Femtosecond photodissociation dynamics of 1,1,1-trifluoro-2-iodoethane in the Franck-Condon region
文献类型：期刊论文
| 作者 | Kwok, WM; Ng, PK; He, GZ; Phillips, DL |
| 刊名 | MOLECULAR PHYSICS
 |
| 出版日期 | 1997 |
| 卷号 | 90期号:1页码:127-139 |
| ISSN号 | 0026-8976 |
| 文献子类 | Article |
| 英文摘要 | We report resonance Raman spectra of 1,1,1-trifluoro-2-iodoethane in cyclohexane taken with excitation wavelengths within the A-band absorption. The experimental A-band resonance Raman intensities and absorption spectrum were simulated using time-dependent wavepacket calculations and a simple model. The results of the time-dependent wavepacket calculations were used in conjunction with the normal mode descriptions found from normal coordinate calculations to obtain the short-time photodissociation dynamics (at 15 fs) of 1,1,1-trifluoro-2-iodoethane. The short-time photodissociation dynamics of 1,1,1-trifluoro-2-iodoethane has a large amount of multidimensional character and is qualitatively consistent with an impulsive 'semi-rigid' radical model of the photodissociation dynamics that shows the CF3CH2 radical going towards a more planar geometry about the CH2 carbon atom as the C-I bond is being broken. Our resonance Raman intensity analysis indicates that in the beginning stages of the photodissociation in the Franck-Condon region the C-C bond becomes longer, the CCI angle becomes smaller, the HCH and CCH angles become larger, two of the FCC angles (out of the CCI plane) become larger while the third FCC angle (in the CCI plane) becomes smaller, and there is some motion in the FCF angles and C-F bond lengths that is either positive or negative in sign, depending on the sign combination of the normal mode displacements. We also compare the photodissociation dynamics of 1,1,1-trifluoro-2-iodoethane with that of iodoethane. |
| WOS关键词 | RESONANCE RAMAN-SPECTROSCOPY ; TERT-BUTYL IODIDE ; METHYL-IODIDE ; PHOTOFRAGMENTATION DYNAMICS ; 248 NM ; EMISSION-SPECTROSCOPY ; QUANTUM YIELDS ; ALKYL IODIDES ; A-BAND ; UMBRELLA MODE |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:A1997WF61700015 |
| 出版者 | TAYLOR & FRANCIS LTD |
| 源URL | [http://cas-ir.dicp.ac.cn/handle/321008/168200]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 通讯作者 | Kwok, WM |
| 作者单位 | CHINESE ACAD SCI,DALIAN INST CHEM PHYS,DALIAN 116023,PEOPLES R CHINA |
| 推荐引用方式 GB/T 7714 | Kwok, WM,Ng, PK,He, GZ,et al. Femtosecond photodissociation dynamics of 1,1,1-trifluoro-2-iodoethane in the Franck-Condon region[J]. MOLECULAR PHYSICS,1997,90(1):127-139. |
| APA | Kwok, WM,Ng, PK,He, GZ,&Phillips, DL.(1997).Femtosecond photodissociation dynamics of 1,1,1-trifluoro-2-iodoethane in the Franck-Condon region.MOLECULAR PHYSICS,90(1),127-139. |
| MLA | Kwok, WM,et al."Femtosecond photodissociation dynamics of 1,1,1-trifluoro-2-iodoethane in the Franck-Condon region".MOLECULAR PHYSICS 90.1(1997):127-139. |
入库方式： OAI收割
来源：大连化学物理研究所
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