Gas phase observation of the 1.27-μ emission of singlet delta oxygen generated at atmospheric pressure by heterogeneous photosensitization

✍ Scribed by Walter C. Eisenberg; Alan Snelson; James Veltman; Robert W. Murray

• Publisher: Elsevier Science
• Year: 1981
• Tongue: French
• Weight: 239 KB
• Volume: 22
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(01)92876-x

✦ Synopsis

Singlet oxygen was generated in the gas phase using heterogeneous photosensitization and atmospheric pressure. The emission of O2 ('Ag + 3Cg) at 1.27-u has been observed. We have recently reported the gas phase generation of singlet oxygen using heterogeneous photosensitization, intense illumination and atmospheric pressure.' Singlet oxygen ('Ag) was consistently produced in detectable quantities when air or oxygen was flowed through an irradiated tube coated with Rose Bengal. Evidence for 02('Ag) formation was obtained from chemical trapping, product distribution, and physical quenching experiments. We now report the gas phase observation of the 1.27-p emission of singlet delta oxygen formed by heterogeneous photochemical sensitization at atmospheric pressure.' The detection of the optical emissions from O*('Ag) to the ground state3 provides a rapid accurate method of identifying this excited state. The direct emissions occur at 1.27 and 1.58-p and correspond to the 'Ag (v=O) + 'Cg-(v=O) and the-lag (v=O) -+ 3Ag-(v=1) transi-