Imaging CH3SH photodissociation at 204 nm: the SH + CH3 channel

Chen, Zhichao; Shuai, Quan; Eppink, André T. J. B.; Jiang, Bo; Dai, Dongxu; Yang, Xueming; Parker, David H.

doi:10.1039/c1cp00032b

Cited by 13 publications

(20 citation statements)

References 36 publications

(62 reference statements)

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“…The photodissociation experiments were carried out on a time-sliced velocity map ion imaging apparatus described elsewhere [29,30]. In brief, a skimmed molecular beam containing 2% HNCO seeded in He was produced by a pulsed valve (General valve series 9) with a 0.5 mm nozzle.…”

Section: Methodsmentioning

confidence: 99%

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

Zhang

Xin

Zhao

et al. 2018

Chinese Journal of Chemical Physics

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The photodissociation dynamics of isocyanic acid (HNCO) has been studied by the timesliced velocity map ion imaging technique at 193 nm. The NH(a 1 ∆) products were measured via (2+1) resonance enhanced multiphoton ionization. Images have been accumulated for the NH(a 1 ∆) rotational states in the ground and vibrational excited state (v=0 and 1). The center-of-mass translational energy distribution derived from the NH(a 1 ∆) images implies that the CO vibrational distributions are inverted for most of the measured 1 NH(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 S 1 state in two different pathways.

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Section: Methodsmentioning

confidence: 99%

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

Zhang

Xin

Zhao

et al. 2018

Chinese Journal of Chemical Physics

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“…The inner, broad and as well anisotropic ring, corresponds to the secondary dissociation channel of the hot CH 3 S primary product into CH 3 and S fragments. The central blot is assigned to multiphoton dissociative ionization of the parent CH 3 SH 7. Angular integration of the images shown in Figure1yields the translational energy distributions (TEDs) depicted in Figure 2.…”

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confidence: 94%

Photodissociation Dynamics and Stereodynamics of Methyl Mercaptan and Dimethyl Sulfide from the Second Absorption Band at 201 and 210 nm

et al. 2019

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The role of promoting and spectator modes vs. energy randomization in nonadiabatic dynamics is interrogated in the photodissociation of methyl mercaptan, CH 3 SH, and dimethyl sulde, CH 3 SCH 3 or DMS, in the second absorption band. The primary 1 CH 3 (ν) radicals produced in the dissociation of both systems at 210 nm have been resonantly detected in slice-imaging experiments and the corresponding translational energy and angular distributions have been obtained. The stereodynamical information provided by Dixon's bipolar moments in conjunction with the energy partitioning among the dierent degrees of freedom of the primary CH 3 (ν) products oers a panoramic picture of the photodissociation process of both systems. The remarkable similitude found between the two systems related to both vector correlations and internal energy content of the corresponding counterparts − SH for methyl mercaptan and SCH 3 for DMS − indicates that despite the diabaticity of the process, no ecient energy randomization of the available energy takes place. More specically, only the parent vibrational modes whose participation in the initial absorption step is imposed by the conical intersection − i.e. the promoting modes − are adiabatically preserved during the process, while the rest of the vibrational modes play the spectator role. The results for both molecules at 210 nm are complemented with experiments carried out for DMS at 201 nm to explore the internal mechanism of the conical intersection in dierent zones of the absorption region.

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“…The ultraviolet (UV) photodissociation studies of methyl mercaptan (CH 3 SH) have received a great deal of attention in recent years [2][3][4]. The near UV electronic spectrum [5] of CH 3 SH shows two absorption bands.…”

Section: Introductionmentioning

confidence: 99%

Theoretical studies on the spectroscopic properties of methyl mercaptan (CH3SH)

Yang

2015

J Struct Chem

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The properties of the ground and low-lying excited states of methyl mercaptan (CH 3 SH) are studied by using quantum chemistry methods. The geometric parameters and energies of the ground state and the triplet excited state are calculated in this work. It is shown that the calculated geometries of the ground and triplet state are stable and the triplet state potential energy surface has the repulsive feature. The calculated vertical excitation energies and vertical ionization potentials of methyl mercaptan are in best agreement with the experimental values. In addition, the vertical electron affinity and the adiabatic electron affinity of the CH 3 SH molecule are also calculated.

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Imaging CH3SH photodissociation at 204 nm: the SH + CH3 channel

Cited by 13 publications

References 36 publications

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

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

Photodissociation Dynamics and Stereodynamics of Methyl Mercaptan and Dimethyl Sulfide from the Second Absorption Band at 201 and 210 nm

Theoretical studies on the spectroscopic properties of methyl mercaptan (CH3SH)

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