- 作者: Hsu, Chia-Wei ; Liao, Chung-Lin ; Ng, Cheuk-Yiu
- 作者服務機構: Ames Laboratory, U.S. Dept. of Energy and Dept. of Chemistry, Iowa State Univ., Ames, Iowa, U.S.A.
- 中文摘要: The dynamics of S(/sup 3/P/sub 2,1,0/; /sup 1/ D/sub 2/; /sup 1/S/sub 0/) production from the 193nm photodissociation of CH/sub 3/SH has been examined by 2+1 resonance-enhanced-multiphoton-ionization (REMPI) techniques. Using the rate equation scheme , we have rationalized the intensities of S(/sup 3/P/sub 2,1,0/;/sup 1/D/sub 2/; /sup 1/S/sub 0/) observed according to the sequential two-photon dissociative pathways, (A): CH/sub 3/ SH+h.nu. (193nm).arrr.CH/sub 3/S+h.nu. (193nm).arrr.S and(B): CH/ sub 3/SH+h.nu. (193nm).arrr.HS+h.nu. (193nm).arrr.S, as the major mechanisms for S production. We have satisfactorily fitted the photodissociation laser power dependencies for S(/sup 3/P) and S(/sup 1/D) produced from CH/sub 3/SH by invoking photodissociation cross sections and branching ratios S(/sup 3/P)/S(/sup 1/D) for CH/sub 3/S and HS similar to those determined previously in the 193nm photodissociation of CH/sub 3/SCH/sub 3/ and H/sub 2/S. This observation supports that the 193nm photodissociation of CH/sub 3/S and HS prepared from CH/sub 3/SH yield predominantly S(/sup 1/D) and S(/sup 3/P), similar to the cases for CH/sub 3/S prepared from CH/sub 3/SCH/sub 3/ and for HS prepared from H/sub 2/S, respectively. A small amount of S(/sup 1/S/sub 0/) observed from the 193nm photodissociation of CH/sub 3/SH is attributed to pathway(B).
- 英文摘要: --
- 中文關鍵字: Photodissociation; Methanethiol; Dynamics; Resonance Enhanced Multiphoton Ionization Technique; Mechanism
- 英文關鍵字: 光解離;甲硫醇;動力學;光振增強多光子離子化技術;反應機構