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The effect of laser pulse duration on atmospheric pressure IR-MALDI using liquid matrices

  • Matrix assisted laser desorption/ionization using liquid matrices and infrared laser irradiation (liquid IR-MALDI) is an attractive detection scheme since it enables a direct coupling to liquid chromatographic separation techniques.1 Albeit extensive studies have been targeted to achieve a more general understanding of the underlying ionization mechanism, the exact role of individual contributions, such as thermal vaporization, phase explosion or photoablation, could not be exhaustively identified.2 This contribution will present a direct comparison of ion mobility (IM) spectra obtained by utilizing an optical parametric oscillator and an Er:YAG laser, both operating at a central wavelength of = 2.94 µm, but with temporal pulse widths of 7 ns or several hundred µs, respectively. Thus, the resulting peak power of the Er:YAG laser is three orders of magnitude smaller than that of the OPO, however supplies a tenfold higher energy per pulse. In addition to the mere detectionMatrix assisted laser desorption/ionization using liquid matrices and infrared laser irradiation (liquid IR-MALDI) is an attractive detection scheme since it enables a direct coupling to liquid chromatographic separation techniques.1 Albeit extensive studies have been targeted to achieve a more general understanding of the underlying ionization mechanism, the exact role of individual contributions, such as thermal vaporization, phase explosion or photoablation, could not be exhaustively identified.2 This contribution will present a direct comparison of ion mobility (IM) spectra obtained by utilizing an optical parametric oscillator and an Er:YAG laser, both operating at a central wavelength of = 2.94 µm, but with temporal pulse widths of 7 ns or several hundred µs, respectively. Thus, the resulting peak power of the Er:YAG laser is three orders of magnitude smaller than that of the OPO, however supplies a tenfold higher energy per pulse. In addition to the mere detection efficiencies, analysis of the IM spectrometric results gives insights into the initial solvation state of the formed ions. Accompanying high speed shadowgraphy imaging experiments contribute towards a better understanding of the involved liquid-gas phase transition dynamics.zeige mehrzeige weniger

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Metadaten
Autor*innen:Aleksandra Michalik-Onichimowska
Koautor*innen:Jens Riedel, Ulrich Panne, Hans-Gerd Löhmannsröben, Toralf Beitz
Dokumenttyp:Posterpräsentation
Veröffentlichungsform:Präsentation
Sprache:Deutsch
Titel des übergeordneten Werkes (Deutsch):Bunsentagung 2015
Jahr der Erstveröffentlichung:2015
Veranstaltung:Bunsentagung 2015
Veranstaltungsort:Bochum
Beginndatum der Veranstaltung:2015-05-14
Enddatum der Veranstaltung:2015-05-16
Verfügbarkeit des Dokuments:Weder Datei noch physisches Exemplar vorhanden ("No Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Nein
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