Book contents
- Frontmatter
- Contents
- Preface
- Conference participants
- Conference photograph / poster
- 1 Physics of H2 and HD
- 2 Formation - Destruction
- Experiments with Trapped Ions and Nanoparticles
- Laboratory Studies of Molecular Hydrogen Formation on Surfaces of Astrophysical Interest
- The Formation of H2 and Other Simple Molecules on Interstellar Grains
- The Interaction of H Atoms with Interstellar Dust Particles: Models
- The Energetics and Efficiency of H2 Formation on the Surface of Simulated Interstellar Grains
- Probing the Connection between PAHs and Hydrogen (H, H2) in the Laboratory and in the Interstellar Medium
- 3 Observations and Models
- 4 Extragalactic and Cosmology
- 5 Outlook
- Author index
Experiments with Trapped Ions and Nanoparticles
from 2 - Formation - Destruction
Published online by Cambridge University Press: 04 August 2010
- Frontmatter
- Contents
- Preface
- Conference participants
- Conference photograph / poster
- 1 Physics of H2 and HD
- 2 Formation - Destruction
- Experiments with Trapped Ions and Nanoparticles
- Laboratory Studies of Molecular Hydrogen Formation on Surfaces of Astrophysical Interest
- The Formation of H2 and Other Simple Molecules on Interstellar Grains
- The Interaction of H Atoms with Interstellar Dust Particles: Models
- The Energetics and Efficiency of H2 Formation on the Surface of Simulated Interstellar Grains
- Probing the Connection between PAHs and Hydrogen (H, H2) in the Laboratory and in the Interstellar Medium
- 3 Observations and Models
- 4 Extragalactic and Cosmology
- 5 Outlook
- Author index
Summary
This contribution summarizes experimental work which has been performed predominantly in our laboratory using ion guides and specific traps for studying ions, molecules and dust particles under astrophysical conditions. After a short reminder of the basics of the technique and a brief discussion of our newest device, the nanoparticle trap, we shall review experimental results for low temperature gas phase collisions with H2. In the last part we will summarize our present activities related to chemistry involving cold H atoms.
Introduction
Despite the fact that our knowledge on the role of hydrogen in space has significantly increased in recent years due to a combination of extensive new observations and astrophysical model calculations with fundamental theory and detailed innovative experiments, there are still many unsolved problems related to the interaction of H or H2 with ions, radicals, surfaces and also photons. The most obvious example is the formation of H2 itself; other examples include specific state-to-state cross sections, ortho-para transitions in H2, H-D isotopic scrambling, formation and destruction of the molecule, or the role of hydrogen clusters and anions. In addition to gas phase reactions we will discuss in this paper our most ambitious goal, the detection of catalytic formation of H2 molecules on an interstellar dust analogue localized in a cold trap.
Experimental: Ion guides and particle traps
Inhomogeneous RF or AC fields
From the point of view of experimental techniques, our research is predominantly based on the use of specific inhomogeneous, time-dependent, electrical fields, E0(r,t) = E0(r) · cos(Ωt).
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- Molecular Hydrogen in Space , pp. 63 - 70Publisher: Cambridge University PressPrint publication year: 2000
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