The cascaded arc : high flows of rovibrationally excited H2 and its impact on H- ion formation

O.G. Gabriel, W.E.N. Harskamp, van, D.C. Schram, M.C.M. Sanden, van de, R.A.H. Engeln

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Abstract

The cascaded arc is a plasma source providing high fluxes of excited and reactive species such as ions, radicals and rovibrationally excited mols. The plasma is produced under pressures of some kPa in a d.c. arc with elec. powers up to 10 kW. The plasma leaves the arc channel through a nozzle and expands with supersonic velocity into a vacuum-chamber kept by pumps at low pressures. We investigated the case of a pure hydrogen plasma jet with and without an applied axial magnetic field that confines ions and electrons in the jet. Highly excited mols. and atoms were detected by means of laser-induced fluorescence and optical emission spectroscopy. In case of an applied magnetic field the at. state distribution of hydrogen atoms shows an overpopulation between the electronic states p = 5, 4 and 3. The influence of the highly excited hydrogen mols. on H- ion formation and a possible mechanism involving this neg. ion and producing at. hydrogen in state p = 3 will be discussed.
Original languageEnglish
Title of host publicationNegative Ions, Beams and Sources : proceedings of the 1st international symposium on negativce ions, beams and sources
EditorsE. Surrey, A. Simonin
Place of PublicationNew York
PublisherAmerican Institute of Physics
Pages22-30
ISBN (Print)978-0-7354-0630-8
DOIs
Publication statusPublished - 2009
Eventconference; Negative Ions beams and sources : 1st international symposium; 2008-09-09; 2008-09-12 -
Duration: 9 Sep 200812 Sep 2008

Publication series

NameAIP Conference Proceedings
Volume1097
ISSN (Print)0094-243X

Conference

Conferenceconference; Negative Ions beams and sources : 1st international symposium; 2008-09-09; 2008-09-12
Period9/09/0812/09/08
OtherNegative Ions beams and sources : 1st international symposium

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