Raspe K, Müller M, Iwe N, Wolf RN, Oelßner P, Martinez F, Schweikhard L, Meiwes-Broer KH, Tiggesbäumker J. A versatile setup for studying size and charge-state selected polyanionic nanoparticles.
THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022;
93:043301. [PMID:
35489944 DOI:
10.1063/5.0085187]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 03/09/2022] [Indexed: 06/14/2023]
Abstract
Using the example of metal clusters, an experimental setup and procedure is presented, which allows for the generation of size and charge-state selected polyanions from monoanions in a molecular beam. As a characteristic feature of this modular setup, the further charging process via sequential electron attachment within a three-state digital trap takes place after mass-selection. In contrast to other approaches, the rf-based concept permits access to heavy particles. The procedure is highly flexible with respect to the preparation process and potentially suitable for a wide variety of anionic species. By adjusting the storage conditions, i.e., the radio frequency, to the change in the mass-to-charge ratio, we succeeded in producing clusters in highly negative charge states, i.e., Ag800 7-. The capabilities of the setup are demonstrated by experiments extracting electronic and optical properties of polyanionic metal clusters by analyzing the corresponding photoelectron spectra.
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