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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Dynamics of Br formation from the primary and secondary C?Br bond dissociation of oxalyl bromide near 234 and 265 nm

2012년 2월 16일 15시 04분 51초
PHYS.P-449 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
Paul Dababrata, 김현국1, 이경석2, 김태규1
부산대학교 화학과, Bangladesh
1부산대학교 화학과, Korea
2한국표준과학연구원 분석화학표준센터, Korea
The photodissociation dynamics of Oxalyl bromide have been investigated near 234 and 265 nm using a velocity map ion imaging technique coupled with a state selective [2+1] resonance-enhanced multiphoton ionization [REMPI] scheme. The nascent Br (2Pj, j = 1/2, 3/2) atoms stem from the primary C?Br bond fission of parent molecule as well as secondary dissociation of C2O2Br radicals which are energized from the ultrafast primary C?Br bond rupture at both pump energy. To obtain the detail dynamics, the translational energy distribution and recoil anisotropy of Br(2P3/2) and Br*(2P1/2) atom formation process are extracted from the two dimensional ion images. A single Gaussian-shaped translational energy distributions have been observed for the Br*(2p1/2) formation channel at both wavelengths. The average translational energies of this distribution are 74.65 and 49.78 KJ/mol at 234 and 265 nm, respectively. On the other hand, single Boltzmann and two Gaussian functions at 265 nm and single Boltzmann and three Gaussian function at 234 nm give the best fit for the translational energy distribution profile of Br formation. An additional Gaussian-shaped translational energy distribution is attributed from the secondary C?Br bond cleavage of the C2O2Br radical, which is energetically sufficient at higher energy (234 nm). The average translational energy of this component is 35.28 KJ/mol. The recoil anisotropy parameter, β, value of high velocity components are determined to be 0.79(0.73) and 1.11 (1.38) for Br and Br*, respectively, at 234(265) nm. The assigned translational energy distributions of each component have also been confirmed by the measured individual recoil anisotropy parameters. The relative quantum yields of each component are also measured.