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Title: Experimental cell for molecular beam deposition and magnetic resonance studies of matrix isolated radicals at temperatures below 1 K

We present the design and performance of an experimental cell constructed for matrix isolation studies of H and D atoms in solid H{sub 2}/D{sub 2} films, which are created by molecular beam deposition at temperatures below 1 K. The sample cell allows sensitive weighing of the films by a quartz microbalance (QM) and their studies by magnetic resonance techniques in a strong magnetic field of 4.6 T. We are able to regulate the deposition rate in the range from 0.01 to 10 molecular layers/s, and measure the thickness with ≈0.2 monolayer resolution. The upper QM electrode serves as a mirror for a 128 GHz Fabry-Perot resonator connected to an electron spin resonance (ESR) spectrometer. H and D atoms were created by RF discharge in situ in the sample cell, and characterized by ESR and electron-nuclear double resonance. From the magnetic resonance measurements we conclude that the films are smooth and provide homogeneous trapping conditions for embedded atoms. The current sample cell design also makes it possible to calibrate the ESR signal and estimate the average and local concentrations of H and D radicals in the film.
Authors:
; ; ; ; ;  [1] ; ; ;  [2]
  1. Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku (Finland)
  2. Department of Physics and Astronomy and Institute for Quantum Science and Engineering, Texas A and M University, College Station, Texas 77843 (United States)
Publication Date:
OSTI Identifier:
22308866
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABUNDANCE; DEPOSITION; DEUTERIUM; ELECTRODES; ELECTRON SPIN RESONANCE; ENDOR; HYDROGEN; LAYERS; MAGNETIC FIELDS; MICROBALANCES; MOLECULAR BEAMS; QUARTZ; RADICALS; RESOLUTION; SPECTROMETERS; TEMPERATURE RANGE 0000-0013 K; THICKNESS; THIN FILMS; TRAPPING