SIMS molecular cluster intensities of inorganic salts containing sulfur and nitrogen oxyanions

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

“…In SIMS, the cluster ion intensity distribution can be representative for the sulfur speciation, as was demonstrated by Ganjei et al (11). Using Plog's empirical model (12), they fitted the distribution of the relative intensities of the SO,f (re = 1 to 4) cluster ions, as a function of the fragment valence K = q + 2re (with q being the charge of the ion and re being the number of oxygen atoms in the cluster ion) according to the formula with G~b eing the K value at the maximum intensity of the distribution and ( -)2 being the variance of the intensities.…”

Ion intensity and image resolution in secondary ion mass spectrometry

“…Components that have spectral peaks at the same m/e values, when present in a multicomponent sample, will give extreme spectral overlap. An example of such overlap has been reported for the negative secondary ion mass spectra measured for the inorganic salts Li2S04, Na2S03, Na2S04, and Na2S203 (5). The same m/e value peaks appear in the negative ion spectra of each salt.…”

On the identification of the sulfur oxidation state in inorganic sodium sulfoxy salts by laser microprobe mass analysis and secondary ion mass spectrometry

“…On the Identification of the Sulfur Oxidation State in Inorganic Sodium Sulfoxy Salts by Laser Microprobe Mass Analysis and Secondary Ion Mass Spectrometry Sir: In a recent paper (1), Bruynseels and Van Grieken investigated the potential of laser microprobe mass spectrometry (LAMMA) to infer the sulfur-to-oxygen stoichiometry in various sodium sulfoxy salts. Previously we carefully studied (2-5) such inorganic compounds in static and dynamic secondary ion mass spectrometry (SIMS); Ganjei et al also reported negative spectra in the dynamic mode (6). It is thus interesting to compare SIMS and LAMMA regarding the metalloid's oxidation state identification and to examine the various ion formation mechanisms which likeky occur in both techniques.…”

“…Regarding sodium sulfoxy salts, the weakest interaction is likely between sodium and oxygen (the relative strengths of the interactions between lattice atoms are estimated according to bond dissociation energies found in ref 7), this can lead to a relatively high yield of intact anions (SO""). Contrary to LAMMA (1), SIMS (6) enables the identification of the sulfur oxidation state if the Plog model ( 8) is used to fit the SO"d istribution. The fact that it does not work in LAMMA is perhaps related to a higher degree of atomization owing to dependent on the metal-oxygen (M-O) bond and thus on the nature of the cation.…”