Photodissociation quantum yields of CO2 between 1200 and 1500 Å

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Abstract
Measurements of the photodissociation quantum yields of CO2 have been carried out using various atomic line sources between 1200 and 1500 Å. The production of CO was monitored by resonance fluorescence, and the results indicate that where the CO2 absorption spectrum is continuous, the CO quantum yield is high, but where there is structure, the yield is low. At the commonly employed 1236 Å resonance line, the CO quantum yield is 0.85±0.17, relative to the absolute value at 1470 Å of 0.75 obtained by Inn. On the same scale, the other values are (a) 1216 Å, 0.57 ±0.11, (b) 1302–1306 Å, 0.21±0.07, (c) ∼1390 Å, 0.46±0.05, (d) 1492–1495 Å, 0.58±0.06. The CO2 pressures employed were in the range 0.4–4.0 Torr. If these same quantum yields are valid at the pressures of the Mars and Venus atmospheres, the CO and O atom production rates are less than presently assumed.

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