Fluorescence and thermoluminescence of N2O, CO, and CO2 in an argon matrix at low temperature

Abstract

Low lying electronic states of rare gas-oxide anions: Photoelectron spectroscopy of complexes of O − with Ar, Kr, Xe, and N 2

Experimental study of the formation of molecular hydrogen and carbon dioxide on dust grain analogues

“…Tielens and Hagen (1982) used extensive Monte Carlo modeling to study the CO + O reaction on grains. Assuming an activationless reaction, in agreement with experiments of Fournier et al (1979), they suggested that carbon dioxide in ices is ubiquitous and abundant, a view that has been confirmed by ISO. In their experiments Fournier et al (1979) irradiated a mixture of N 2 O/CO/Ar (with a mole ratio of 1:1:330) with $8.4 eV photons with the mixture temperature at $7 K. They interpreted their data as if O( 1 S) atoms, photolytically produced with enough kinetic energy, diffuse and react with CO to yield CO 2 .…”

“…In a similar experiment Grim and dÕHendecourt (1986) found no appreciable quantities of CO 2 and concluded that there is an activation energy barrier for the reaction to occur. In both experiments of Fournier et al (1979) and of Grim and dÕHendecourt (1986) oxygen atoms are obtained by dissociating O 2 with UV photons, a mechanism that might yield excited radicals and render the simulation somewhat more distant from quiescent cloud conditions. In the most recent photoproduction measurements, Watanabe and Kouchi (2002a) studied CO 2 formation in both H 2 O/CO and D 2 O/CO mixtures and discovered no isotope effect in the CO 2 production rate from these ices.…”

Solid Carbon Dioxide in Regions of Low‐Mass Star Formation

“…Experiments indicate that reaction (3) may possess a signiÐ-cant activation energy barrier , although this is in contrast to earlier results by Fournier et al (1979). If there is indeed a signiÐcant activation barrier, quantum mechanical tunneling could still make this reaction proceed at the low temperatures of interstellar ice mantles, but the reaction probability will depend on the magnitude of the barrier.…”

Diffusion-limited geminate recombination of O+O2 in solid xenon

“…From the very beginning of the development of the matrix isolation technique, 2 experiments provided abundant qualitative evidence that small atoms ͑N, 3 O, 4 F, 5 and S 6 ͒ can be thermally mobilized in rare gas matrices at cryogenic temperatures. Typically, the mobility is manifested by simple addition or abstraction reactions of the atoms under study.…”