Laser excited fluorescence of CH in a low pressure flame

✍ Scribed by S.V. Filseth; H. Zacharias; J. Danon; R. Wallenstein; K.H. Welge

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 392 KB
• Volume: 58
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(78)80334-0

✦ Synopsis

Production of CH(X'R) in a loa-Pressure H/O&H2 flame has been observed by laser excited fluorescence in the 0,O band of the AaA + X'II system at 431 mn. Laser excitation sPeeua have been recorded of the P, Q, and R branches with a bandwidth of 0.03 nm and of the head of the Q branch with a bandwidth of 0.0009 mn. Values of the spin-orbit and spin-rotation coupling constants in the A*A state have been obtained. 1 _ Introduction Chemihuninescence due to CH(A*A) is the strongest visiile feature of the oxygen/acetylene flame and a dominant feature of ah hydrocarbon combusticns. Despite the weIl characterized nature of this emission [I], it is still not clear which elementary chemical processes Iead to the production of the excited state. Prcsumably, CH in the electronic ground state, X2iJ, is present at much greater concentrations in these combustion systems. BIec-krode and Nieuwpoort estimated