Studies of fluorescence from photoexcitation of N 2 and CO 2 in the 28–100 eV region

Abstract

Fluorescence excitation functions produced through photoexcitation of N 2 and CO 2 using synchrotron radiation in the range 28–100 eV have been studied. Two broadband detectors were employed to simultaneously monitor fluorescence in the 1080–3000 Å and 3000–7000 Å regions, respectively. Broad fluorescence peaks are observed and are interpreted in terms of dissociative ionization excitation of multiple electronic states, ion states and Rydberg states converging to multiply charged N 2 and CO 2 (i.e., N 2 m+ and CO 2 m+ for m=1−3). We have also studied the temperature effect on the relative fluorescence yield of CO 2 in the 28–60 eV region. It was found that the VUV fluorescence yields in the 28–40 eV region increase as sample temperature increases from 295 K to 650 K suggesting that the fluorescence produced by photon excitation of CO 2 hot bands may be important.