(a) Support of grid in Ni clamp with welded thermocouple, showing 90° angle between Lyman-α and IR beam. (b) Side view of a section of the tungsten grid at high magnification showing pressed KBr support for ice condensation. Condensation occurs preferentially on one side of the KBr support as a result of dosing from a beam in the IR/UV cell.
Photolysis of 50%-50% isotopomer CO2 (ice) by Lyman-α radiation at 75 K.
CO(Tr) and CO3(Tr) product formation from CO2(ice) – 50%-50%.
Product isotopic ratios during UV-irradiation.
Relative rate of depletion of 50%-50% 12CO2 and 13CO2 by UV-irradiation.
Comparison of photoexcitation of CO2(ice) and adsorbed CO2 on surfaces. The matrix of the CO2(ice) is represented by dots. In (a), the CO2(ice) matrix participates in quenching the electronically-excited CO2*. In (b), the solid surface participates in quenching the adsorbed molecule following electronic excitation.
Reaction, desorption, and vibrational relaxation channels in CO2(ice) excited by UV-irradiation.
Schematic diagram of CO2 photoprocesses for Lyman-α excitation of CO2(ice).
Infrared absorptions of the isotopic CO2 ices and their assignments.
Cross sections for Lyman-α induced photoprocesses in 50%-50% 12CO2–13CO2(ice) at 75 K.
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