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The simultaneous three-body dissociation of CF2I2.
- Source :
-
Journal of Chemical Physics . 7/15/1991, Vol. 95 Issue 2, p986. 12p. - Publication Year :
- 1991
-
Abstract
- The photodissociation dynamics of difluorodiiodomethane CF2I2 following 248 nm excitation were studied using the time-of-flight crossed laser-molecular beam technique. There is clear evidence that CF2I2 undergoes exclusively a simultaneous three-body dissociation. Two different reaction channels are observed: the dominant one (86%) yields CF2+I(2P1/2)+I(2P3/2) while the less efficient one (14%) produces the same fragments but in the ground state CF2+I(2P3/2)+I(2P3/2). The angle I–C–I between the recoil velocity vectors of the two departing I atoms was determined to be 120 °. The measured anisotropy parameters of βCF2=-0.8 for the CF2 fragments and βI=+1.1 for the I atoms (in both reaction channels) imply that the excited state symmetry of CF2I[ATOTHER]@B|[/ATOTHER]2 is B1 (molecular symmetry C2v) and also indicate that the excited state lifetime is significantly shorter than a rotational period. Furthermore, the dissociation energy for the rupture of both C–I bonds was determined to be D0≤53 kcal/mol. Based on this dissociation energy a heat of formation for CF2I2 of ΔH0f, 0 K=-46 kcal/mol was calculated. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHOTODISSOCIATION
*MOLECULAR beams
*CARBON
*FLUORINE
Subjects
Details
- Language :
- English
- ISSN :
- 00219606
- Volume :
- 95
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Chemical Physics
- Publication Type :
- Academic Journal
- Accession number :
- 7639512
- Full Text :
- https://doi.org/10.1063/1.461054