Study on ion formation in electrospray droplet impact secondary ion mass spectrometry

Asakawa, Daiki; Fujimaki, Susumu; Hashimoto, Yutaka; Mori, K.; Hiraoka, Kenzo

doi:10.1002/rcm.3004

Cited by 42 publications

(46 citation statements)

References 26 publications

(48 reference statements)

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“…One of the characteristic features of EDI is its capability to form abundant positive and negative ions for many organic compounds, e.g., amino acids, 44) peptides, 45) proteins, 45) biological tissues, 46) pigments, 47) C 60 , 44) and inorganic compounds (e.g., silicon, silicon oxide, gold, indium, alkali halides, etc.). [48][49][50] For example, Fig.…”

Section: Electrospray Droplet Impactmentioning

confidence: 99%

“…In EDI mass spectra, some compounds give strong radical cations and anions, (e.g., for C 60 , 44) coronene, and organic pigments 47) ) in addition to [M+H] + and [M−H] − ions. For example, mass spectra for C 60 , C + 60 and C − 60 ions are detected in EDI with approximately equal abundances.…”

Section: 4748)mentioning

confidence: 99%

“…For example, mass spectra for C 60 , C + 60 and C − 60 ions are detected in EDI with approximately equal abundances. 44) Some of these ions may be formed by the disproportionation electron transfer Reaction (7) caused by the supersonic collision in EDI. 47)…”

Section: 4748)mentioning

confidence: 99%

“…e etching rates with EDI were determined experimentally for several materials, for example, ∼2 nm/min for bradykinin, 44,53) 3-5 nm/min for polystyrene, 54,55) 2 nm/min for polyethylene terephthalate, 54,55) Roughly, the etching rates for organic materials (synthetic polymers and peptides) are about one order of magnitude higher than those for inorganic materials (metal, metal oxides, and SiO 2 ). e characteristic features of EDI may be summarized as follows.…”

Section: 4748)mentioning

confidence: 99%

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Desorption in Mass Spectrometry

et al. 2017

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In mass spectrometry, analytes must be released in the gas phase. ere are two representative methods for the gasi cation of the condensed samples, i.e., ablation and desorption. While ablation is based on the explosion induced by the energy accumulated in the condensed matrix, desorption is a single molecular process taking place on the surface. In this paper, desorption methods for mass spectrometry developed in our laboratory: ash heating/rapid cooling, Leidenfrost phenomenon-assisted thermal desorption (LPTD), solid/solid friction, liquid/solid friction, electrospray droplet impact (EDI) ionization/desorption, and probe electrospray ionization (PESI), will be described. All the methods are concerned with the surface and interface phenomena. e concept of how to desorb less-volatility compounds from the surface will be discussed.Copyright © 2017 Dilshadbek Tursunbayevich Usmanov, Satoshi Ninomiya, Lee Chuin Chen, Subhrakanti Saha, Mridul Kanti Mandal, Yuji Sakai, Rio Takaishi, Ahsan Habib, Kenzo Hiraoka, Kentaro Yoshimura, Sen Takeda, Hiroshi Wada, and Hiroshi Nonami. is is an open access article distributed under the terms of Creative Commons Attribution License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.Please cite this article as: Mass Spectrom (Tokyo) 2017; 6(2): S0059 Keywords: desorption, ablation, thermal desorption, Leidenfrost phenomenon, ash heating, electrospray droplet impact ionization, probe electrospray ionization (Received September 20, 2016; Accepted January 4, 2017) RATIONALE: ABLATION VS. DESORPTION e two technical terms, ablation and desorption, should be distinguished rigorously. As shown in Fig. 1, ablation is induced by explosion of the matrix or substrate whereas desorption is a single molecular event, i.e., detachment of a single molecule from the surface. e antonym of desorption is adsorption.In matrix assisted laser desorption/ionization (MALDI), for example, the photon energy is ultimately converted to thermal energy and ablation of the matrix takes place above the critical laser power (Fig. 1(a)). In ablation, the ablated materials are mainly composed of aggregates. us the ions observed in MALDI are only a small part of materials ablated. In this respect, MALDI is more likely matrixassisted laser "ablation" ionization. In secondary ion mass spectrometry (SIMS), primary projectiles such as Ar, and (Ar) n + are used. In SIMS using atomic ion projectiles, the sputtering is caused by the cascade collisions in the sample. us the useful yield de ned as [total gas phase ions detected] divided by [total amount of sample sputtered] is rather low. e small useful yields for MALDI and SIMS (10 −5 -10) originate from the fact that photons or primary beams penetrate into the target materials leading to the sputtering of the substrate. In contrast, the useful yield for desorption-based techniques could be much higher than MALDI and SIMS if the desorbed molecules are ionized by high-e cien...

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Section: Electrospray Droplet Impactmentioning

confidence: 99%

Section: 4748)mentioning

confidence: 99%

Section: 4748)mentioning

confidence: 99%

Section: 4748)mentioning

confidence: 99%

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Desorption in Mass Spectrometry

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“…In another range of sizes, the interaction of huge molecular clusters with surfaces was also extensively studied experimentally. In particular, glycerol and H 2 O nano and microdroplets have been used in massive cluster impact (MCI), 77 electrospray droplet impact (EDI), 78,79 impact desolvation of electrosprayed microdroplets (IDEM), 80 and desorption electrospray ionization (DESI). 81,82 Building on the results obtained with C 60 , a series of theoretical studies have been devoted to the comparison of larger light-element clusters, essentially fullerenes, impinging on a bulk organic sample, benzene.…”

Section: Light-element Clustersmentioning

confidence: 99%