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Title: Measurement of the lowest millimeter-wave transition frequency of the CH radical

The CH radical offers a sensitive way to test the hypothesis that fundamental constants measured on Earth may differ from those observed in other parts of the universe. The starting point for such a comparison is to have accurate laboratory frequencies. Here, we measure the frequency of the lowest millimeter-wave transition of CH, near 535 GHz, with an accuracy of 0.6 kHz. This improves the uncertainty by roughly two orders of magnitude over previous determinations and opens the way for sensitive new tests of varying constants.
Authors:
; ; ;  [1]
  1. Center for Cold Matter, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW72AZ (United Kingdom)
Publication Date:
OSTI Identifier:
22348325
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 780; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; CARBON COMPOUNDS; COMPARATIVE EVALUATIONS; COSMOLOGY; FUNDAMENTAL CONSTANTS; GHZ RANGE; HYDROGEN COMPOUNDS; HYPOTHESIS; RADICALS; UNIVERSE