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Instruments > In Situ/Laboratory Instruments > Chemical Meters/Analyzers > HAL

Preferred term

HAL  

Definition

  • The Harvard Halogen instrument measures ClO and BrO in situ via a two-step process: chemical conversion to Cl and Br atoms via a rapid bimolecular reaction with NO, followed by atomic resonance fluorescence detection of Cl and Br in the vacuum ultraviolet. The instrument is located in the superpod forebody of the ER-2. The flow of ambient air through the instrument is controlled by a single primary bypass duct from which the laminar core is extracted and decelerated into two nested, mirror-image secondary ducts each with two axes for the detection of halogen radical species. The 4-axis design enables multiple ClO and BrO detectors to be present on each flight. (en)

Broader concept

Change note

  • 2021-12-03 09:06:22.0 [tstevens] Insert Concept add broader relation (HAL [0364f832-b1a8-4056-b811-51d3d1fc32ed,835968] - Chemical Meters/Analyzers [3d25724b-832f-4a61-b0b2-4f2ccecdba94,827335]);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/0364f832-b1a8-4056-b811-51d3d1fc32ed

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