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Article: Femtosecond photodissociation dynamics of 1,1,1-trifluoro-2-iodoethane in the Franck-Condon region
Title | Femtosecond photodissociation dynamics of 1,1,1-trifluoro-2-iodoethane in the Franck-Condon region |
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Authors | |
Issue Date | 1997 |
Publisher | Taylor & Francis Ltd. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/00268976.asp |
Citation | Molecular Physics, 1997, v. 90 n. 1, p. 127-139 How to Cite? |
Abstract | 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 CF 3CH 2 radical going towards a more planar geometry about the CH 2 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. |
Persistent Identifier | http://hdl.handle.net/10722/70354 |
ISSN | 2023 Impact Factor: 1.6 2023 SCImago Journal Rankings: 0.326 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kwok, WM | en_HK |
dc.contributor.author | Ng, PK | en_HK |
dc.contributor.author | He, GZ | en_HK |
dc.contributor.author | Phillips, DL | en_HK |
dc.date.accessioned | 2010-09-06T06:22:05Z | - |
dc.date.available | 2010-09-06T06:22:05Z | - |
dc.date.issued | 1997 | en_HK |
dc.identifier.citation | Molecular Physics, 1997, v. 90 n. 1, p. 127-139 | en_HK |
dc.identifier.issn | 0026-8976 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/70354 | - |
dc.description.abstract | 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 CF 3CH 2 radical going towards a more planar geometry about the CH 2 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. | en_HK |
dc.language | eng | en_HK |
dc.publisher | Taylor & Francis Ltd. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/00268976.asp | en_HK |
dc.relation.ispartof | Molecular Physics | en_HK |
dc.title | Femtosecond photodissociation dynamics of 1,1,1-trifluoro-2-iodoethane in the Franck-Condon region | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0026-8976&volume=90&issue=1&spage=127&epage=139&date=1997&atitle=Femtosecond+photodissociation+dynamics+of+1,1,1-trifluoro-2-iodoethane+in+the+Franck-Condon+region | en_HK |
dc.identifier.email | Phillips, DL:phillips@hku.hk | en_HK |
dc.identifier.authority | Phillips, DL=rp00770 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1080/002689797172949 | - |
dc.identifier.scopus | eid_2-s2.0-0041115186 | en_HK |
dc.identifier.hkuros | 24372 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-0041115186&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 90 | en_HK |
dc.identifier.issue | 1 | en_HK |
dc.identifier.spage | 127 | en_HK |
dc.identifier.epage | 139 | en_HK |
dc.identifier.isi | WOS:A1997WF61700015 | - |
dc.publisher.place | United Kingdom | en_HK |
dc.identifier.scopusauthorid | Kwok, WM=7103129332 | en_HK |
dc.identifier.scopusauthorid | Ng, PK=7201377071 | en_HK |
dc.identifier.scopusauthorid | He, GZ=7401955296 | en_HK |
dc.identifier.scopusauthorid | Phillips, DL=7404519365 | en_HK |
dc.identifier.issnl | 0026-8976 | - |