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A Flash Photolysis Facility for Fundamental HO_2 Studies

机译：用于基础HO_2研究的闪光照片

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The objective of this investigation is to develop a new laser spectroscopy technique (namely, Cavity Enhanced Magneto-Optic Rotation (CEMOR)) that is sensitive and selective enough to allow the small peroxy radicals to be measured in combustion systems. CEMOR combines the sensitivity of Cavity Ringdown Spectroscopy (CRDS) with the selectivity of Magneto-Optic Rotation (MOR) to allow sensitive and selective measurements of paramagnetic species in spectral regions congested with stable non-paramagnetic species. An essential step in the development phase of CEMOR for measuring small peroxy radicals (i.e., HO_2 and RO_2) is to generate the species of interest in a controlled environment. To accomplish this task, a low-pressure flash photolysis facility has been designed and developed to carry out CRDS, continuous wave Cavity Ringdown Spectroscopy (cw-CRDS), and CEMOR experiments to measure HO_2. This facility provides a method for studying HO_2 on a fundamental level using cw-CRDS and to test the feasibility of HO_2 measurements using CEMOR. The primary focus of the study is on the low-lying electronic band (A~2A'←X~2A") centered near 7000 cm~(-1) (1428.6 nm) where HO_2 has already been detected using CRDS in this photolysis system. The laser linewidth of the present system is too broad to resolve the spectral features of HO_2 using the CEMOR diagnostic and a path toward this application is suggested based on a narrow linewidth continuous wave laser.
机译：该研究的目的是开发一种新的激光光谱技术（即，腔体增强的磁光旋转（CEMOR）），其敏感和选择性足以允许在燃烧系统中测量小的过氧自由基。 CEMOR将腔旋转光谱（CRD）与磁光旋转（MOR）的选择性结合起来，以允许用稳定的非顺磁性物种拥挤的光谱区域中顺磁性物种的敏感和选择性测量。用于测量小过氧基团的CEMOR发育阶段的基本步骤（即，HO_2和RO_2）是在受控环境中产生感兴趣的物种。为了完成这项任务，设计并开发了低压闪光光解设备，以执行CRD，连续波腔振荡光谱（CW-CRD）和CEMOR实验来测量HO_2。该设施提供了一种使用CW-CRD在基本级别研究HO_2的方法，并使用CEMOR测试HO_2测量的可行性。该研究的主要焦点位于近7000cm〜（-1）（1428.6nm）的低洼电子频带（a〜2a'←x〜2a“），其中使用该光解系统中的CRD已经检测到HO_2 。本系统的激光线宽太广泛，无法使用CEMOR诊断解决HO_2的频谱特征，并且基于窄线宽连续波激光来提出朝向该应用的路径。

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