Motivated by the detection of infrared absorption bands from atmospheric cluster ions in laboratory experiments, a narrowband filter radiometer has been constructed for ion detection in the atmosphere. It uses a filter centered at 9.15 mum wavelength with 5% bandwidth, protected by a diamond-like-carbon coated germanium auxiliary filter, and fitted to a standard pyrradiometer. A sensitivity of (29.3+/-0.1) microV/(W m(-2)) has been determined in a laboratory calibration using a blackbody sour...Expand abstract
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An infrared filter radiometer for atmospheric cluster-ion detection.
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