Laser microprobe mass spectrometric identification of sulfur species in single micrometer-size particles

Abstract

power. Thus, structural information about the compound can be studied in detail. At threshold energy, the LMS spectrum generally contains fewer fragment ions than the SIMS spectrum.In those diquaternary salts where charge repulsion between the two positive charges is large, dissociation to form two separate monocations is favorable in both SIMS (7) and LMS. The preference of charge separation in these compounds is responsible for the absence of M2+ in SIMS as well as for (M -H ) ' and (M -CHJ+ in LMS. Finally, a process analogous to halide substitution in the cation in LMS has been reported in SIMS of diquaternary salts (6). ACKNOWLEDGMENTThe authors thank T. M. Ryan of Purdue University for Registry No. . LITERATURE CITED Balasanmugam, K.; Dang, T. A.; Day, R. J.; Hercules, D. M. Anal. Chem. 1981, 5 3 , 2296-2298. Hercules, D. M.; Day, R. J.; Balasanmugam, K.; Dang, T. A,; Ll, C. P. Anal. Chem. W82, 54, 280A-305A. (3) Heinen, H. J.; Meier, S.; Vogt, H.; Wechsung, R. Adv. Mass Spectrom. (4) Katakuse, I.; Matsuo, T.; Wollnik, H.; Matsuda, H. Org. Mass Spec-

Microscopical speciation analysis with laser microprobe mass spectrometry and static secondary ion mass spectrometry

“…Several publications describe the application of TOF-LMMS for pure inorganic substances such as binary salts [8,9], oxides [10][11][12] and oxysalts [8,[12][13][14][15]. Particularly for oxides, TOF-LMMS detects more extending series of cluster ions than FT-LMMS.…”

“…As a result, the TOF-LMMS data are often used as fingerprints and a comparative approach using reference spectra is necessary to identify the analyte [16,17]. There is also a stronger influence of the applied laser power density in TOF-LMMS as opposed to FT-LMMS [12,13]. Up until now the observed differences between TOF and FT-LMMS spectra can be related consistently to the detection of the prompt ions only in TOF-LMMS and the integration recording of the prompt and delayed ions in FT-LMMS, but further research will be necessary to fully elucidate this aspect.…”

Laser microprobe mass spectrometry: Possibilities and limitations

“…Nevertheless, the disagreement between the data obtained for Na2S20 5 under threshold conditions and those reported for Na 2 SO4 and Na z SO 3 [50] illustrates again the importance of careful evaluation of the practical methods of procedure in LMMS. Nevertheless, the disagreement between the data obtained for Na2S20 5 under threshold conditions and those reported for Na 2 SO4 and Na z SO 3 [50] illustrates again the importance of careful evaluation of the practical methods of procedure in LMMS.…”

Recent Advances in Real-time Mass Spectrometry Detection of Bacteria

“…Initially, the capability for analysis of deposited aerosol particles was oddly reported among biomedical applications (Kaufman, Hillenkamp, and Wechsung 1979), but LAMMA was then quickly adopted by aerosol investigators (Wieser, Wurster, and Seiler 1988). The initial studies concerned technology development, for example for measuring the elemental composition of micron size particles (e.g., Bruynseels and Van Grieken 1984). This technology was then applied in atmospheric aerosol research (e.g., Bruynseels et al 1988;Dierck et al 1992;Hara et al 1996).…”