In situ cationization of molecular ions sputtered from organic specimens under cluster bombardment

2018 ◽  
Vol 36 (3) ◽  
pp. 03F106 ◽  
Author(s):  
Hubert Gnaser ◽  
Wolfgang Bock ◽  
Jiro Matsuo
Keyword(s):  
Molecular Ions ◽  
Cluster Bombardment

Improvement of biomolecular analysis in thin films using in-situ matrix enhanced Secondary Ion Mass Spectrometry

The Analyst ◽  
2021 ◽  
Author(s):  
Konstantin Moshkunov ◽  
Benjamin Tomasetti ◽  
Thomas Daphnis ◽  
Vincent Delmez ◽  
Kevin Vanvarenberg ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Secondary Ion Mass Spectrometry ◽  
Imaging Mass Spectrometry ◽  
Molecular Ions ◽  
Limiting Factor ◽  
Ion Mass Spectrometry ◽  
Resolution Imaging ◽  
Biomolecular Analysis ◽  
Secondary Ion

Sensitivity to molecular ions remains a limiting factor for high resolution imaging mass spectrometry of organic and biological materials. Here, we investigate a variant of matrix-enhanced secondary ion mass spectrometry...

Cationization and fragmentation of molecular ions sputtered from polyethylene glycol under gas cluster bombardment: An analysis by MS and MS/MS

2018 ◽  
Vol 430 ◽  
pp. 149-157 ◽  
Author(s):  
Prutchayawoot Thopan ◽  
Hubert Gnaser ◽  
Rika Oki ◽  
Takaaki Aoki ◽  
Toshio Seki ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Molecular Ions ◽  
Cluster Bombardment

scholarly journals H 3 + , the ideal probe for in situ measurement of the Galactic cosmic rays

2019 ◽  
Vol 377 (2154) ◽  
pp. 20180402 ◽  
Author(s):  
Takeshi Oka
Keyword(s):  
Cosmic Ray ◽  
Ionization Rate ◽  
Galactic Cosmic Rays ◽  
Molecular Ions ◽  
Galactic Centre ◽  
Galactic Disc ◽  
The Galaxy ◽  
Diffuse Clouds ◽  
The Ideal

The reason why H 3 + is an ideal probe for in situ measurement of cosmic ray energy density in the Galaxy is discussed. The variation of measured values of cosmic ray ionization rate ζ of H 2 since the theoretical prediction by Spitzer & Tomasko (Spitzer & Tomasko 1968 Astrophys. J. 152 , 971–986) is reviewed. How the measurements by H 3 + established ζ as of the order of 10 −17  s −1 for dense clouds, 10 −16  s −1 for diffuse clouds in the Galactic disc, and 10 −14  s −1 for warm and diffuse gas in the Galactic centre is discussed. This article is part of a discussion meeting issue ‘Advances in hydrogen molecular ions: H 3 + , H 5 + and beyond’.

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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