1
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Sun Z, Farooq Z, Chen Z, Qin Z, Wei Y, Hua Z, Yang X, Xu X, Zheng X, Parker DH. Multiphoton Ionization/Dissociation of Molecular Sulfur S 2 in the UV Region. J Phys Chem A 2024; 128:4030-4037. [PMID: 38722760 DOI: 10.1021/acs.jpca.4c02134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2024]
Abstract
The multiphoton ionization/dissociation dynamics of molecular sulfur (S2) in the ultraviolet range of 205-300 nm is studied using velocity map ion imaging (VMI). In this one-color experiment, molecular sulfur (S2) is generated in a pulsed discharge and then photodissociated by UV radiation. At the three-photon level, superexcited states are accessed via two different resonant states: the B3Σu- (v' = 8-11) valence states at the one-photon level and a Rydberg state at the two-photon level. Among the decay processes of these superexcited states, dissociation to electronically excited S atoms is dominant as compared to autoionization to ionic states S2+ (X2Πg) at wavelengths λ < 288 nm. The anisotropy parameter extracted from these images reflects the parallel character of these electronic transitions. In contrast, autoionization is found to be particularly efficient at S(1D) and S(1S) detection wavelengths around 288 nm. Information obtained from the kinetic energy distributions of S atoms has revealed the existence of vibrationally excited S2+ (X2Πg (v+ > 11)) that dissociates to ionic products following one-photon absorption. This work also reveals many interesting features of S2 photodynamics compared to those of electronically analogous O2.
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Affiliation(s)
- Zhongfa Sun
- Anhui Province Key Laboratory for Control and Applications of Optoelectronic Information Materials, Department of Physics, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Zahid Farooq
- Department of Molecular and Laser Physics, Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
- Department of Physics, Division of Science and Technology, University of Education, 54770 Lahore, Pakistan
| | - Zhichao Chen
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Zhengbo Qin
- Anhui Province Key Laboratory for Control and Applications of Optoelectronic Information Materials, Department of Physics, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Yaxiong Wei
- Anhui Province Key Laboratory for Control and Applications of Optoelectronic Information Materials, Department of Physics, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Zefeng Hua
- Anhui Province Key Laboratory for Control and Applications of Optoelectronic Information Materials, Department of Physics, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Xinyan Yang
- Anhui Province Key Laboratory for Control and Applications of Optoelectronic Information Materials, Department of Physics, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Xinsheng Xu
- Anhui Province Key Laboratory for Control and Applications of Optoelectronic Information Materials, Department of Physics, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Xianfeng Zheng
- Anhui Province Key Laboratory for Control and Applications of Optoelectronic Information Materials, Department of Physics, Anhui Normal University, Wuhu, Anhui 241002, China
| | - David H Parker
- Anhui Province Key Laboratory for Control and Applications of Optoelectronic Information Materials, Department of Physics, Anhui Normal University, Wuhu, Anhui 241002, China
- Department of Molecular and Laser Physics, Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
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2
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Luo Z, Wu Y, Yang S, Li Z, Hua W, Chen Z, Che L, Wang X, Ashfold MNR, Yuan K. Unraveling the Rich Fragmentation Dynamics Associated with S-H Bond Fission Following Photoexcitation of H 2S at Wavelengths ∼129.1 nm. J Phys Chem A 2024; 128:3351-3360. [PMID: 38651288 DOI: 10.1021/acs.jpca.4c01478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
H2S is being detected in the atmospheres of ever more interstellar bodies, and photolysis is an important mechanism by which it is processed. Here, we report H Rydberg atom time-of-flight measurements following the excitation of H2S molecules to selected rotational (JKaKc') levels of the 1B1 Rydberg state associated with the strong absorption feature at wavelengths of λ ∼ 129.1 nm. Analysis of the total kinetic energy release spectra derived from these data reveals that all levels predissociate to yield H atoms in conjunction with both SH(A) and SH(X) partners and that the primary SH(A)/SH(X) product branching ratio increases steeply with ⟨Jb2⟩, the square of the rotational angular momentum about the b-inertial axis in the excited state. These products arise via competing homogeneous (vibronic) and heterogeneous (Coriolis-induced) predissociation pathways that involve coupling to dissociative potential energy surfaces (PES(s)) of, respectively, 1A″ and 1A' symmetries. The present data also show H + SH(A) product formation when exciting the JKaKc' = 000 and 111 levels, for which ⟨Jb2⟩ = 0 and Coriolis coupling to the 1A' PES(s) is symmetry forbidden, implying the operation of another, hitherto unrecognized, route to forming H + SH(A) products following excitation of H2S at energies above ∼9 eV. These data can be expected to stimulate future ab initio molecular dynamic studies that test, refine, and define the currently inferred predissociation pathways available to photoexcited H2S molecules.
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Affiliation(s)
- Zijie Luo
- Marine Engineering College, Dalian Maritime University, Liaoning 116026, China
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
| | - Yucheng Wu
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shuaikang Yang
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
- Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Jinzhai Road 96, Hefei, Anhui 230026, China
| | - Zhenxing Li
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
| | - Wei Hua
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
| | - Zhichao Chen
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
| | - Li Che
- Department of Physics, School of Science, Dalian Maritime University, Dalian 116026, China
| | - Xingan Wang
- Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Jinzhai Road 96, Hefei, Anhui 230026, China
| | | | - Kaijun Yuan
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Hefei National Laboratory, Hefei 230088, China
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3
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Qin Y, Zheng X, Song Y, Sun G, Zhang J. Predissociation dynamics of the A2Σ+ state of SH radical: Fine-structure state distributions of the S(3PJ) products. J Chem Phys 2023; 159:141103. [PMID: 37823461 DOI: 10.1063/5.0176504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 09/26/2023] [Indexed: 10/13/2023] Open
Abstract
Photo-predissociation of rovibrational levels of SH (A2Σ+, v' = 0-6) is studied using the high-n Rydberg atom time-of-flight technique. Spin-orbit branching fractions of the S(3PJ=2,1,0) products are measured in the product translational energy distributions. The SH A2Σ+v' = 0 state predissociates predominantly via coupling to the 4Σ- repulsive state. As the vibrational level v' increases, predissociation dynamics change drastically, with all three repulsive states (4Σ-, 2Σ-, and 4Π) involved in the dissociation. Nonadiabatic interactions and quantum interferences among these dissociation pathways affect the fine-structure state distributions of the S(3PJ=2,1,0) products.
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Affiliation(s)
- Yuan Qin
- Department of Chemistry, University of California at Riverside, Riverside, California 92521, USA
| | - Xianfeng Zheng
- Department of Chemistry, University of California at Riverside, Riverside, California 92521, USA
| | - Yu Song
- Department of Chemistry, University of California at Riverside, Riverside, California 92521, USA
| | - Ge Sun
- Department of Chemistry, University of California at Riverside, Riverside, California 92521, USA
| | - Jingsong Zhang
- Department of Chemistry, University of California at Riverside, Riverside, California 92521, USA
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4
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Zhao Y, Chen J, Luo Z, Chang Y, Yang J, Zhang W, Wu G, Crane SW, Hansen CS, Ding H, An F, Hu X, Xie D, Ashfold MNR, Yuan K, Yang X. The vibronic state dependent predissociation of H 2S: determination of all fragmentation processes. Chem Sci 2023; 14:2501-2517. [PMID: 36908956 PMCID: PMC9993885 DOI: 10.1039/d2sc06988a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Accepted: 02/09/2023] [Indexed: 02/16/2023] Open
Abstract
Photochemistry plays a significant role in shaping the chemical reaction network in the solar nebula and interstellar clouds. However, even in a simple triatomic molecule photodissociation, determination of all fragmentation processes is yet to be achieved. In this work, we present a comprehensive study of the photochemistry of H2S, derived from cutting-edge translational spectroscopy measurements of the H, S(1D) and S(1S) atom products formed by photolysis at wavelengths across the range 155-120 nm. The results provide detailed insights into the energy disposal in the SH(X), SH(A) and H2 co-fragments, and the atomisation routes leading to two H atoms along with S(3P) and S(1D) atoms. Theoretical calculations allow the dynamics of all fragmentation processes, especially the bimodal internal energy distributions in the diatomic products, to be rationalised in terms of non-adiabatic transitions between potential energy surfaces of both 1A' and 1A'' symmetry. The comprehensive picture of the wavelength-dependent (or vibronic state-dependent) photofragmentation behaviour of H2S will serve as a text-book example illustrating the importance of non-Born-Oppenheimer effects in molecular photochemistry, and the findings should be incorporated in future astrochemical modelling.
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Affiliation(s)
- Yarui Zhao
- School of Physics, Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Chinese Ministry of Education, Dalian University of Technology Dalian 116024 China.,State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Junjie Chen
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University Nanjing 210023 China
| | - Zijie Luo
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Yao Chang
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Jiayue Yang
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Weiqing Zhang
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Guorong Wu
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China
| | - Stuart W Crane
- School of Chemistry, University of Bristol Bristol BS8 1TS UK
| | | | - Hongbin Ding
- School of Physics, Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Chinese Ministry of Education, Dalian University of Technology Dalian 116024 China
| | - Feng An
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University Nanjing 210023 China
| | - Xixi Hu
- Kuang Yaming Honors School, Institute for Brain Sciences, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University Nanjing 210023 China .,Hefei National Laboratory Hefei 230088 China
| | - Daiqian Xie
- Institute of Theoretical and Computational Chemistry, Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University Nanjing 210023 China.,Hefei National Laboratory Hefei 230088 China
| | | | - Kaijun Yuan
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China .,Hefei National Laboratory Hefei 230088 China
| | - Xueming Yang
- State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian 116023 China .,Hefei National Laboratory Hefei 230088 China.,Department of Chemistry, Southern University of Science and Technology Shenzhen 518055 China
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5
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Dwivedi I, Sarkar A, Rajaraman G, Subramaniam C. Electric-Field-Induced Solid-Gas Interfacial Chemical Reaction in Carbon Nanotube Ensembles: Route toward Ultra-sensitive Gas Detectors. ACS APPLIED MATERIALS & INTERFACES 2022; 14:13271-13279. [PMID: 35266685 DOI: 10.1021/acsami.1c23670] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The electric field at the sharp pointed tips of single wall carbon nanotube ensembles has been utilized to kinetically accelerate hitherto unobserved chemical reactions at the heterogeneous solid-gas interfaces. The principle of ″action-of-points″ drives specific chemical reactions between the defect sites of single wall carbon nanotubes (CNTs) and ppb levels of gaseous hydrogen sulfide. This is manifested as changes in the electrical conductivity of the conductive CNT-ensemble (cCNT) and visually tracked as enthalpic modulations at the site of the reaction through infrared thermometry. Importantly, the principle has been observed for a variety of analytes such as NH3, H2O, and H2S, leading to distinctly correlatable changes in reactivity and conductivity changes. Theoretical calculations based on the density functional theory in the presence and absence of applied electric field reveal that the applied electric field activates the H2S gas molecules by charge polarization, yielding favorable energetics. These results imply the possibility of carrying out site-specific chemical modifications for nanomaterials and also provide transformative opportunities for the development of miniaturized e-nose-based gas analyzers.
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Affiliation(s)
- Itisha Dwivedi
- Department of Chemistry, Indian Institution of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India
| | - Arup Sarkar
- Department of Chemistry, Indian Institution of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institution of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India
| | - Chandramouli Subramaniam
- Department of Chemistry, Indian Institution of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India
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6
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Qin Y, Zheng X, Song Y, Sun G, Zhang J. Two-photon dissociation dynamics of the mercapto radical. Phys Chem Chem Phys 2022; 24:27232-27240. [DOI: 10.1039/d2cp04116b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
After sequential two-photon excitation via the A2Σ+ (v' = 0) state, the SH/SD radicals promptly dissociate on the repulsive 22Π and B2Σ+ PECs along with some non-adiabatic crossings, leading to the H/D + S(1D) and H/D + S(1S) products, respectively.
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Affiliation(s)
- Yuan Qin
- Department of Chemistry, University of California at Riverside, Riverside, California, 92521, USA
| | - Xianfeng Zheng
- Department of Chemistry, University of California at Riverside, Riverside, California, 92521, USA
| | - Yu Song
- Department of Chemistry, University of California at Riverside, Riverside, California, 92521, USA
| | - Ge Sun
- Department of Chemistry, University of California at Riverside, Riverside, California, 92521, USA
| | - Jingsong Zhang
- Department of Chemistry, University of California at Riverside, Riverside, California, 92521, USA
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7
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Rotational and nuclear-spin level dependent photodissociation dynamics of H 2S. Nat Commun 2021; 12:4459. [PMID: 34294710 PMCID: PMC8298612 DOI: 10.1038/s41467-021-24782-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 07/05/2021] [Indexed: 12/02/2022] Open
Abstract
The detailed features of molecular photochemistry are key to understanding chemical processes enabled by non-adiabatic transitions between potential energy surfaces. But even in a small molecule like hydrogen sulphide (H2S), the influence of non-adiabatic transitions is not yet well understood. Here we report high resolution translational spectroscopy measurements of the H and S(1D) photoproducts formed following excitation of H2S to selected quantum levels of a Rydberg state with 1B1 electronic symmetry at wavelengths λ ~ 139.1 nm, revealing rich photofragmentation dynamics. Analysis reveals formation of SH(X), SH(A), S(3P) and H2 co-fragments, and in the diatomic products, inverted internal state population distributions. These nuclear dynamics are rationalised in terms of vibronic and rotational dependent predissociations, with relative probabilities depending on the parent quantum level. The study suggests likely formation routes for the S atoms attributed to solar photolysis of H2S in the coma of comets like C/1995 O1 and C/2014 Q2. The photodissociation dynamics of small molecules in the vacuum ultraviolet range can have key implications for astrochemical modelling, but revealing such dynamical details is a challenging task. Here the authors, combining high resolution experimental techniques, provide a detailed description of the fragmentation dynamics of selected rotational levels of a predissociated Rydberg state of H2S.
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8
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Gao H. Molecular photodissociation in the vacuum ultraviolet region: implications for astrochemistry and planetary atmospheric chemistry. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1861354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Hong Gao
- Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing, People’s Republic of China
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9
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Ultraviolet photolysis of H 2S and its implications for SH radical production in the interstellar medium. Nat Commun 2020; 11:1547. [PMID: 32210241 PMCID: PMC7093389 DOI: 10.1038/s41467-020-15343-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Accepted: 03/05/2020] [Indexed: 11/27/2022] Open
Abstract
Hydrogen sulfide radicals in the ground state, SH(X), and hydrogen disulfide molecules, H2S, are both detected in the interstellar medium, but the returned SH(X)/H2S abundance ratios imply a depletion of the former relative to that predicted by current models (which assume that photon absorption by H2S at energies below the ionization limit results in H + SH photoproducts). Here we report that translational spectroscopy measurements of the H atoms and S(1D) atoms formed by photolysis of jet-cooled H2S molecules at many wavelengths in the range 122 ≤ λ ≤155 nm offer a rationale for this apparent depletion; the quantum yield for forming SH(X) products, Γ, decreases from unity (at the longest excitation wavelengths) to zero at short wavelengths. Convoluting the wavelength dependences of Γ, the H2S parent absorption and the interstellar radiation field implies that only ~26% of photoexcitation events result in SH(X) products. The findings suggest a need to revise the relevant astrochemical models. Sulfur is abundant in the Universe, but the observed abundance ratio of SH to H2S doesn’t agree with astrochemical models. The authors measure product state-resolved translational energy spectra of photoproducts in a jet-cooled H2S beam as a function of wavelength, showing that SH yield is lower than assumed in the models.
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10
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Sun ZF, Farooq Z, Parker DH, Martin PJJ, Western CM. Photodissociation of S 2 (X 3Σ g-, a 1Δ g, and b 1Σ g+) in the 320-205 nm Region. J Phys Chem A 2019; 123:6886-6896. [PMID: 31322887 PMCID: PMC6699204 DOI: 10.1021/acs.jpca.9b05350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
Photodissociation
of vibrationally and electronically excited sulfur
dimer molecules (S2) has been studied in a combined experimental
and computational quantum chemistry study in order to characterize
bound-continuum transitions. Ab initio quantum chemistry calculations
are carried out to predict the potential energy curves, spin–orbit
coupling, transition moments, and bound-continuum spectra of S2 for comparison with the experimental data. The experiment
uses velocity map imaging to measure S-atom production following S2 photoexcitation in the ultraviolet region (320–205
nm). A pulsed electric discharge in H2S produces ground-state
S2 X3Σg–(v = 0–15) as well as electronically excited singlet
sulfur and b1Σg+(v = 0, 1), and evidence is presented for the production and photodissociation
of S2 a1Δg. In a previous paper,
we reported threshold photodissociation of S2X3Σg–(v = 0) in
the 282–266 nm region. In the present study, S(3PJ) fine structure branching and angular
distributions for photodissociation of S2 (X3Σg–(v = 0), a1Δg and b1Σg+) via the B″3Πu, B3Σu– and 11Πu excited states are reported. In addition, photodissociation
of the X3Σg–(v = 0) state of S2 to the second dissociation
limit producing S(3P2) + S(1D) is
characterized. The present results on S2 photodynamics
are compared to those of the well-studied electronically isovalent
O2 molecule.
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Affiliation(s)
- Z F Sun
- Institute for Molecules and Materials , Radboud University Nijmegen , Heyendaalseweg 135 , 6525 AJ Nijmegen , The Netherlands
| | - Z Farooq
- Institute for Molecules and Materials , Radboud University Nijmegen , Heyendaalseweg 135 , 6525 AJ Nijmegen , The Netherlands
| | - D H Parker
- Institute for Molecules and Materials , Radboud University Nijmegen , Heyendaalseweg 135 , 6525 AJ Nijmegen , The Netherlands
| | - P J J Martin
- School of Chemistry , University of Bristol , Cantock's Close , BS8 1TS Bristol , U.K
| | - C M Western
- School of Chemistry , University of Bristol , Cantock's Close , BS8 1TS Bristol , U.K
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11
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Hrodmarsson HR, Garcia GA, Nahon L, Loison JC, Gans B. The absolute photoionization cross section of the mercapto radical (SH) from threshold up to 15.0 eV. Phys Chem Chem Phys 2019; 21:25907-25915. [DOI: 10.1039/c9cp05809e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present the absolute photoionization cross-section of the mercapto radical, SH, recorded from its first ionization energy at 10.4 eV up to a photon energy of 15 eV.
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Affiliation(s)
| | | | - Laurent Nahon
- Synchrotron SOLEIL
- L’Orme des Merisiers
- Gif sur Yvette
- France
| | | | - Bérenger Gans
- Institut des Sciences Moléculaires d’Orsay (ISMO)
- UMR 8214 CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- F-91405 Orsay Cedex
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12
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Kashinski DO, Talbi D, Hickman AP, Di Nallo OE, Colboc F, Chakrabarti K, Schneider IF, Mezei JZ. A theoretical study of the dissociative recombination of SH + with electrons through the 2Π states of SH. J Chem Phys 2017; 146:204109. [PMID: 28571387 PMCID: PMC5449277 DOI: 10.1063/1.4983690] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 05/05/2017] [Indexed: 11/15/2022] Open
Abstract
A quantitative theoretical study of the dissociative recombination of SH+ with electrons has been carried out. Multireference, configuration interaction calculations were used to determine accurate potential energy curves for SH+ and SH. The block diagonalization method was used to disentangle strongly interacting SH valence and Rydberg states and to construct a diabatic Hamiltonian whose diagonal matrix elements provide the diabatic potential energy curves. The off-diagonal elements are related to the electronic valence-Rydberg couplings. Cross sections and rate coefficients for the dissociative recombination reaction were calculated with a stepwise version of the multichannel quantum defect theory, using the molecular data provided by the block diagonalization method. The calculated rates are compared with the most recent measurements performed on the ion Test Storage Ring (TSR) in Heidelberg, Germany.
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Affiliation(s)
- D O Kashinski
- Department of Physics and Nuclear Engineering, United States Military Academy, West Point, New York 10996, USA
| | - D Talbi
- Laboratoire Univers et Particules de Montpellier, Université de Montpellier, CNRS, Place Eugène Bataillon, 34095 Montpellier, France
| | - A P Hickman
- Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, Pennsylvania 18015, USA
| | - O E Di Nallo
- Department of Physics and Nuclear Engineering, United States Military Academy, West Point, New York 10996, USA
| | - F Colboc
- Laboratoire Ondes et Milieux Complexes, UMR 6294, Université Le Havre, 25, Rue Philippe Lebon, BP 540, F-76058 Le Havre, France
| | - K Chakrabarti
- Department of Mathematics, Scottish Church College, 1 and 3 Urquhart Square, Calcutta 700 006, India
| | - I F Schneider
- Laboratoire Ondes et Milieux Complexes, UMR 6294, Université Le Havre, 25, Rue Philippe Lebon, BP 540, F-76058 Le Havre, France
| | - J Zs Mezei
- Laboratoire Ondes et Milieux Complexes, UMR 6294, Université Le Havre, 25, Rue Philippe Lebon, BP 540, F-76058 Le Havre, France
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13
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Toulson BW, Murray C. Decomposing the First Absorption Band of OCS Using Photofragment Excitation Spectroscopy. J Phys Chem A 2016; 120:6745-52. [PMID: 27552402 DOI: 10.1021/acs.jpca.6b06060] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Photofragment excitation spectra of carbonyl sulfide (OCS) have been recorded from 212-260 nm by state-selectively probing either electronically excited S((1)D) or ground state S((3)P) photolysis products via 2 + 1 resonance-enhanced multiphoton ionization. Probing the major S((1)D) product results in a broad, unstructured action spectrum that reproduces the overall shape of the first absorption band. In contrast, spectra obtained probing S((3)P) products display prominent resonances superimposed on a broad continuum; the resonances correspond to the diffuse vibrational structure observed in the conventional absorption spectrum. The vibrational structure is assigned to four progressions, each dominated by the C-S stretch, ν1, following direct excitation to quasi-bound singlet and triplet states. The S((3)PJ) products are formed with a near-statistical population distribution over the J = 2, 1, and 0 spin-orbit levels across the wavelength range investigated. Although a minor contributor to the S atom yield near the peak of the absorption cross section, the relative yield of S((3)P) increases significantly at longer wavelengths. The experimental measurements validate recent theoretical work characterizing the electronic states responsible for the first absorption band by Schmidt and co-workers.
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Affiliation(s)
- Benjamin W Toulson
- Department of Chemistry, University of California, Irvine , Irvine, California 92697, United States
| | - Craig Murray
- Department of Chemistry, University of California, Irvine , Irvine, California 92697, United States
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Tsai PY, Lin KC. Rotational Energy Transfer of SH(X2Π, v′′=0, J′′=0.5-10.5) by Collision with Ar: Λ-Doublet Resolved Transition Propensity. Chemphyschem 2012; 13:274-80. [DOI: 10.1002/cphc.201100604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Revised: 09/09/2011] [Indexed: 11/11/2022]
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15
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Tsai PY, Lin KC. Doublet rotational energy transfer of the SH (X 2Π, v′′ = 0) state by collisions with Ar. Phys Chem Chem Phys 2011; 13:8857-68. [DOI: 10.1039/c0cp01882a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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16
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Greaves SJ, Rose RA, Orr-Ewing AJ. Velocity map imaging of the dynamics of bimolecular chemical reactions. Phys Chem Chem Phys 2010; 12:9129-43. [PMID: 20448868 DOI: 10.1039/c001233e] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The experimental technique of velocity map imaging (VMI) enables measurements to be made of the dynamics of chemical reactions that are providing unprecedented insights about reactive scattering. This perspective article illustrates how VMI, in combination with crossed-molecular beam, dual-beam or photo-initiated (Photoloc) methods, can reveal correlated information on the vibrational quantum states populated in the two products of a reaction, and the angular scattering of products (the differential cross section) formed in specific rotational and vibrational levels. Reactions studied by VMI techniques are being extended to those of polyatomic molecules or radicals, and of molecular ions. Subtle quantum-mechanical effects in bimolecular reactions can provide distinct signatures in the velocity map images, and are exemplified here by non-adiabatic dynamics on coupled potential energy surfaces, and by experimental evidence for scattering resonances.
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Affiliation(s)
- Stuart J Greaves
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK
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17
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Tsai PY, Lin KC. Fine structure-resolved rotational energy transfer of SH (A 2Σ +, v′ = 0) state by collisions with Ar. Phys Chem Chem Phys 2010; 12:1162-71. [DOI: 10.1039/b920614k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Chichinin AI, Gericke KH, Kauczok S, Maul C. Imaging chemical reactions – 3D velocity mapping. INT REV PHYS CHEM 2009. [DOI: 10.1080/01442350903235045] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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19
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Frederix PWJM, Yang CH, Groenenboom GC, Parker DH, Alnama K, Western CM, Orr-Ewing AJ. Photodissociation Imaging of Diatomic Sulfur (S2). J Phys Chem A 2009; 113:14995-5005. [DOI: 10.1021/jp905104u] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | - Koutayba Alnama
- Laboratoire de Photophysique Moléculaire, Université de Paris-Sud, 91405 ORSAY CEDEX, France
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20
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Kuznetsov VV, Shternin PS, Vasyutinskii OS. The role of the Coriolis interaction on vector correlations in molecular predissociation: Excitation of isolated rotational lines. J Chem Phys 2009; 130:134312. [DOI: 10.1063/1.3106402] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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Radenović DČ, van Roij AJA, Wu SM, ter Meulen JJ, Parker DH, van der Loo MPJ, Groenenboom GC. Predissociation of the A2Σ+ (v′ = 3) state of the OH radical. Phys Chem Chem Phys 2009; 11:4754-60. [DOI: 10.1039/b900249a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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