Development of Atomospheric Pressure Multiphoton Ionization Method for Liquid Chromatography and Mass Spectrometry Systems

采用微皮秒激光(532 nm，50 mJ，500 ps，1 kHz)进行大气压多光子电离(APMPI)。与使用真空紫外灯的常压光电离和使用电晕放电的常压化学电离方法相比，APMPI没有显示任何来自洗脱液和污染物的背景信号。用APMPI分析大气污染物中的多环烃时，得到了较好的S/N值。

Atmospheric pressure multiphoton ionization (APMPI) method using a tiny picosecond laser (532 nm, 50 microJ, 500 ps, 1 kHz) was applied for the liquid chromatography and mass spectrometry systems. In contrast to ordinal atmospheric pressure photoionization using VUV lamp and atmospheric pressure chemical ionization methods using Corona discharges, APMPI did not show any background signals originated in eluent and contaminants. A good S/N values were obtained when polycyclic hydrocarbons, one of the atmospheric pollutants, was analyzed by using APMPI.