Mass spectrometric study of ion/molecule reaction in methane and ammonia mixtures

Wójcik, Leszek; Markowski, Artur

doi:10.1016/j.vacuum.2005.01.032

Cited by 8 publications

(3 citation statements)

References 29 publications

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Section: Resultsmentioning

confidence: 99%

“…Plasma diagnostics.-It was reported that as CH 4 and NH 3 were ionized by energetic electrons, the primary ions CH 4+ , CH 3+ , CH 2+ , and NH 3+ , NH 2+ , NH + were produced. 22 These ions were reacted with neutral CH 4 and NH 3 to form the secondary ions, and they were further ionized, dissociated, and/or reacted with each other to form other ions. 22 Figure 1 shows the results of OES spectra for different NH 3 /CH 4 ratios.…”

Section: Resultsmentioning

confidence: 99%

“…22 These ions were reacted with neutral CH 4 and NH 3 to form the secondary ions, and they were further ionized, dissociated, and/or reacted with each other to form other ions. 22 Figure 1 shows the results of OES spectra for different NH 3 /CH 4 ratios. This figure shows that as NH 3 is not added in CH 4 (NH 3 /CH 4 = 0), only OES peaks of CH (at 390 and 430 nm), H α (at 656 nm), H β (at 486 nm), and H γ (at 434 nm) 23 are observed.…”

Section: Resultsmentioning

confidence: 99%

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Effects of Ammonia/Methane Mixtures on Characteristics of Plasma Enhanced Chemical Vapor Deposition n-Type Carbon Films

Hsueh

Chiang

et al. 2011

J. Electrochem. Soc.

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This study investigates the effect of ammonia/methane (NH3/CH4) mixtures on characteristics of nitrogen-doped amorphous hydrogenated carbon (a-C:H(N)) films prepared by plasma enhanced chemical vapor deposition. The a-C:H(N) films with identical thickness are deposited on p-type silicon (p-Si) substrates using different NH3/CH4 ratios. These a-C:H(N)/p-Si junctions are a potential candidate to use in electronic or photoelectronic devices. The microstructures, optical properties, and mechanical properties of a-C:H(N) films are evaluated. Furthermore, the residual stresses in a-C:H(N) films, and also, the current density-voltage and capacitance density-voltage behaviors of a-C:H(N)/p-Si devices are investigated. Experimental results indicate that as the NH3/CH4 ratio increases from 0 to 0.2, the nitrogen/carbon ratio increases from 0 to 5.4%. The nitrogen-carbon bonds, nitrogen-hydrogen bonds, and sp(2) carbon fraction of carbon films enlarge with increasing NH3/CH4 ratio, while the deposition rate, ordered degree, optical band gap, reduced Young's modulus, hardness, and residual stress of carbon films decrease. The a:C:H(N)/p-Si device has an optimum electrical property at the NH3/CH4 ratio of 0.15 (or at the N/C ratio of 4.7%). Finally, the results of this study are compared with those reported in literatures. (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.051202jes] All rights reserved

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effects of Ammonia/Methane Mixtures on Characteristics of Plasma Enhanced Chemical Vapor Deposition n-Type Carbon Films

Hsueh

Chiang

et al. 2011

J. Electrochem. Soc.

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Current literature in mass spectrometry

2006

J. Mass Spectrom.

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In order to keep subscribers up‐to‐date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of mass spectrometry. Each bibliography is divided into 11 sections: 1 Books, Reviews & Symposia; 2 Instrumental Techniques & Methods; 3 Gas Phase Ion Chemistry; 4 Biology/Biochemistry: Amino Acids, Peptides & Proteins; Carbohydrates; Lipids; Nucleic Acids; 5 Pharmacology/Toxicology; 6 Natural Products; 7 Analysis of Organic Compounds; 8 Analysis of Inorganics/Organometallics; 9 Surface Analysis; 10 Environmental Analysis; 11 Elemental Analysis. Within each section, articles are listed in alphabetical order with respect to author (4 Weeks journals ‐ Search completed at 15th. Mar. 2006)

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Establishment of mass spectrometric fingerprints of novel synthetic cholesteryl neoglycolipids: The presence of a unique C-glycoside species during electrospray ionization and during collision-induced dissociation tandem mass spectrometry

El‐Aneed

Banoub

Koen‐Alonso

et al. 2007

J. Am. Soc. Mass Spectrom.

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In this study we evaluated the fragmentation pattern of 16 novel amphiphilic neoglycolipid cholesteryl derivatives that can be efficiently used to increase cationic liposomal stability and to enhance gene transfer ability. These neoglycolipids bear different sugar moieties, such as D-glucosamine, In addition, we observed a unique ion that could not be rationally explained by the expected fragmentation of these amphiphilic molecules. The structure of this ion was tentatively proposed with that of a C-glycoside species formed by a chemical reaction between the sugar portion and the cholesterol. MS/MS analysis of this unique [C-glycoside] ϩ confirmed the validity of the proposed structure of this ion. The presence of an amino group at position C-2 and free hydroxyl groups of the sugar motif is crucial for the formation of a "reactive" sugar oxonium ion that can form the [C-glycoside] ϩ species. In summary, we precisely established the fragmentation patterns of the tested series of neoglycolipid cholesteryl derivatives and authenticated their structure as well; moreover, we speculated on the formation of a C-glycoside with the ESI source under atmospheric pressure and in the collision cell during MS/MS analysis. (J Am Soc Mass Spectrom 2007, 18, 294 -310)

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Mass spectrometric study of ion/molecule reaction in methane and ammonia mixtures

Cited by 8 publications

References 29 publications

Effects of Ammonia/Methane Mixtures on Characteristics of Plasma Enhanced Chemical Vapor Deposition n-Type Carbon Films

Effects of Ammonia/Methane Mixtures on Characteristics of Plasma Enhanced Chemical Vapor Deposition n-Type Carbon Films

Current literature in mass spectrometry

Establishment of mass spectrometric fingerprints of novel synthetic cholesteryl neoglycolipids: The presence of a unique C-glycoside species during electrospray ionization and during collision-induced dissociation tandem mass spectrometry

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