We measure the diamagnetic deflection of anthracene and adamantane in a long-baseline matter-wave interferometer. From the nanometer-level deflection we extract the magnetic susceptibilities of the molecules which we compare with calculations and previous results. Adamantane yields an isotropic average mass susceptibility of -8.0 ± 1.1 m kg, consistent with expectations, while anthracene yields a higher-than-anticipated value of -13.6 ± 1.3 m kg. We attribute the high anthracene value to the planar aromatic molecule's magnetic anisotropy and partial alignment in the molecular beam, and estimate the magnitude of the effect on the observed deflection.
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http://dx.doi.org/10.1039/d0cp02211j | DOI Listing |
Phys Chem Chem Phys
May 2024
Technical University of Darmstadt, Eduard-Zintl-Institute, Peter-Grünberg-Straße 8, 64287 Darmstadt, Germany.
In this work, the magnetic properties of tetrel clusters SnTM, which are singly doped with transition metals (TM), are investigated. On the one hand, the number of tetrel atoms ( = 11, 12, 14 and 17 with TM = Mn) is varied; on the other hand, different transition metals ( = 14, TM = Cr, Mn, Fe) are studied. Magnetic deflection experiments under cryogenic conditions show that the variation of the number of tetrel atoms strongly changes the magnetic properties of the Mn-doped clusters.
View Article and Find Full Text PDFJ Phys Chem A
October 2023
Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 2, Zürich 8093, Switzerland.
Using a pulsed Stern-Gerlach deflection experiment, we present the results of a comparative study on the magnetic properties of neutral sodium-doped solvent clusters Na(Sol) with = 1-4 (Sol: HO, NH, CHOH, CHOCH). Experimental deflection ratios are compared with values calculated from molecular dynamics simulations. NaNH and NaHO are deflected as a spin 1/2 system, consistent with spin transitions occurring on a time scale significantly longer than 100 μs.
View Article and Find Full Text PDFPhys Chem Chem Phys
January 2021
Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, 8093, Switzerland.
We describe the setup and the performance of a new pulsed Stern-Gerlach deflector and present results for small sodium-doped ammonia clusters Na(NH3)n (n = 1-4) in a molecular beam. NaNH3 shows the expected deflection of a spin ½ system, while all lager clusters show much smaller deflections. Experimental deflection ratios are compared with the values calculated from molecular dynamics simulations.
View Article and Find Full Text PDFNanotechnology
November 2020
CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China.
Friction measurement via atomic force microscope (AFM) relies on accurate calibration for the torsional spring constant of the AFM cantilever and its lateral deflection sensitivity. Here we describe a method that employs a suspended nanowire (SNW) as a reference beam to quantify the torsional spring constant of AFM cantilevers. Based on the fact that a uniform SNW with cylindrical symmetry has an identical spring constant when bent in any direction perpendicular to its axis, the spring constant of the SNW in a normal direction is determined by an AFM cantilever with a known normal spring constant, and is subsequently used as a force transfer standard to calibrate the torsional spring constant of the AFM cantilever.
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