注意：一种模块化且稳健的连续超声速膨胀放电源。

Note: A modular and robust continuous supersonic expansion discharge source.

作者信息

Crabtree Kyle N, Kauffman Carrie A, McCall Benjamin J

机构信息

Department of Chemistry, University of Illinois, Urbana, Illinois 61801, USA.

出版信息

Rev Sci Instrum. 2010 Aug;81(8):086103. doi: 10.1063/1.3478019.

DOI:10.1063/1.3478019

PMID:20815632

Abstract

A direct current discharge has been coupled with a continuous supersonic expansion to provide a source of rotationally cold molecular ions for gas phase spectroscopy. Constructed primarily of machinable ceramic and stainless steel, this source design is modular, customizable, and robust. Its performance has been assessed by recording transitions within the nu(2) fundamental band of H(3) (+) using cavity ringdown spectroscopy to determine the rotational temperature of ions produced in the free-jet expansion. Temperature and column density were recorded as a function of discharge current as the source was operated over a period of 200 h. Observed temperatures ranged between 50-110 K, and the ion column densities between 8x10(10) and 2x10(12) cm(-2).

摘要

直流放电已与连续超声速膨胀相结合，以提供用于气相光谱学的旋转冷分子离子源。该源设计主要由可加工陶瓷和不锈钢制成，具有模块化、可定制且坚固耐用的特点。通过使用腔衰荡光谱记录H(3) (+) 的ν(2) 基频带内的跃迁来评估其性能，以确定自由射流膨胀中产生的离子的旋转温度。在该源运行200小时的过程中，记录了温度和柱密度随放电电流的变化。观察到的温度范围在50 - 110 K之间，离子柱密度在8×10(10) 至2×10(12) cm(-2) 之间。