Abstract

Coal and polycyclic aromatic hydrocarbon (PAH) fluorescence was excited by 442 nm laser light at flux density of ≈ 27 kW/m 2. Illuminating various coals in vacuum at ≈ 1 Pa caused a small decrease in their fluorescence. In air or oxygen a very rapid decrease in fluorescence was followed by slow fluorescence growth. This growth was faster for lower rank coals. Physically reversible oxygen attachment enhanced the fluorescence. Similar results were obtained with anthracene, phenanthrene and pentacene layers. A photo-reaction mechanism is proposed to explain features of the positive alteration of coal and PAH fluorescence in oxygen.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.