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  A compact hexapole state-selector for NO radicals

Kirste, M., Haak, H., Meijer, G., & Meerakker, S. Y. T. v. d. (2013). A compact hexapole state-selector for NO radicals. Review of Scientific Instruments, 84(7): 073113. doi:10.1063/1.4812267.

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Kirste-rsi-paper-hexapole.pdf (beliebiger Volltext), 2MB
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 Urheber:
Kirste, Moritz1, Autor           
Haak, Henrik1, Autor           
Meijer, Gerard1, Autor           
Meerakker, Sebastiaan Y. T. van de1, 2, Autor           
Affiliations:
1Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              
2Radboud University Nijmegen, Institute for Molecules and Materials, ou_persistent22              

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Schlagwörter: fluorescence, molecular beams, nitrogen compounds, optical focusing
 Zusammenfassung: Focusing of molecular beams using an electrostatic hexapole is a mature technique to produce samples of state-selected molecules. The ability to efficiently focus molecules depends on the properties of the molecular species of interest, the length of the hexapole state selector, as well as on the maximum electric field strength that can be achieved in these devices. In particular for species with a small effective dipole moment such as nitric oxide (NO), hexapole state selectors of several meters in length are required to focus the beam. We report on a novel design for an electrostatic hexapole state-selector that allows for a maximum electric field strength of 260 kV/cm, reducing significantly the length of the hexapole that is required to focus the beam. We demonstrate the focusing of a molecular beam of NO radicals (X 2Π1/2, v = 0, J = 1/2, f) using a hexapole of only 30 cm length. A beamstop is integrated inside the hexapole at the geometric center of the device where the molecular trajectories have the largest deviation from the beam axis, effectively blocking the carrier gas of the molecular beam at minimum loss of NO density. The performance of the hexapole state-selector is investigated by state-selective laser induced fluorescence detection, as well as by two-dimensional imaging of the focused packet of NO radicals. The resulting packet of NO radicals has a density of 9 ± 3 × 1010 cm-3 and a state purity of 99%

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Sprache(n): eng - English
 Datum: 2013-04-232013-06-112013-07-252013-07
 Publikationsstatus: Erschienen
 Seiten: 9
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1063/1.4812267
 Art des Abschluß: -

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Titel: Review of Scientific Instruments
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Woodbury, N.Y. [etc.] : American Institute of Physics
Seiten: - Band / Heft: 84 (7) Artikelnummer: 073113 Start- / Endseite: - Identifikator: ISSN: 0034-6748
CoNE: https://pure.mpg.de/cone/journals/resource/991042742033452