新型静电离子导入器的研制

A novel electrostatic ion guide(EIG) was designed and manufactured according to the simion simulation. Favorable focusing effect with high transmission efficiency was achieved by optimizing different parameters. EIG was used to ensure the vacuum difference between electrospray ionization(ESI) and time of flight mass spectrometry(TOF MS), and achieve ion-neutral molecular separation as well.     

阿司匹林的真空紫外光电离光解离质谱研究

Aspirin was investigated with infrared laser desorption/vacuum ultraviolet photoionization and photodissociation mass spectrometry(IR LD/VUV PIMS) technique. Due to the tunability of VUV photon energy, the mass spectra of aspirin at different photon energies were measured. Combining theoretical calculation, the proposed dissociation pathways of precursor cations were well depicted.     

铈对盐胁迫下小麦幼苗中叶绿素含量的影响

本文以小麦种子为材料,分别用四组溶液对小麦种子进行处理,研究了一定浓度的Ce(NH4)2(NO3)6对盐胁迫下小麦幼苗中叶绿素含量的影响。结果表明:当用浓度为0.8%NaCl溶液对小麦种子进行盐胁迫时,溶液中含10mg/L的Ce(NH4)2(NO3)6能够提高幼苗叶绿素的含量。这表明铈对于小麦种子的萌发生长具有一定的调节作用,在一定程度上能降低盐胁迫对小麦种子的危害。     

特比萘芬的红外激光解吸/真空紫外光电离质谱研究

Vacuum ultraviolet (VUV) photoionization mass spectrometry of antifungal drug terbinafine was investigated with IR laser desorption/VUV photoionization mass spectrometry (IR LD/VUV PIMS). By varying the VUV photon energy for ionization, the mass spectra of terbinafine at various photon energies were measured, and the formation pathways of dominant fragment ions were discussed.     

红外激光解吸/真空紫外光电离质谱技术及初步应用

We introduce a method combining IR laser desorption with tunable synchrotron vacuum ultraviolet photoionization mass spectrometry. The method needs no matrix and sample preparation. Fragment-free mass spectrometric analysis can be accomplished by near-threshold photoionization, while fragments can be formed by increasing photon energy. Mixtures (even isomers) can be distinguished by measurements of photoionization efficiency spectra.