是指一个 formula unit 的 particle 的 relative mass。本来是该用于没有 molecule 的 particle 的 relative mass。例如 NaCl 含 ions 而不含 molecules，所以没有 r.m.m.，但 NaCl 含一个 Na+ ion 和一个 Cl- ion，所以 f.m. of NaCl = 23 + 35.5 = 58.5。但 f.m. 可应用于任何...
In all cases the spectra are simple and characteristic of the compound in question. In general, the [(RO)2PS2]? anion was the base peak, and a chloride attachment ion was invariably present; this ion allows molecularly specific confirmation of the compound. Molecules having stable potential ...
Output fluxes from the catchments were calculated from the quality and quantity of the runoff water. Deposition, weathering, ion exchange, retention and biological accumulation processes were taken into account to calculate catchment H+ budgets, and the ratio between external (anthropogenic) and ...
Mass spectrometry imaging (MSI) is a technology that enables the visualization of the spatial distribution of hundreds to thousands of metabolites in the s
To obtain a mass spectrum, the sample must be vaporized, ionized and, assuming it is molecular, fragmentation of the molecular ion must occur. The various ions thus formed are separated according to their mass-to-charge ratio (m/ze) and then detected. The instruments in which these processes...
SIM refers to the technique of selected ion monitoring. Unlike the techniques just listed, which describe methods of analyzing data, SIM refers to a method of acquiring data. The technique of selected ion monitoring acquires data for preselected m/z values. SIM is a useful and sensitive techniqu...
In Chapter 1, electrospray ionization mass spectrometry (ESI-MS) was used to examine clusters of protonated amine salt solutions with chloride counter ions in the negative ion mode. These ions have the general formula [(RNH3)xClx+1]-. Primary amines generate a wide cluster distribution with cl...
Ion transport and limited currents in supporting electrolytes and ionic liquids Article Open access 13 April 2022 On the limitations in assessing stability of oxygen evolution catalysts using aqueous model electrochemical cells Article Open access 13 April 2021 Unraveling the phase diagram-ion transp...
(a) Scheme of the modified gelation process in the ion-competing crosslinking buffer for alginate. (b) Alginate hydrogel microVRP, alginate labelled with Alexa Fluor 488 dye. (c) Scheme of the silica nanocolloidal precipitation process. (d) Microscopic images of the nanosilica microVRP (false-...
The difficult task of qualitatively identifying the individual gaseous species within a vacuum system is accomplished with mass spectrometers and residual gas analyzers (RGAs), also known as partial pressure analyzers. These instruments function by measuring the ion mass (M) to charge valence (z) ra...