在飞行时间质谱仪上安装了一个新设计的固体样品快速进样装置,并改进了离子源结构,使用波长为248 nm的KrF准分子激光器,以2,5二羟基苯甲酸为基质,对几种罗丹明染料进行了基质辅助激光解吸电离研究,得到了各种样品的质谱图并进行了分析.同时研究了入射激光强度和不同浓度样品对质谱信号的重复性和分辨率的影响.结果表明,只要样品和基质能够同时溶于同一种溶剂,只需一台单一波长激光器就能对众多的物质成分进行分析和检测.

A new solid sample inlet interface was mounted on a homemade time-of-flight mass spectrometer, and the ion source structure was rebuild. Several Rhodamine dyes was analyzed by matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. A KrF excimer laser output at 248nm is used to induce the desorption ionization process. The matrix material 2,5-dihydroxybenzoic is used in all experiments. Characteristic fragmentation mass spectra of these species are detected. The influence of laser power and the optimal matrix/analyte molar ratio on repeatability and resolution of the mass spectra was also studied. It was found that one can use a single wavelength laser to carry out the detection of numerous species if the analyte and the matrix can be dissolved in the same solvent.