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Imaging isocyanic acid Photodissociation at 193 nm: The NH (a1Δ) CO (X1Σ ) Channel
陈旸
作者单位E-mail
陈旸 中国科学技术大学 yangchen@ustc.edu.cn 
摘要:
The photodissociation dynamics of isocyanic acid (HNCO) has been studied by the time-sliced velocity map ion imaging technique at 193 nm. The NH(a1Δ) products were measured via (2 1) resonance enhanced multiphoton ionization (REMPI). Images have been accumulated for the NH(a1Δ) rotational states in the ground and vibrational excited state (v=0 and 1). The center-of-mass translational energy distribution derived from the NH(a1Δ) images imply that the CO vibrational distributions are inverted for most of the measured 1NH(v|j) internal states. The anisotropic product angular distribution observed indicates a rapid direct dissociation process for the N-C bond cleavage. A bimodal rotational distribution of CO(v) has been observed, this result implies that isocyanic acid dissociates in the S1 state in two different pathways.
关键词:  isocyanic acid, photodissociation dynamics, sliced velocity map ion imaging
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Imaging isocyanic acid Photodissociation at 193 nm: The NH (a1Δ) CO (X1Σ ) Channel
陈旸
Abstract:
The photodissociation dynamics of isocyanic acid (HNCO) has been studied by the time-sliced velocity map ion imaging technique at 193 nm. The NH(a1Δ) products were measured via (2 1) resonance enhanced multiphoton ionization (REMPI). Images have been accumulated for the NH(a1Δ) rotational states in the ground and vibrational excited state (v=0 and 1). The center-of-mass translational energy distribution derived from the NH(a1Δ) images imply that the CO vibrational distributions are inverted for most of the measured 1NH(v|j) internal states. The anisotropic product angular distribution observed indicates a rapid direct dissociation process for the N-C bond cleavage. A bimodal rotational distribution of CO(v) has been observed, this result implies that isocyanic acid dissociates in the S1 state in two different pathways.
Key words:  isocyanic acid, photodissociation dynamics, sliced velocity map ion imaging