Experimental determination and calculation of the collision relaxation rates in the 5 sup 2 P sub 1/2 and 5 sup 2 P sub 3/2 levels of atomic iodine

Journal Article · Tue Oct 15 04:00:00 EDT 1991 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.461601· OSTI ID:5151724

Cerny, D; Bacis, R; Bussery, B; Nota, M ^[1]; Verges, J ^[2]

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1. Laboratoire de Spectrometrie Ionique et Moleculaire, Universite Lyon I, Batiment 205, 43, boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex (France)
2. Laboratoire Aime Cotton, Batiment 505, Campus d'Orsay, CNRS II, 91405 Orsay Cedex (France)

Pressure broadening of the hyperfine lines of the {sup 2}{ital P}{sub 1/2} --{sup 2}{ital P}{sub 3/2} atomic iodine transition is analyzed from the emission line shapes. Collisions with Ar and O{sub 2} in the 0--100 Torr range were examined as well as pressure broadening due to I{sub 2} in the 0--15 Torr range. Pressure broadening coefficients {alpha} were determined: {alpha} (O{sub 2})=4.8 (3) MHz/Torr and {alpha} (Ar)=3.6 (3) MHz/Torr. In the case of I{sub 2}, {alpha} (I{sub 2}) is estimated to be (35{plus minus}10) MHz/Torr in the 0--5 Torr range. In addition, pressure broadening coefficients were calculated using the impact approximation. In this approximation relaxation cross sections are calculated between hyperfine levels of the I atom. Estimates of the relaxation rates between the hyperfine levels of I({sup 2}{ital P}{sub 3/2}) and I({sup 2}{ital P}{sub 1/2}) are deduced from these results, for both elastic and inelastic processes. Experimental and theoretical results are in reasonable agreement.

• OSTI ID: 5151724
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 95:8; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
COLLISIONS
CROSS SECTIONS
ELEMENTS
ENERGY LEVELS
FLUIDS
GASES
HALOGENS
HYPERFINE STRUCTURE
IODINE
LINE BROADENING
LOW PRESSURE
MOLECULE COLLISIONS
NONMETALS
OXYGEN
P STATES
PRESSURE EFFECTS
RARE GASES
RELAXATION