Interaction of Short X-ray Pulses with Small Molecules

بررسی نرخ رشد یک لیزر الکترون آزاد با نوسان‌ساز لیزری و پس زمینه پلاسما

In this paper, a free-electron laser (FEL) growth rate with a laser wiggler in which plasma background is used to generate short wavelengths in x-ray regimes, has been investigated theoretically. A linearly polarized laser pulse, due to having short wiggler periods (inrange) is able to produce coherent radiations in x-ray regions and can be applied as a planar wiggler in a FEL. Phase velocity o...

INTERACTION OF PROTEINS WITH SMALL MOLECULES

Proton ejection from molecular hydride clusters exposed to strong x-ray pulses.

Clusters consisting of small molecules containing hydrogen do eject fast protons when illuminated by short x-ray pulses. A suitable overall charging of the cluster controlled by the x-ray intensity induces electron migration from the surface to the bulk leading to efficient segregation of the protons and to a globally hindered explosion of the heavy atoms even outside the screened volume. We in...

Feasibility of a Laboratory X-Ray Laser Pumped by Ultrashort UV Laser Pulses

In order to allow widespread application of soft X-ray lasers there is a strong effort worldwide to use as small as possible pump lasers for plasma production. Short pulse lasers (-c~ 1 ps), particularly in the UV, have attracted much interest, since extremely high intensities (up to 10 ~8 W/cm 2) can be achieved with a relatively high repetition rate. In this article we discuss their merit for...

Assessment of X-Ray Crosstalk in a Computed Tomography Scanner with Small Detector Elements Using Monte Carlo Method

Introduction: Crosstalk is a leakage of X-ray or light produced in a matrix of X-ray detectors or array of photodiodes in one element to other elements affecting on image contrast and spatial resolution. In this study, we assessed X-ray crosstalk in a computed tomography (CT) scanner with small detector elements to estimate the effect of various parameters such as X-ray tube voltage, detector e...