汽车排放污染物的共振增强多光子电离光谱分析

汽车排放的主要污染物为CO，HC，NOx(x=1，2），SO2，Pb，苯丙芘，固体颗粒等1]，其尾气的检测对维护人类自身健康具有十分重要的意义．共振增强多光子电离光谱（Resonant Enhanced Multi-Photonionization，REMPI）是一种超灵敏光谱检测技术，它的灵敏度比LIF（Laser InducedFluorescence）还要高．1979年，Brophy和Rentttner2]提出了REMPI可以作为检测大气污染的方法．后来，不同的研究小组采用了不同的REMPI方案对大气污染类分子进行了测量研究［3-6]．由于采用可调谐染料激光器为光源，可以使用同一种染料对几种具有相近特征波长的分子进行同时测定．本文报

REMPI Analysis of Air Pollutants Caused by Car Exhaust

Abstract A laser-based ultra-sensitive detection technique used for determining urban air pollutants caused by car exhaust has been described. A small ion chamber working under the condition of atmospheric pressure was used as the detector and a laser system with UV output was used as the light source. A 1 + 1 and a 2 + 1 REMPI scheme were used for the ultra-sensitive analysis of NOx(x=1 ,2) and CO in car exhaust.