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Article Dans Une Revue Atmospheric Measurement Techniques Année : 2021

Development of a laser-photofragmentation laser-induced fluorescence instrument for the detection of nitrous acid and hydroxyl radicals in the atmosphere

Brandon Bottorff
  • Fonction : Auteur
Emily Reidy
  • Fonction : Auteur
Levi Mielke
  • Fonction : Auteur
Philip Stevens

Résumé

Abstract. A new instrument for the measurement of atmospheric nitrous acid (HONO) and hydroxyl radicals (OH) has been developed using laser photofragmentation (LP) of HONO at 355 nm after expansion into a low-pressure cell, followed by resonant laser-induced fluorescence (LIF) of the resulting OH radical fragment at 308 nm similar to the fluorescence assay by gas expansion technique (FAGE). The LP/LIF instrument is calibrated by determining the photofragmentation efficiency of HONO and calibrating the instrument sensitivity for detection of the OH fragment. In this method, a known concentration of OH from the photo-dissociation of water vapor is titrated with nitric oxide to produce a known concentration of HONO. Measurement of the concentration of the OH radical fragment relative to the concentration of HONO provides a measurement of the photofragmentation efficiency. The LP/LIF instrument has demonstrated a 1σ detection limit for HONO of 9 ppt for a 10 min integration time. Ambient measurements of HONO and OH from a forested environment and an urban setting are presented along with indoor measurements to demonstrate the performance of the instrument.

Dates et versions

hal-03380654 , version 1 (15-10-2021)

Identifiants

Citer

Brandon Bottorff, Emily Reidy, Levi Mielke, Sébastien Dusanter, Philip Stevens. Development of a laser-photofragmentation laser-induced fluorescence instrument for the detection of nitrous acid and hydroxyl radicals in the atmosphere. Atmospheric Measurement Techniques, 2021, 14 (9), pp.6039-6056. ⟨10.5194/amt-14-6039-2021⟩. ⟨hal-03380654⟩
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