Imaging Isocyanic Acid Photodissociation at 193 nm: the NH(a1Δ)+CO(X1Σ+) Channel

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. Images have been accumulated for the NH(a1Δ) rotational states in the grou...

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Bibliographic Details
Published in:Chinese journal of chemical physics 2018-02, Vol.31 (1), p.27-32
Main Authors: Zhang, Zhi-guo, Xin, Min, Zhao, Shu-tao, Chen, Yang
Format: Article
Language:English
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Summary: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. 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 implies 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 dissociation process for the N−C bond cleavage. A bimodal rotational state distribution of CO(v) has been observed, this result implies that isocyanic acid dissociates in the S1 state in two different pathways.
ISSN:1674-0068
2327-2244
DOI:10.1063/1674-0068/31/cjcp1706120