بنام, محمدرضا
دانشکده فیزیک، دانشگاه پیام نور، تهران
[ 1 ] - بررسی تحلیلی پدیده تونل زنی اسپین با در نظر گرفتن برانگیختگیهای چهار قطبی در آهنربای تک مولکولی fe8
Spin tunneling effect in Single Molecule Magnet Fe8 is studied by instanton calculation technique using SU(3) generalized spin coherent state in real parameter as a trial function. For this SMM, tunnel splitting arises due to the presence of a Berry like phase in action, which causes interference between tunneling trajectories (instantons). For this SMM, it is established that the use of quadru...
[ 2 ] - Optical klystron FEL scheme for x-ray coherent harmonic generation at ISLF storage ring
The possibility of inserting an optical klystron on the storage ring of an Iranian Light Source Facility as a Synchrotron Radiation Free electron Laser for coherence harmonic generation in the soft x-ray spectrum has been studied. The study has been performed using the 3D FEL simulation code GENESIS 1.3 and in accordance with the available characteristic parameters of ISLF. Different potential ...
[ 3 ] - The Electronic and Optical Properties of Pristine, Fluorinated and Chlorinated Pentacene Molecules: An ab-initio Study
In This research the effect of fluorine and chlorine substituents on the electronic and opticalproperties of pentacene molecule have been investigated based on density functional theory as implemented in SIESTA code. The results show thatthe full replacement of hydrogen atoms with fluorine and chlorine in pentacene molecule, leads to ...
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