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The interaction of HCl with water‐ice at tropospheric temperatures
Author(s) -
Hynes Robert G.,
Mössinger Juliane C.,
Cox R. Anthony
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl012706
Subject(s) - molecule , analytical chemistry (journal) , hydrochloric acid , torr , chemistry , saturation (graph theory) , troposphere , environmental chemistry , inorganic chemistry , thermodynamics , atmospheric sciences , geology , physics , organic chemistry , mathematics , combinatorics
The uptake of HCl on frozen film ice surfaces was studied as a function of temperature and HCl partial pressure ( P HCl ) in a flow reactor. The temperatures ranged from 205 to 230 K, and P HCl was (0.4–2.0) × 10 −6 Torr. The initial uptake coefficients, γ, and the HCl surface coverage are reported. It was observed that the coverage varied from 3.0 × 10 14 molecules/cm² at 205 K to 1.0 × 10 14 molecules/cm² at 230 K. At 205 K the coverage showed no dependence on P HCl ; the average surface coverage was ∼ (2.0±0.7) ×10 14 molecules/cm² at saturation. This value is consistent with other studies on similarly prepared ice films. It was found that γ ∼0.1 at 205 K, but decreased substantially when the temperature increased; however, γ was insensitive to P HCl .