Relative quantum yield of I(/sup 2/P/sub 1/2/) in the tunable laser UV photodissociation of i-C/sub 3/F/sub 7/I and n-C/sub 3/F/sub 7/I: Effect of temperature and exciplex emission

Journal Article · Thu Sep 15 04:00:00 EDT 1983 · J. Chem. Phys.; (United States)

OSTI ID:5727332

Smedley, J E; Leone, S R

Wavelength-specific relative quantum yields of I from pulsed laser photodissociation of i-C/sub 3/F/sub 7/I and n-C/sub 3/F/sub 7/I in the range 265--336 nm are determined by measuring the time-resolved infrared emission (lambda = 1.315 ..mu..m) from the atomic I(/sup 2/P/sub 1/2/..-->../sup 2/P/sub 3/2/) transition. The quantum yields of I from i-C/sub 3/F/sub 7/I and n-C/sub 3/F/sub 7/I are constant and appear to be unity from 265--298 nm but decrease to 0.57 and 0.40, respectively, at 336 nm. The lower quantum yields suggest the existence of two distinct bands in this region of the absorption continua. To determine the quantum yields a correction is made for enhanced emission due to formation of exciplexes between I and the parent (i- or n-C/sub 3/F/sub 7/I) species. The exciplex emission increases linearly with parent gas pressure, but decreases with increasing temperature. For both molecules the integrated absorption in the long wavelength region (>290 nm) increases substantially with temperature, while at selected wavelengths the quantum yields are found to remain constant with temperature. The results are discussed in terms of the development of solar-pumped iodine lasers.

• Research Organization: Joint Institute for Laboratory Astrophysics, National Bureau of Standards, and Department of Chemistry, University of Colorado, Boulder, Colorado 80309
• OSTI ID: 5727332
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 79:6; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
CHEMICAL REACTIONS
DECOMPOSITION
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ELEMENTS
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
FEASIBILITY STUDIES
FLUORINATED ALIPHATIC HYDROCARBONS
GAS LASERS
HALOGENATED ALIPHATIC HYDROCARBONS
HALOGENS
INFRARED RADIATION
IODINATED ALIPHATIC HYDROCARBONS
IODINE
LASERS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
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ORGANIC IODINE COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATIONS
SPECTRA
TEMPERATURE EFFECTS