Source:http://linkedlifedata.com/resource/pubmed/id/19026057
Switch to
| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
19
|
| pubmed:dateCreated |
2008-11-25
|
| pubmed:abstractText |
We investigated the photodissociation dynamics of methyl formate-d (CH(3)OC(O)D) at 193.3 nm in a molecular-beam apparatus using undulator radiation as an ionization source. We measured kinetic-energy distributions, spatial angular anisotropies, and branching ratios of all photofragments. Fractions of energy release into product translation were calculated from the kinetic-energy distributions. Four primary dissociation pathways to asymptotes CH(3)O(X (2)E)+DCO(X (2)A(')), CH(3)O(X (2)E)+DCO(A (2)A(")), CH(3)OCO(X (2)A('))+D((2)S), and CH(3)OD(X (1)A('))+CO(X (1)Sigma(+)) were identified; their branching ratios were determined to be 0.73, 0.06, 0.13, and 0.08, respectively. The former two dissociation paths were discernible in the time-of-flight spectra of fragment CH(3)O with a signal at m/z=29. Nominal products DCO (A (2)A(")) and CH(3)OCO (X (2)A(')) were unobservable as DCO in state A dissociated to D((2)S)+CO(X (1)Sigma(+)) and internally hot CH(3)OCO (X (2)A(')) decomposed to CH(3)(X (2)A(2) ("))+CO(2)(X (1)A(1g)). Products DCO and CH(3)O have angular anisotropy parameter beta approximately -0.37 but other products have nearly isotropic angular distributions with /beta/<0.1. Nonadiabatic transitions might play an important role in fragmentation of methyl formate irradiated at 193.3 nm.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:status |
PubMed-not-MEDLINE
|
| pubmed:month |
Nov
|
| pubmed:issn |
1089-7690
|
| pubmed:author | |
| pubmed:issnType |
Electronic
|
| pubmed:day |
21
|
| pubmed:volume |
129
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
194304
|
| pubmed:year |
2008
|
| pubmed:articleTitle |
Photodissociation dynamics of methyl formate at 193.3 nm: Branching ratios, kinetic-energy distributions, and angular anisotropies of products.
|
| pubmed:affiliation |
National Synchrotron Radiation Research Center (NSRRC), 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan. shlee@nsrrc.org.tw
|
| pubmed:publicationType |
Journal Article
|