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Showing 1 to 20 of 47 for “"Molecular ion"”.
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Novel techniques for molecular ion spectroscopy in a discharge
Velocity modulation laser spectroscopy has proven to be a successful spectroscopic technique for the study of molecular ions; indeed, it has become the conventional technique. However, there are a number of limitations to velocity modulation in its conventional form. First, there is a background …
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Photoionization and Photofragmentation of the Endohedral Xe@C60+ Molecular Ion
An experimental study of photoionization and fragmentation of the Xe@C60 + endohedral molecular ion is presented in the photon energy range of the well-known Xe 4d giant resonance, and evidence of redistribution of the Xe 4d oscillator strength in photon energy due to multipath interference is …
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Electron collisions and internal excitation in stored molecular ion beams
… the role, which the initial internal excitation of a molecular ion can play in electron collisions, and the effect of these collisions on the internal excitation are investigated. Dissociative recombination (DR) and inelastic and super-elastic collisions are studied in the system of He2+. The …
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An experimental study of molecular ion-surface interactions at organic layers.
An experimental study of molecular ion-surface interactions at organic layers.
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Competition between Reaction Channels in Electron Collisions of the Hydrogen Molecular Ion HD+
The energy-differential cross-section of dissociative recombination of the HD+ molecular ion (HD+ + e -> H + D) was measured with high precision and on an absolute scale, at the heavy-ion storage ring TSR (Max-Planck-Institut für Kernphysik). The measured cross-section shows a previously unknown …
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The NICE-OHVMS technique: realizing the full potential of precision molecular ion spectroscopy
… Enhanced Optical Heterodyne Velocity Modulation Spectroscopy (NICE-OHVMS) is one of the most sensitive spectroscopic techniques specific to molecular ions. NICE-OHVMS relies on the combination of three separate techniques, each of which is a powerful tool. Cavity enhancement extends the …
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Cryogenic surface electrode ion traps with integrated superconducting microwave resonators for polar molecular ion spectroscopy
… also makes them suitable for quantum information manipulation or for tests of fundamental laws of nature. These experiments require precise control over the molecular internal degrees of freedom. There are few present proposals for trapping and cooling molecules. One proposal is based on …
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Pseudo-Molecular Ion Formation by Aromatic Acids in Negative Ionization Mode Electrospray Ionization Mass Spectrometry
Pseudo-molecular ion formation is an artifact common to most analyses performed by electrospray ionization mass spectrometry. These species are non-covalent complexes formed between an analyte of interest and any other components (such as mobile phase, additives, and impurities) present in the …
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High current coaxial ion beam/laser beam spectrometer
The construction and operation of a new apparatus for making spectroscopic investigations of molecular ions is described. In the new ion beam machine, the ion beam and laser beam overlap in a coaxial geometry. The machine has much higher ion current than an apparatus previous used. The laser beam …
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Atomic and molecular ions with photon resonators for quantum information science
With continued development of laser-atom interaction, systems of trapped ions offer a promising platform for the realization of fault-tolerant quantum information processing (QIP). Much progress with single atomic and molecular ion qubits has been made both in theory and experiment on the …
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Progress in sensitive mid-infrared spectroscopy of cooled molecular ions
The spectroscopic investigation of molecular ions is key to facilitating a better understanding of chemical and physical processes that occur both here on Earth and among distant stars. However, numerous challenges are encountered when attempting to study these highly reactive species in the …
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Mass Spectrometric Characterization of Peptides in Neurons
… approach is inherently different from conventional methods, in that essentially all peptides present at significant concentrations are detected, not only those which are pre-selected or radioactively tagged. Furthermore, single cells, nerves, and vesicles are screened without the need to …
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Incoherent Scatter Radar Observations of Dynamic Ion Composition Changes at High Latitudes during Geomagnetic Storms
… new methods are developed for estimating F region ion composition from field-aligned incoherent scatter radar (ISR) measurements. These methods address incoherent scatter spectra temperature-mass ambiguities by self-consistently modeling ion temperature profiles as a function of electric fields …
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Evaluation of aflatoxin-related products from ozonated corn
This study assessed the efficacy of the ozonation process in degrading aflatoxin in corn, and investigated the chemical reaction between aflatoxin and gaseous ozone. Ozonation (12-13 wt%) totally degraded aflatoxin B1 in a model system. Conversion of aflatoxin into polar compounds was observed …
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A 3-D Model of the Auroral Ionosphere
<p>A new 3-D model of the high latitude ionosphere is developed to study the coupling of the ionosphere with the magnetosphere and neutral atmosphere. The model consists of equations describing conservations of mass, momentum and energy for the six ionospheric constituents (O+, NO+, N+2 , O+2 , N+ …
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Investigation of the effects of low energy high dose ion bombardment in metals and compound semiconductors
The effect of low energy nitrogen molecular ion beam bombardment on metals and compound semiconductors has been studied, with the aim to investigate at the effects of ion and target properties. For this purpose, nitrogen ion implantation in aluminium, iron, copper, gold, GaAs and AIGaAs is studied …
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Internal Excitations of Stored Triatomic Hydrogen Molecular Ions
The triatomic hydrogen molecular ion H3+ is the simplest polyatomic molecule, besides its fundamental importance for quantum chemistry, it is one of the cornerstones of molecular processes in interstellar clouds. The dissociative electron recombination (DR) of H3+ is much studied, but still subject …
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