Photodissociation dynamics of OCS near 214 nm using ion imaging

Wei, Wei; Wallace, Colin J.; McBane, George C.; North, Simon W.

doi:10.1063/1.4955189

Cited by 24 publications

(20 citation statements)

References 52 publications

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“…The tendency of the observed bimodal rotational distribution is consistent with the complete trajectory surface hopping calculation by Wei et al [12] that the bimodal rotational distribution merged together and higher rotational will be distributed with increasing excitation energy. The higher rotational excitation of cofragment CO indicates that the excited parent molecule has a larger torque at this wavelength, which has been proven by Schmidt et al [14] using the reconstructed potential energy surfaces.…”

Section: B Photoexcitation and Photodissociation Mechanismssupporting

confidence: 89%

Photodissociation Dynamics of OCS at 217 nm

Bai

Liang

Zhou

et al. 2017

Chinese Journal of Chemical Physics

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The S(1 D 2)+CO(X 1 Σ +) product channel from photodissociation of OCS at 217 nm has been measured using the DC slice velocity map imaging (VMI) technique in combination with resonance enhanced multiphoton ionization (REMPI). Two different REMPI intermediate states (1 F 3 and 1 P 1) and several pump-probe laser polarization geometries are used to detect the angular momentum polarization of the photofragmented S(1 D 2). The molecularframe polarization parameters, as well as the laboratory-frame anisotropy parameters, for individual rotational states of co-fragment CO, are determined using two different full quantum theories. The measured total kinetic energy release spectrum from photodissociation of OCS indicates two dissociation channels, corresponding to the fast and slow recoiling velocities of S(1 D 2), respectively. The slow channel is concluded to originate from an initial photoexcitation to the A(1 A ′) state, followed by a non-adiabatic transition to the ground state. The fast channel is found to follow a coherent excitation to A(1 A ′) and B(1 A ′′) states, where contributions of the two states are almost equal at 217 nm. The determined alignment and anisotropy parameters further indicate that the slow channel follows an incoherent excitation, while the fast channel follows a coherent excitation to A(1 A ′) and B(1 A ′′) states with a phase difference of π/2.

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Section: B Photoexcitation and Photodissociation Mechanismssupporting

confidence: 89%

Photodissociation Dynamics of OCS at 217 nm

Bai

Liang

Zhou

et al. 2017

Chinese Journal of Chemical Physics

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“…This significantly simplifies the understanding of the dissociation dynamics and allows for the use of a reduced dimensionality model. 29 The photodissociation dynamics of OCS in its first absorption band has been extensively studied, both experimentally [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] and theoretically. 29,[47][48][49][50][51] Also the atmospheric relevance of OCS and its photodissociation as a sulphur source are of ongoing interest.…”

Section: Introductionmentioning

confidence: 99%

“…This includes laser-induced fluorescence (LIF) spectroscopy 27,31,56 and REMPI. 28,29,[32][33][34][36][37][38][39][40][41][42][43][44][45][46][57][58][59] These experiments, coupled to computational investigations, [47][48][49][50]60 have provided a wealth of detailed information on the photodissociation products, including their final state distributions. However, to date no…”

Section: Introductionmentioning

confidence: 99%

Time-resolving the UV-initiated photodissociation dynamics of OCS

et al. 2021

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“…This is easily achieved by modifying a conventional DC slice imaging spectrometer, adding two additional electrodes. The PEISI method and the simulations used to optimize and characterize it are described in the following section, before experimental verification on the well-studied system of the UV photodissociation of OCS [35,[42][43][44][45][46][47][48][49][50][51][52][53][54][55], imaging the CO + and S + ions resulting from photodissociation and subsequent resonance-enhanced multiphoton ionization (REMPI) at around 230 nm. Detailed analysis extracting a photofragment angular distribution directly from the recorded three-dimensional data by expansion in spherical harmonics is then presented, highlighting potential applications of this experimental approach.…”

Section: Introductionmentioning

confidence: 99%

Post extraction inversion slice imaging for 3D velocity map imaging experiments

et al. 2020

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An experimental configuration for velocity map ion imaging experiments is presented, in which a pulsed voltage defocusses the ion Newton sphere along the timeof-flight axis. This significantly spreads the times-of-flight for ions with the same mass-to-charge ratio, allowing for either sliced or three-dimensional velocity imaging with high slicing resolution along the time-of-flight axis. The technique is coupled to an event-triggered, position-sensitive sensor, enabling full three-dimensional Newton sphere imaging at high count rates, with significantly improved slicing resolution (∼1-2%) compared to previous DC slicing approaches. Furthermore, good slice imaging conditions can be brought about at relatively high extraction voltages, circumventing issues regarding image size, the effect of stray fields, and poor detection efficiency when operating at low extraction voltages. The method, termed Post Extraction Inversion Slice Imaging (PEISI) was designed and optimized through ion trajectory simulations and experimentally verified on the well-studied photodissociation of OCS at around 230 nm. We demonstrate that this approach is suitable for recording full 3D angular distributions of systems lacking an axis of cylindrical symmetry in the detector plane, for which conventional image inversion techniques are not valid. We believe this method could be useful in a range of studies of systems lacking cylindrical symmetry, including studies into angular momentum polarization and bimolecular scattering.

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Photodissociation dynamics of OCS near 214 nm using ion imaging

Cited by 24 publications

References 52 publications

Photodissociation Dynamics of OCS at 217 nm

Photodissociation Dynamics of OCS at 217 nm

Time-resolving the UV-initiated photodissociation dynamics of OCS

Post extraction inversion slice imaging for 3D velocity map imaging experiments

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