A versatile, pulsed anion source utilizing plasma-entrainment: characterization and applications

A novel pulsed anion source has been developed, using plasma entrainment into a supersonic expansion. A pulsed discharge source perpendicular to the main gas expansion greatly reduces unwanted "heating" of the main expansion, a major setback in many pulsed anion sources in use today. The d...

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Bibliographic Details
Published in:The Journal of chemical physics 2015-01, Vol.142 (4), p.044201-044201
Main Authors: Lu, Yu-Ju, Lehman, Julia H, Lineberger, W Carl
Format: Article
Language:English
Subjects:
ANIONS
CARBON MONOXIDE
COMPARATIVE EVALUATIONS
Entrainment
Gas expansion
HEATING
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MOLECULAR CLUSTERS
PHOTOELECTRON SPECTROSCOPY
Physics
PLASMA EXPANSION
SOLVATION
Spectrum analysis
SYNTHESIS
TRANSIENTS
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Description
Summary:A novel pulsed anion source has been developed, using plasma entrainment into a supersonic expansion. A pulsed discharge source perpendicular to the main gas expansion greatly reduces unwanted "heating" of the main expansion, a major setback in many pulsed anion sources in use today. The design principles and construction information are described and several examples demonstrate the range of applicability of this anion source. Large OH(-)(Ar)n clusters can be generated, with over 40 Ar solvating OH(-). The solvation energy of OH(-)(Ar)n, where n = 1-3, 7, 12, and 18, is derived from photoelectron spectroscopy and shows that by n = 12-18, each Ar is bound by about 10 meV. In addition, cis- and trans- HOCO(-) are generated through rational anion synthesis (OH(-) + CO + M → HOCO(-) + M) and the photoelectron spectra compared with previous results. These results, along with several further proof-of-principle experiments on solvation and transient anion synthesis, demonstrate the ability of this source to efficiently produce cold anions. With modifications to two standard General Valve assemblies and very little maintenance, this anion source provides a versatile and straightforward addition to a wide array of experiments.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4906300