Absorption Cross Sections of Carbon Dioxide and Carbon Monoxide in the Vacuum Ultraviolet

Publisher Website
Google Scholar
Abstract
Absorption cross sections of CO2 and CO in the region from 1306 A to 374 A have been measured. The absorption spectrum of CO2 consists of strong resonance bands between 1306 A and 700 A, with one of them at 923 A showing an unusually large cross section of 117×10—18 cm2. A continuum with bands superimposed on it was observed to start at about 860 A or 14.4 ev which corresponded to the first ionization potential of CO2. From 700 A toward shorter wavelengths, the contour of the continuum was better defined and smooth with a broad maximum of 36×10—18 cm2 at 550 A and a total f‐value of 4.4. The CO absorption between 1306 A and 955 A was less than 10—18 cm2. Prominent resonance bands appeared at 924 A and extended to 600 A. An absorption continuum could be identified between 876 A and 374 A showing maximum values of σ≃19×10—18 cm2 between 750 A and 550 A with perhaps a small dip of 15×10—18 cm2 at 644 A. The f‐value of this continuum was 2.8.