A pulse radiolysis based singlet oxygen luminescence facility

Journal Article · Wed Mar 01 04:00:00 EST 1989 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00187a051· OSTI ID:5885465

Gorman, A A; Hamblett, I; Land, E J

In this paper the authors report the first successful time-resolved detection of singlet oxygen, O/sub 2/(/sup 1//Delta//sub g/), luminescence using the pulse radiolysis technique. The use of this technique (a) to produce high concentrations of solute (S) triplet states in aerated benzene (B) via a combination of channels 1-4 and (b) to subsequently form O/sub 2/(/sup 1//Delta//sub g/) via channel 5 has already been described. The method complements direct pulsed laser excitation of S in that formation of /sup 3/S*, and therefore of O/sub 2/(/sup 1//Delta//sub g/), is still efficient in those instances where intersystem crossing (channel 4) is unimportant. In the latter situation a laser-based experiment would require an additional light-absorbing sensitizer which could subsequently transfer triplet energy to high concentrations of S. Such experiments, certainly of a quantitative nature, are usually doomed to failure because of competitive light absorption problems. No such problems exist with pulse radiolysis, and the high available triplet energy of /sup 3/B* (84 kcal mol/sup /minus/1/) ensures that virtually any solute of interest, in the O/sub 2/(/sup 1//Delta//sub g/) context, will be efficiently promoted to its triplet state.

• Research Organization: Univ. of Manchester (England)
• OSTI ID: 5885465
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 111:5; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400500* -- Photochemistry
400600 -- Radiation Chemistry
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
INFORMATION
LIFETIME
LUMINESCENCE
NONMETALS
NUMERICAL DATA
OXYGEN
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOLYSIS
SPECTROSCOPY