Laser ablation Fourier transform mass spectrometric study of zeolites

Impact ionization mass spectra of anorthite cosmic dust analogue particles

“…Si 2 may also form, depending on the plasma conditions. Although in some publications AlO is shown to form anions [ Sullivan et al , 2007; Trimborn et al , 1998; Jeong et al , 1995], AlOH might form a cation at 44 u in impact ionization spectra. The high abundances of the 44 and 56 u species implied by the existence of target‐projectile cluster ions [ Hillier et al , 2007b; Postberg et al , 2008; Kempf et al , 2005] indicate that we are indeed detecting significant contributions from 44 Ca/SiO/AlOH at 44 u and Si 2 /CaO (and possibly AlSiH) at 56 u.…”

“…Si 2 may also form, depending on the plasma conditions. Although in some publications AlO is shown to form anions [Sullivan et al, 2007;Trimborn et al, 1998;Jeong et al, 1995], AlOH might form a cation at 44 u in impact ionization spectra. The high abundances of the 44 and 56 u species implied by the Figure 10.…”

“…Clusters of 40 Ca with the Si 2 and AlSiH ions at 56 u may also contribute to the 96 u feature. Jeong et al [1995] observe KAlO 2 cations in mass spectra of zeolites and we suggest that similar CaAlO 2 and CaSiO 2 ions are responsible for the 99 and 100 u peaks. The 117 u peak may be due to CaSiO 3 H. The 147 peak we have already identified as 107 AgCa, although the corresponding correlation with 109 AgCa is below our selection threshold, possibly due to the lower abundance of the 109 Ag peak and thus a corresponding lower abundance of the associated Ca cluster ion.…”

“…[41] Some results from laser ionization experiments with minerals indicate that Al-oxide and Si-oxide species, and their clusters, will tend to form negatively charged ions [Jeong et al, 1995;Trimborn et al, 1998;Sullivan et al, 2007;Xu et al, 1998Xu et al, , 1997. The absence of high abundances of ions with masses corresponding to these species in the cation mass spectra presented here tends to confirm that this effect also occurs in impact ionization.…”

Atomic-scale assessment of the crystallization onset in silicon carbonitride

“…43 While (inter)metallic and non-metallic clusters were intensively studied within the last decades, less is known about clusters from binary and multinary inorganic compounds which exhibit covalent bondings. Thus, only few studies on silica [44][45][46][47][48] or silicon carbide 49,50 are known; whereas there is no systematic study related to the formation and stability of silicon nitride clusters. The results presented here can be consequently used to address in future studies the question which parameters determine the formation of stable (magic-number) silicon nitride clusters.…”