Spin-forbidden excitation of CF2(ã 3B1 ← X̃ 1A1) by collisions with N2(A 3Σu+)

✍ Scribed by Katsuyoshi Yamasaki; Aki Tanaka; Ikuo Tokue; Yoshio Ito

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 454 KB
• Volume: 215
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)85706-t

✦ Synopsis

The excitation-transfer reaction between Ns(A 'Z: ) and CFs(8 'A,) has been studied in a discharge-flow reactor. Dispersed emission spectra show that the spin-forbidden excitation CFs(H 'B, +x 'Ai ) is favored over the spin-allowed transition CF, (A 'Bi +% 'A, ) . The selectivity is discussed in terms of conservation of total electronic spin and energy defect in the transfer process. The present observation is the first successful excitation of a carbene by energy-transfer from Ns (A 'Z $ ) . Several reasons for the previous lack of success (Cao and Setser) are found from careful comparison of the concentrations of reagents and power of the discharge.