Progress of Soft-x-ray Absorption Endstation for Environmental Samples

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• 作者：Amphol  ; Wongjamras^a ;   ; ^b ;   ; ^{scphi009@chiangmai.ac.th} ; Alfred S.  ; Schlachter^c ; Wayne C.  ; Stolte^c ;   ; ^d
• 关键词：soft-x-ray ; x-ray absorption ; liquid sample ; environmental sample ; ambient pressure
• 刊名：Energy Procedia
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：9
• 期：Complete
• 页码：56-62
• 全文大小：756 K

文摘

A new endstation was developed at beamline 9.3.1 of the Advanced Light Source (ALS), Berkeley, CA, USA, to perform x-ray absorption experiments with soft x-rays on environmental samples such as liquid and hydroscopic solid samples at atmospheric pressure. The sample stage is separated from the vacuum of the beamline by a thin beryllium (Be) window which is 0.05 mm thick and 0.64 cm in diameter. A Si-photodiode is used to measure fluorescence from the sample. The experiments are conducted in an enclosure (mini-hutch) to protect users from x-ray radiation, to prevent ambient light from hitting the detector, and to allow running experiments with a background of another gas rather than air. Here we report on fluorescent-mode x-ray-absorption measurement at the chlorine K-edge of KCl and CCl3F in liquid and solid phases, illustrating the capabilities of the instrument and the technique.