[PDF] Top 20 Performance of a corona ion source for measurement of sulfuric acid by chemical ionization mass spectrometry

... the corona and the americium ion source is nearly perfect is not necessarily expected given the fact that the ions from the corona needle are generated only by a point source whereas ... See full document

... the ion flow tube was also reduced compared to the conditions used previously for carboxylic acids (Veres et ...dride source used in this work consisted of a small volume (30 cm 3 ) bubbler through which a ... See full document

... on ionization efficiency, come with enhanced wall interactions which can contribute potentially large and often poorly un- derstood artifacts to the ...main source of instrument memory and reactive trace ... See full document

... precursors sulfuric acid (SA) and in- dividual highly oxidized multifunctional compounds (HOM, highly oxygenated organic molecules), which are present at around 10 5 to 10 7 cm −3 (Eisele and Tanner, 1993; ... See full document

... though the GA gas-phase Henry’s Law and melt vapor pres- sure systems used here were not ideal, as outlined above. The HAc : GA relative sensitivity was between 1 : 1 and 1 : 10. We are most confident in our Case 1 and ... See full document

... PCIMS instrument was specifically designed to be mounted and utilized from an aircraft and was flown on the NCAR HIAPER (UCAR/NCAR-EOL, 2005) aircraft in the Deep Convective Clouds and Chemistry experiment (DC3; Barth et ... See full document

... − ion (Lee et ...the ion molecule reac- tion time (a few milliseconds) is set by the electric field, and is up to a factor of 30 or more less than those (30–120 ms) in low-pressure CIMS instruments (Bertram ... See full document

... product ion formation × transmission (1) A neutral molecule that forms a strongly bound cluster with iodide at the collision limit should be detected with rela- tively high sensitivity given that it will survive ... See full document

... Figure 1 Principle of tissue on chip based mass spectrometry (toc-MS): (A) Head and neck cancer (HNC) tissue sections were stained H&E to obtain an overview of the tissue architecture. (B) Exemplary ... See full document

... Narayana B et al described a simple and sensitive spectrophotometric method for the determination of ranitidine hydrochloride in pharmaceuticals. This method was based on the formation of coloured condensed product with ... See full document

... that ion emission from charged nanodroplets is associated with a major activation barrier (Figure ...the ion ejection observed here is more appropriately interpreted as IEM-like field emission, rather than ... See full document

... Chapter 4 describes the development of a new method for the in situ detection and quantifica- tion of hydroxyacetone and glycolaldehyde, critical oxidation products of biogenic precursors. Two approaches for ... See full document

... Because our experimental platform has been described in several publications from our laboratories, here we focus on its essential features. It should be emphasized that electrospray ionization mass ... See full document

... As mass spectrometers are still expensive, only a few large medical institutions can afford them; therefore, those without mass spectrometer can extract ribosomal proteins from clinical isolates and send to ... See full document

... + ion which suggests a possible change in structure to something similar to that of 12-crown-4 ether, with the hydroxyl tucked inside the crown-like ring or perhaps a third body stabilization due to changing ... See full document

... desorption ionization mass ...desorption ionization mass spectrum, it was understood that FOAZ could be an electron donor and a proton ...positive ion regions by using stearic ... See full document

... negative chemical ionization source (NCI), which had been fitted to the unoccupied end of a linear ion trap ...other ion/ion reactions on hybrid mass spectrometers, ... See full document

... global source of formic and acetic acids are ∼ 1200 and ∼ 1400 Gmol/yr, dominated by photochemical oxidation of biogenic volatile organic compounds, in particular iso- ...GEOS-Chem chemical transport model ... See full document

... Maternal exposure to Hg(II) during pregnancy has been identified as a potential causal factor in the development of severe neurobehavioral disorders. Children with autism have been identified with lower reduced ... See full document

... promoting ion adduct ...a mass difference of 2 amu and abundance ratio of 3 : 1 due to the natural pres- ence of isotopes 35 Cl and 37 ...molecular ion ([M − H] − ... See full document