کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5395741 | 1505726 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electron trajectory simulations of time-of-flight spectrometers for core level high-energy photoelectron spectroscopy at pulsed X-ray sources
ترجمه فارسی عنوان
شبیه سازی مسیر الکترومغناطیسی از طیف سنج زمان پرواز برای طیف سنجی فوتوالکتر بالای انرژی هسته در منابع اشعه ایکس پالسی
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کلمات کلیدی
شبیه سازی الکترو اپتیک، تجزیه و تحلیل زمان پرواز، طیف سنجی فوتومسیم اشعه ایکس سخت،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
چکیده انگلیسی
The advent of Free Electron Lasers (FELs), able to provide short (2-100 fs) and intense (1033 photons/s/mm2/mrad2/0.1%bandwidth) pulses of light also in the hard X-ray regime (âÏ> 2000 eV), opens new possibilities to study the ultrafast dynamics of processes, exploiting the capability of Hard X-ray Photoelectron Spectroscopy (HAXPES) to measure core-level spectra of elements with bulk sensitivity. In order to detect the intense bursts of high kinetic energy electrons generated by the X-ray pulses with an energy resolution comparable to the existing category of electron analyzers, a new class of spectrometers must be designed. We present a characterization of two different TOF spectrometers, namely one based on a retarding cylindrical lens and another one based on the spherical reflector geometry. SIMION® software has been used in order to evaluate electron trajectories of high kinetic energy electrons (5000-10,000 eV) and extract transmission properties, angular acceptance and energy resolution. It resulted that while the linear system is able to accept a larger solid angle (â¼50 msr), the spherical mirror offers a better resolving power (around 71,000). Both analyzers are capable of a transmission above 90% within range of kinetic energies wide enough to measure the full line-shape of a core photoionization peak. Furthermore, we proved that both instruments are able to discriminate between two consecutive electron bunches having a temporal separation inferior than 220 ns, which is the distance between two consecutive photon pulses at the European X-ray Free Electron Laser (EXFEL), which is currently under construction in Hamburg.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 205, November 2015, Pages 98-105
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 205, November 2015, Pages 98-105
نویسندگان
V. Lollobrigida, G. Greco, D. Simeone, F. Offi, A. Verna, G. Stefani,