ir spectroscopy were employed to characterize the product. the tem image showed that the prussian blue nanoparticles with d...

Journal: :journal of sciences islamic republic of iran 0
a. eskandari-asl department of physics, faculty of sciences, university of shahid beheshti, tehran, islamic republic of iran

the one photon absorption (opa) cross section of a current carrying two-orbital quantum dot (qd) with strong electron-phonon interaction (polaron regime) is considered. using the self-consistent non-equilibrium hartree-fock (hf) approximation, we determine the dependence of opa cross section on the applied bias voltage, the strength of effective electron-electron interaction, and level spacing ...

Journal: :international journal of nano dimension 0
a. pourahmad department of chemistry, guilan science and research branch, islamic azad university, guilan, iran.

we report the growth by ion exchange synthesis of zns nanoparticles in mcm-41 matrices using zn (ch3coo)2 and na2s starting sources. the final product (zns/mcm-41) was characterized by x-ray diffraction (xrd) pattern, transmission electron microscopy (tem), scanning electron microscopy (sem), infrared spectrometry (ir) and uv-vis spectroscopy. its crystalline structure and morphology was studie...

 Cascade dynamics of kaonic nitrogen atom (K-N) in a gaseous target was simulated using a simple model. In this model the radiative transitions, internal Auger, K-electron refilling, nuclear absorption, and kaon decay processes were included. The effect of the K-electron refilling process on some of quantities of cascade dynamics such as X-ray yields, the averaged K-electron shell number, fract...

A. Eskandari-asl

The one photon absorption (OPA) cross section of a current carrying two-orbital quantum dot (QD) with strong electron-phonon interaction (polaron regime) is considered. Using the self-consistent non-equilibrium Hartree-Fock (HF) approximation, we determine the dependence of OPA cross section on the applied bias voltage, the strength of effective electron-electron interaction, and level spacing ...

1999
D. H. Rich K. Rammohan F. J. Grunthaner

We have examined the effects of electron-hole plasma generation on excitonic absorption phenomena in nipi-doped In&&,sAs/GaAs multiple quantum wells (MQWs) using a novel technique called electron beam-induced absorption modulation imaging. The electron-hole plasma is generated by a high-energy electron beam in a scanning electron microscope and is used as a probe to study the MQW absorption mod...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2014
ahmad irfan

ground state geometries have been computed using density functional theory (dft) at b3lyp/6-31g(d,p) level of theory. the excitation energies and spectroscopic parameters have been computed using long range corrected (lc) hybrid functional by time dependent density functional theory (tddft) with lc-blyp level of theory. the polarizable continuum model (pcm) has been used for evaluating bulk sol...

Journal: :journal of lasers in medical sciences 0
reza amid 1deptartment of periodontics, school of dentistry, shahid beheshti university of medical sciences, tehran, iran 2dental research center, research institute of dental sciences, school of dentistry, shahid beheshti university of medical sciences, tehran, iran gholamali gholami deptartment of periodontics, school of dentistry, shahid beheshti university of medical sciences, tehran, iran masoud mojahedi deptartmen of laser, school of dentistry, shahid beheshti university of medical sciences, tehran, iran maryam aghalou deptartment of periodontics, school of dentistry, shahid beheshti university of medical sciences, tehran, iran mohsen gholami private practice, tehran, iran mahdieh mirakhori dental research center, research institute of dental sciences, school of dentistry, shahid beheshti university of medical sciences, tehran, iran

introduction: the efficacy of erbium-doped yttrium aluminum garnet (er:yag) laser for root debridement in comparison with curettes has been the subject of many recent investigations. considering the possibility of chemical and ultra-structural changes in root surfaces following laser irradiation, this study sought to assess the effects of scaling and root planing (srp) with curettes and er:yag ...

Journal: :journal of sciences islamic republic of iran 0

nanocrystals of zno were prepared by microwave irradiation using zn (ii) acetate and triethanol amin (tea) as the starting materials and water as solvent. the nanocrystals of zno with hexagonal (wurtzite) structure were characterized by x-ray powder diffraction (xrd), transmission electron microscopy (tem), scanning electron microscopy (sem), uv-vis absorption and ftir spectroscopy techniques.

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