近室壓X光光電子能譜術與其科學應用

Ambient Pressure X-ray Photoelectron Spectroscopy (APXPS) and Its Scientific Applications

王嘉興(Chia-Hsin Wang) ； 張孫堂(Sun-Tang Chang) ； 楊耀文(Yaw-Wen Yang)

《真空科技》 30卷4期 (2017/12) Pp. 33-42

摘要

近室壓X光光電子能譜是為近十餘年來最具有突破性發展的表面分析技術之一，研究人員不斷利用改善電子分析儀前端具有壓差比功能的電子透鏡設計，使減少樣品表面所產生的光電子與分析腔體中的氣體分子碰撞，提升了光電子在電子分析儀上的偵測效率。此項技術的突破，讓分析腔體的真空環境不須限制在高真空的環境下才能進行能譜收集。而可以於近室壓的環境下直接探索臨場或反應中氣固、液固、氣液相等非均相間反應時，材料表面與界面元素組成比例和化學鍵結狀態的變化。從此項新穎的表面分析技術，獲得的即時訊息將可以導引新型態的能源材料之設計與開發。因此國家同步輻射中心為了提升國內能源領域的發展能力，決定在台灣光源光束線24A上建立近室壓X光光電子能譜實驗站。本文中我們將報導此實驗站的建立及試車的結果與未來科學上的研究潛力。

關鍵字

近室壓X ； 光光電子能譜 ； 臨場能譜 ； 催化

並列摘要

Ambient pressure X-ray photoelectron spectroscopy (APXPS) is perhaps one of the most important surface analysis techniques developed in the past one and half decades. By means of highly sophisticated constantly improved differentially-pumped electrostatic lens systems, researchers have produced efficient electron energy analyzers that minimize electrons-gaseous molecules scattering to the greatest extent. APXPS is now capable of performing photoelectron spectroscopy measurements in soft X-ray energy range at near ambient pressure of a few tens of mbar on a routine basis. This unique advantage of APXPS enables researcher to investigate the changes in elemental composition, and chemical state of the materials surfaces in in-situ and in-operando manners. The heterogeneous interface examined can be extended from gas-solid to, liquid-solid, and even liquidgas category. The real-time information obtained from APXPS technique has proven to be extremely valuable in guiding rational designs of materials targeting for energy application. As an effort dedicated to upgrade energy research capability in Taiwan, NSRRC decided to build an APXPS end-station in Taiwan Light Source. Described herein is a report on the construction and commissioning of the APXPS end-station at beamline 24A and the scientific opportunities afforded by this advance end-station.

並列關鍵字

Ambient Pressure XPS ； in-situ spectroscopy ； catalysis