Abstract
The high-resolution emission spectra measured using a microscope Raman spectrometer and direct-inlet electron ionization mass spectrometry (DI-EIMS) were studied for the rapid analysis of a trace amount of various europium β-diketonates in order to utilize them as fluorescent markers. Five kinds of europium β-diketonates were distinguished from the emission spectra obtained using the Raman spectrometer. For DI-EIMS, the electron ionization mass spectra of the europium β-diketonates showed the characteristic fragment ion peaks due to the isotope effect of 151Eu and 153Eu. The DI-EIMS was very useful for identifying the compounds compared with spectrofluorometry. The scan and selected ion-monitoring modes of DI-EIMS showed the detection limits of the samples at levels of hundreds and tens of nanograms (ng), respectively.
