Imaging the Pair-Correlated HNCO Photodissociation: The NH(a1螖) + CO(X1危+) Channel

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• 作者：Zhiguo Zhang ; Zhichao Chen ; Cunshun Huang ; Yang Chen ; Dongxu Dai ; David H. Parker ; Xueming Yang
• 刊名：Journal of Physical Chemistry A
• 出版年：2014
• 出版时间：April 3, 2014
• 年：2014
• 卷：118
• 期：13
• 页码：2413-2418
• 全文大小：352K
• 年卷期：v.118,no.13(April 3, 2014)
• ISSN：1520-5215

文摘

The NH(a¹螖) + CO(X¹危⁺) product channel for the photodissociation of HNCO at 201 nm was investigated using the sliced velocity map ion imaging technique with the detection of NH(a¹螖) products via (2 + 1) resonance enhanced multiphoton ionization (REMPI). Images were measured for the NH(a¹螖) rotational states in the ground and vibrational excited states (v = 0 and 1). Correlation between the NH(a¹螖) and CO rovibrational state distributions were determined from these images. Experimental results show that the vibrational distribution of the CO fragment in the NH(a¹螖) + CO(X¹危⁺) channel peaks at v = 1. The negative anisotropy parameter measured for the NH(a¹螖) (v = 0 and 1|j) products indicates a direct dissociation process for the N鈥揅 bond cleavage in the S₁ state. A bimodal CO rotational distribution was observed, suggesting that HNCO dissociates in the S₁ state in two distinctive pathways.