We describe two improvements to an existing tandem mass spectrometer coupled to a laser vaporization cluster ion source suitable for photodissociation spectroscopy: (i) cooling of the cluster source nozzle and (ii) mass selection prior to the photodissociation region via replacing an octupole ion guide by a quadrupole mass spectrometer. The improved sensitivity and transmission enable the production of larger heteroatomic clusters as well as rare gas solvated clusters. We present two examples demonstrating the new capabilities of the improved setup. In the first application, cooling of the cluster source nozzle produces Si+Arn and Si2+Arn cluster cations with n = 1-25. Magic numbers are extracted from the mass spectrum by applying a transmission function obtained via simulations. In the second example, the vibronic photodissociation spectrum of cold Au4+ cluster ions is recorded with unprecedented detail, resolution, and sensitivity. Such high-resolution optical excitation spectra of metal cluster cations may serve as a benchmark for the performance of Franck-Condon simulations based on quantum chemical calculations for excited states.
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December 2017
Research Article|
December 18 2017
Improved tandem mass spectrometer coupled to a laser vaporization cluster ion source
Marko Förstel
;
Marko Förstel
a)
Institut für Optik und Atomare Physik, Technische Universität Berlin
, Hardenbergstraße 36, D-10623 Berlin, Germany
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Bertram K. A. Jaeger;
Bertram K. A. Jaeger
Institut für Optik und Atomare Physik, Technische Universität Berlin
, Hardenbergstraße 36, D-10623 Berlin, Germany
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Wolfgang Schewe;
Wolfgang Schewe
Institut für Optik und Atomare Physik, Technische Universität Berlin
, Hardenbergstraße 36, D-10623 Berlin, Germany
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Philipp H. A. Sporkhorst;
Philipp H. A. Sporkhorst
Institut für Optik und Atomare Physik, Technische Universität Berlin
, Hardenbergstraße 36, D-10623 Berlin, Germany
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Otto Dopfer
Otto Dopfer
a)
Institut für Optik und Atomare Physik, Technische Universität Berlin
, Hardenbergstraße 36, D-10623 Berlin, Germany
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a)
Authors to whom correspondence should be addressed: markof@physik.tu-berlin.de and dopfer@physik.tu-berlin.de
Rev. Sci. Instrum. 88, 123110 (2017)
Article history
Received:
October 27 2017
Accepted:
November 29 2017
Citation
Marko Förstel, Bertram K. A. Jaeger, Wolfgang Schewe, Philipp H. A. Sporkhorst, Otto Dopfer; Improved tandem mass spectrometer coupled to a laser vaporization cluster ion source. Rev. Sci. Instrum. 1 December 2017; 88 (12): 123110. https://doi.org/10.1063/1.5010853
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