Emission spectra of CF3 radicals. I. UV and visible emission spectra of CF3 observed in the VUV photolysis and the metastable argon atom reaction of CF3H

Publisher Website
Google Scholar
Abstract
Two new emission bands of the CF3 radical were observed in the UV and visible regions. These emission bands were produced in the VUV photolysis of CF3H by argon resonance lines and also in the reaction of metastable argon atoms with CF3H. The UV emission bands are in the region from 180 to 300 nm. Vibrational and rotational relaxation occurred by the addition of three atmospheric pressures of helium as evidenced by the appearance of a discrete band structure. The visible emission bands are in the region 450–750 nm. The relaxation is observed by the addition of helium; however, no structure is observed in the visible emission bands (probably the band is a continuum). The sum of ΔH for the process CF3H→CF3+H and the energy of the short wavelength limit of the UV emission spectrum agree well with the energy of the incident light. It was suggested that the transition of the UV emission is from an electronically excited bound state to the ground state of CF3 and that of the visible emission is from an electronically excited bound state to an electronically excited lower repulsive state. The spectral region of the UV emission band agreed well with the absorption spectrum of CF3 observed by Glänzer et al.