Abstract
The problem of development of a singlet delta oxygen O<sub>2</sub>(<sup>1</sup>Δ<sub>g</sub>) (SDO) generators alternative to chemical one needs application of the accurate methods of measuring the SDO concentration. A chemical SDO generator providing efficient operation of a chemical oxygen-iodine laser (COIL) is proposed to be used as a reference source for absolute calibration of the system measuring the SDO concentration. The principle of the COIL operation results in the threshold and output COIL parameters make it possible to evaluate the SDO yield with a satisfactory accuracy. A convenient sparger chemical SDO generator was applied as a reference source for absolute calibration of detectors of dimole (λ=634nm) and b→X (λ=762 nm) radiations. The values of b-state concentration formed in a longitudinal electric discharge were evaluated. The intracavity laser spectroscopy (ICLS) was absolutely calibrated for measuring the SDO concentration. ICLS method has a very high sensitivity and makes it possible to monitor the absorption corresponding to the O<sub>2</sub>(<sup>1</sup>Δ<sub>g</sub>)→O<sub>2</sub>(<sup>1</sup>Σ<sub>g</sub><sup>+</sup>) (λ = 1.91 μm) transition. The cross-sections of lines of the <i>Q</i> - branch of the vibrational 0-0 band of the a<sup>1</sup>Δ<sub>g</sub> → b<sup>1</sup>Σ<sub>g</sub><sup>+</sup> transition of molecular oxygen were measured. The method developed was applied to measure the concentration of singlet oxygen produced in the microwave discharge. He - Ne laser (λ = 633 nm) was used for absolute calibration of a system monitoring the dimole radiation. The rate constant of the process responsible for dimole emission was measured. The value obtained <i>k</i><sub>d</sub>=7.34•10<sup>-23</sup> cm<sup>3</sup>/s is in agreement with literature.
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 callDisclaimer: 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.
