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Wang Y, Zhao Y, Luo C, Zhang N, Wang W, Hu L, Yuan D, Wang X. High-Resolution Imaging Study on Photodissociation of OCS + [A 2Π Ω=1/2,3/2 (ν 1 0 ν 3)]. J Phys Chem A 2024; 128:4765-4774. [PMID: 38840312 DOI: 10.1021/acs.jpca.4c01358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
The development of the velocity map ion imaging (VMI) technique has greatly advanced the study of photodissociation dynamics. The high-resolution imaging study of the photodissociation allows for the acquisition of precise and detailed information on the fragments. This information can further provide more insight into the energy partition and potential pathways involved in the photodissociation process. In this study, we report the investigation on the photodissociation of OCS+ via the A2ΠΩ=1/2,3/2 states following the excitation of A2Π (ν1 0 ν3) ← X2Π (0 0 0) by using time-sliced VMI techniques in the ultraviolet region. Our investigation revealed significant mode-dependent recoil anisotropies and branching ratios of two product channels for both Ω = 1/2 and Ω = 3/2. The photolysis products also exhibited dramatic deviation in angular distributions and generally comparable kinetic energy distributions following the excitation to the same vibrational modes of A2ΠΩ states with two separate spin-orbit components. According to the observation in this study and previously reported photodissociation mechanisms of the OCS+ cations, the decay from the A2Π3/2 state was more likely via the internal conversion to high rovibrational states of the X2Π state, in comparison to the A2Π1/2 state.
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Affiliation(s)
- Yaling Wang
- Hefei National Research Center for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Yunfan Zhao
- Hefei National Research Center for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Chang Luo
- Hefei National Research Center for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Ning Zhang
- Hefei National Research Center for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Wenxin Wang
- Hefei National Research Center for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Liru Hu
- Hefei National Research Center for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Daofu Yuan
- Hefei National Research Center for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Xingan Wang
- Hefei National Research Center for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
- Hefei National Laboratory, Hefei 230088, China
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2
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Wang Y, Zhao Y, Zhang N, Wang W, Hu L, Luo C, Yuan D, Zhou X, Parker DH, Yang X, Wang X. Vibrational state-specific nonadiabatic photodissociation dynamics of OCS+ via A2Π1/2 (ν1 0 ν3) states. J Chem Phys 2024; 160:084301. [PMID: 38385514 DOI: 10.1063/5.0191893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Accepted: 01/29/2024] [Indexed: 02/23/2024] Open
Abstract
The identification and analysis of quantum state-specific effects can significantly deepen our understanding of detailed photodissociation dynamics. Here, we report an experimental investigation on the vibrational state-mediated photodissociation of the OCS+ cation via the A2Π1/2 (ν1 0 ν3) states by using the velocity map ion imaging technique over the photolysis wavelength range of 263-294 nm. It was found that the electronically excited S+ product channel S+(2Du) + CO (X1Σ+) was significantly enhanced when the ν1 and ν3 vibrational modes were excited. Clear deviations in the branching ratios of the electronically excited S+ channel were observed when the vibrational modes ν1 and ν3 were selectively excited. The results reveal that vibrationally excited states play a vital role in influencing the nonadiabatic couplings in the photodissociation process.
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Affiliation(s)
- Yaling Wang
- Hefei National Research Center for Physical Science at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Yunfan Zhao
- Hefei National Research Center for Physical Science at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Ning Zhang
- Hefei National Research Center for Physical Science at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Wenxin Wang
- Hefei National Research Center for Physical Science at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Liru Hu
- Hefei National Research Center for Physical Science at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Chang Luo
- Hefei National Research Center for Physical Science at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Daofu Yuan
- Hefei National Research Center for Physical Science at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Xiaoguo Zhou
- Hefei National Research Center for Physical Science at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - David H Parker
- Department of Molecular and Laser Physics, Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Xueming Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- Department of Chemistry, School of Science, Southern University of Science and Technology, Shenzhen 518055, China
- Hefei National Laboratory, Hefei 230088, China
| | - Xingan Wang
- Hefei National Research Center for Physical Science at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
- Hefei National Laboratory, Hefei 230088, China
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3
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Holland D, Shaw D. A study of the valence shell absolute photoabsorption, photoionisation and photodissociation cross sections and the photoionisation quantum efficiency of carbonyl sulphide. Chem Phys 2016. [DOI: 10.1016/j.chemphys.2016.10.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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4
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Dai Z, Sun W, Wang J, Mo Y. The Renner-Teller effect in HCCCN(+)(X̃(2)Π) studied by zero-kinetic energy photoelectron spectroscopy and theoretical calculations. J Chem Phys 2015; 143:054301. [PMID: 26254647 DOI: 10.1063/1.4927005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The spin-vibronic energy levels of the cyanoacetylene cation have been measured using the one-photon zero-kinetic energy (ZEKE) photoelectron spectroscopic method. All three degenerate vibrational modes showing vibronic coupling, i.e., Renner-Teller (RT) effect, have been observed. All the splitting spin-vibronic energy levels of the fundamental H-C≡C bending vibration (v5) have been determined. The spin-vibronic energy levels of the degenerate vibrational modes have also been calculated using a diabatic model in which the harmonic terms as well as all the second-order vibronic coupling terms are used. The theoretical predictions are in good agreement with the experimental data and are used to assign the ZEKE spectrum. It is found that the RT effects for the H-(CC)-CN bending (v7) and the C-C≡N bending (v6) vibrations are weak, whereas they are strong for the H-C≡C bending (v5) vibration. The cross-mode RT couplings between any of the two degenerate vibrations are strong. The spin-orbit resolved fundamental vibrational energy levels of the C≡N stretching (v2) and C-H stretching (v1) vibrations have also been observed. The spin-orbit energy splitting of the ground state has been determined for the first time as 43 ± 2 cm(-1), and the ionization energy of HCCCN is found to be 93 903.5 ± 2 cm(-1).
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Affiliation(s)
- Zuyang Dai
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| | - Wei Sun
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| | - Jia Wang
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| | - Yuxiang Mo
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
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5
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Sun W, Dai Z, Wang J, Mo Y. The Renner-Teller effect in HCCCl(+)(X̃(2)Π) studied by zero-kinetic energy photoelectron spectroscopy and ab initio calculations. J Chem Phys 2015; 142:194304. [PMID: 26001458 DOI: 10.1063/1.4919953] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The spin-vibronic energy levels of the chloroacetylene cation up to 4000 cm(-1) above the ground state have been measured using the one-photon zero-kinetic energy photoelectron spectroscopic method. The spin-vibronic energy levels have also been calculated using a diabatic model, in which the potential energy surfaces are expressed by expansions of internal coordinates, and the Hamiltonian matrix equation is solved using a variational method with harmonic basis functions. The calculated spin-vibronic energy levels are in good agreement with the experimental data. The Renner-Teller (RT) parameters describing the vibronic coupling for the H-C≡C bending mode (ε4), Cl-C≡C bending mode (ε5), the cross-mode vibronic coupling (ε45) of the two bending vibrations, and their vibrational frequencies (ω4 and ω5) have also been determined using an effective Hamiltonian matrix treatment. In comparison with the spin-orbit interaction, the RT effect in the H-C≡C bending (ε4) mode is strong, while the RT effect in the Cl-C≡C bending mode is weak. There is a strong cross-mode vibronic coupling of the two bending vibrations, which may be due to a vibronic resonance between the two bending vibrations. The spin-orbit energy splitting of the ground state has been determined for the first time and is found to be 209 ± 2 cm(-1).
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Affiliation(s)
- Wei Sun
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| | - Zuyang Dai
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| | - Jia Wang
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| | - Yuxiang Mo
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
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6
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Zhou D, Zhang L, Chen L, Wu D. Photodissociation Spectra of OCS + via B2Σ +↙X2Π Transitions. CHINESE J CHEM PHYS 2013. [DOI: 10.1063/1674-0068/26/03/265-269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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7
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Brites V, Mitrushchenkov AO, Léonard C. Study of the X̃2Π state of the SiCN/SiNC Renner-Teller system. J Chem Phys 2013; 138:104311. [PMID: 23514493 DOI: 10.1063/1.4794050] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The potential energy surfaces of both components of the X̃(2)Π electronic ground state of the double Renner-Teller SiCN/SiNC system are calculated using explicitly correlated coupled cluster approach. The SiNC minimum is found to lie at 628 cm(-1) above the SiCN one. The isomerization transition state is found at 7583 cm(-1) on the (2)A' surface and at 7936 cm(-1) on the (2)A(") surface. The cyclic local minimum on surface (2)A' is also reproduced by our potential energy surface and is located at 3901 cm(-1). The calculated potentials are used to simulate rovibrational spectroscopy employing the recently developed EVEREST variational code. It is shown that Renner-Teller interaction (ε = 0.3043 for SiCN and ε = 0.3874 for SiNC) and spin-orbit coupling are both very important for a correct description of the spectroscopy of this system. Comparison with available experimental measurement is reported.
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Affiliation(s)
- Vincent Brites
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
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8
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Jutier L, Léonard C. New Variational Method for the Ab Initio Study in Valence Coordinates of the Renner−Teller Effect in Tetra-Atomic Systems. J Chem Theory Comput 2010; 6:1565-79. [DOI: 10.1021/ct100071d] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Laurent Jutier
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
| | - Céline Léonard
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
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9
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Das A, Poliakoff ED, Lucchese RR, Bozek JD. Mode-specific photoionization dynamics of a simple asymmetric target: OCS. J Chem Phys 2009; 130:044302. [DOI: 10.1063/1.3062806] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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10
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11
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Pavel Rosmus. Mol Phys 2007. [DOI: 10.1080/00268970701532807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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12
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Wheeler SE, Simmonett AC, Schaefer HF. Renner−Teller Bending Frequencies of the à 2Π State of OCS+. J Phys Chem A 2007; 111:4551-5. [PMID: 17444622 DOI: 10.1021/jp0712046] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
There are inconsistencies among previously reported Renner-Teller bending frequencies for the approximately A 2Pi state of OCS+. To resolve these controversies, we have computed vibrational frequencies using high-level excited electronic state ab initio equation-of-motion coupled cluster methods. On the basis of equation-of-motion coupled cluster theory including single, double, and iterative inclusion of partial triple excitations (EOM-CC3) paired with the correlation-consistent polarized valence quadruple-zeta basis set (cc-pVQZ), we predict harmonic bending frequencies of 364 and 401 cm-1 for the A' and A" components of approximately A 2Pi OCS+, respectively. Particularly for the upper Renner-Teller component, these results are lower than the theoretical predictions of 370 and 459 cm-1 reported by Chen, Hochlaf, Rosmus, He, and Ng [J. Chem. Phys. 2002, 116, 5612]. Instead, the presently computed bending frequencies are more consistent with the experimentally derived average value of 357 +/- 5 cm-1 recently reported by Sommavilla and Merkt [J. Phys. Chem. A 2004, 108, 9970], lending credence to the spectral assignments made in this later work. The two components of the Renner-Teller bending frequencies of approximately X 2Pi OCS+ are similarly predicted to be 396 and 453 cm-1. Anharmonicity constants arising from a quartic force field computed at the cc-pVQZ EOM-CC3 level of theory are given, to provide a more complete characterization of the potential energy surface of the approximately A 2Pi state of OCS+.
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Affiliation(s)
- Steven E Wheeler
- Center for Computational Chemistry, University of Georgia, Athens, GA 30602, USA
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13
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Chen BZ, Chang HB, Huang MB. Dissociation of the OCS+ ion in low-lying electronic states studied using multiconfiguration second-order perturbation theory. J Chem Phys 2006; 125:054310. [PMID: 16942216 DOI: 10.1063/1.2222357] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Complete active space self-consistent-field (CASSCF) and multiconfiguration second-order perturbation theory (CASPT2) calculations with atomic natural orbital basis sets were performed to investigate the S-loss direct dissociation of the 1 2Pi(X 2Pi), 2 2Pi(A 2Pi), 1 2Sigma+(B 2Sigma+), 1 4Sigma-, 1 2Sigma-, and 1 2Delta states of the OCS+ ion and the predissociations of the 1 2Pi, 2 2Pi, and 1 2Sigma+ states. Our calculations indicate that the S-loss dissociation products of the OCS(+) ion in the six states are the ground-state CO molecule plus the S+ ion in different electronic states. The CASPT2//CASSCF potential energy curves were calculated for the S-loss dissociation from the six states. The calculations indicate that the dissociation of the 1 4Sigma- state leads to the CO + S+ (4Su) products representing the first dissociation limit; the dissociations of the 1 2Pi, 1 2Sigma-, and 1 2Delta states lead to the CO + S+(2Du) products representing the second dissociation limit; and the dissociations of the 2 2Pi and 1 2Sigma+ states lead to the CO + S+(2Pu) products representing the third dissociation limit. Seams of the 1 2Pi-1 4Sigma-, 2 2Pi-1 4Sigma-, 2 2Pi-1 2Sigma-, 2 2Pi-1 2Delta, and 1 2Sigma(+)-1 4Sigma- potential energy surface intersections were calculated at the CASPT2 level, and the minima along the seams were located. The calculations indicate that within the experimental energy range (15.07-16.0 eV) the 2 2Pi(A 2Pi) state can be predissociated by 1 4Sigma- forming the S+(4Su) ion and can undergo internal conversion to 1 2Pi followed by the direct dissociation of 1 2Pi forming S+(2Du) and that within the experimental energy range (16.04-16.54 eV) the 1 2Sigma+(B 2Sigma+) state can be predissociated by 1 4Sigma- forming the S+(4Su) ion and can undergo internal conversion to 2 2Pi followed by the predissociation of 2 2Pi by 1 2Sigma- and 1 2Delta forming the S+(2Du) ion. These indications are in line with the experimental fact that both the 4Su and 2Du states of the S+ ion can be formed from the 2 2Pi and 1 2Sigma+ states of the OCS+ ion.
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Affiliation(s)
- Bo-Zhen Chen
- College of Chemistry and Chemical Engineering, Graduate School, Chinese Academy of Sciences, PO Box 4588, Beijing 100049, People's Republic of China.
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14
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Chen BZ, Huang MB, Chang HB. Low-lying electronic states of the OCS+ ion studied using multiconfiguration second-order perturbation theory. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.09.040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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16
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Hochlaf M, Baer T, Qian XM, Ng CY. A vacuum ultraviolet pulsed field ionization-photoelectron study of cyanogen cation in the energy range of 13.2–15.9 eV. J Chem Phys 2005; 123:144302. [PMID: 16238386 DOI: 10.1063/1.2037607] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The vacuum ultraviolet pulsed field ionization-photoelectron and photoionization efficiency spectra of NCCN have been measured in the energy region of 13.25-17.75 eV. The analyses of these spectra have provided accurate ionization energy (IE) values of 13.371+/-0.001, 14.529+/-0.001, 14.770+/-0.001, and 15.516+/-0.001 eV for the formation of NCCN(+) in the X(2)Pi(g), A(2)Sigma(g) (+), B(2)Sigma(u) (+), and C(2)Pi(u) states, respectively. The ionization energy [NCCN(+)(B(2)Sigma(u) (+))] value determined here indicates that the origin of the NCCN(+)(B(2)Sigma(u) (+)) state lies lower in energy by 25 meV than previously reported. A set of spectroscopic parameters for NCCN(+)(X(2)Pi(g)) has been calculated using high level ab initio calculations. The experimental spectra are found to consist of ionizing transitions populating the vibronic levels of NCCN(+), which consist of pure vibronic progressions, combination modes involving the symmetric CN stretch, the CC stretch, and even quanta of the antisymmetric CN stretch, and bending vibrations. These bands are identified with the guidance of the present ab initio calculations.
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Affiliation(s)
- M Hochlaf
- Theoretical Chemistry Group, University of Marne-La-Vallée, Champs Sur Marne, Marne-La-Vallée, France.
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Sommavilla M, Merkt F. Pulsed-Field-Ionization Zero-Kinetic-Energy (PFI-ZEKE) Photoelectron Spectroscopic Study of the Renner−Teller Effect in the Ã+ 2Π State of OCS+. J Phys Chem A 2004. [DOI: 10.1021/jp0478458] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Sommavilla
- Physical Chemistry, ETH Zurich, CH-8093 Zurich, Switzerland
| | - F. Merkt
- Physical Chemistry, ETH Zurich, CH-8093 Zurich, Switzerland
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Hochlaf M, Weitzel KM, Ng CY. Vacuum ultraviolet pulsed-field ionization-photoelectron study of H2S in the energy range of 10–17 eV. J Chem Phys 2004; 120:6944-56. [PMID: 15267593 DOI: 10.1063/1.1669386] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Vacuum ultraviolet pulsed-field ionization-photoelectron (PFI-PE) spectra of H(2)S have been recorded at PFI-PE resolutions of 0.6-1.0 meV in the energy range of 10-17 eV using high-resolution synchrotron radiation. The PFI-PE spectrum, which covers the formation of the valence electronic states H(2)S(+) (X (2)B(1), A (2)A(1), and B (2)B(2)), is compared to the recent high-resolution He I photoelectron spectra of H(2)S obtained by Baltzer et al. [Chem. Phys. 195, 403 (1995)]. In addition to the overwhelmingly dominated origin vibrational band, the PFI-PE spectrum for H(2)S(+)(X (2)B(1)) is found to exhibit weak vibrational progressions due to excitation of the combination bands in the nu(1) (+) symmetric stretching and nu(2) (+) bending modes. While the ionization energy (IE) for H(2)S(+)(X (2)B(1)) obtained here is in accord with values determined in previously laser PFI-PE measurements, the observation of a new PFI-PE band at 12.642+/-0.001 eV suggests that the IE for H(2)S(+)(A (2)A(1)) may be 0.12 eV lower than that reported in the He I study. The simulation of rotational structures resolved in PFI-PE bands shows that the formation of H(2)S(+)(X (2)B(1)) and H(2)S(+)(A (2)A(1)) from photoionization of H(2)S(X (1)A(1)) is dominated by type-C and type-B transitions, respectively. This observation is consistent with predictions of the multichannel quantum defect theory. The small changes in rotational angular momentum observed are consistent with the dominant atomiclike character of the 2b(1) and 5a(1) molecular orbitals of H(2)S. The PFI-PE measurement has revealed perturbations of the (0, 6, 0) K(+)=3 and (0, 6, 0) K(+)=4 bands of H(2)S(+)(A (2)A(1)). Interpreting that these perturbations arise from Renner-Teller interactions at energies close to the common barriers to linearity of the H(2)S(+) (X (2)B(1) and A (2)A(1)) states, we have deduced a barrier of 23,209 cm(-1) for H(2)S(+)(X (2)B(1)) and 5668 cm(-1) for H(2)S(+)(A (2)A(1)). The barrier of 23 209 cm(-1) for H(2)S(+)(X (2)B(1)) is found to be in excellent agreement with the results of previous studies. The vibrational PFI-PE bands for H(2)S(+)(B (2)B(2)) are broad, indicative of the predissociative nature of this state.
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Affiliation(s)
- M Hochlaf
- Theoretical Chemistry Group, University of Marne-La-Vallée, Champs sur Marne, France
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19
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Cossart-Magos C, Jungen M, Xu R, Launay F. High resolution absorption spectrum of jet-cooled OCS between 64 000 and 91 000 cm−1. J Chem Phys 2003. [DOI: 10.1063/1.1587114] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Chen W, Liu J, Ng CY. Vacuum Ultraviolet Pulsed Field Ionization−Photoelectron Study for N2O+ in the Energy Range of 16.3−21.0 eV. J Phys Chem A 2003. [DOI: 10.1021/jp022389d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wenwu Chen
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Jianbo Liu
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - C. Y. Ng
- Department of Chemistry, University of California at Davis, One Shields Avenue, Davis, California 95616
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Liu J, Chen W, Hochlaf M, Qian X, Chang C, Ng CY. Unimolecular decay pathways of state-selected CO2+ in the internal energy range of 5.2–6.2 eV: An experimental and theoretical study. J Chem Phys 2003. [DOI: 10.1063/1.1524180] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Abstract
The recent developments of vacuum ultraviolet (VUV) laser and third generation synchrotron radiation sources, together with the introduction of pulsed field ionization (PFI) schemes for photoion-photoelectron detection, have had a profound impact on the field of VUV spectroscopy and chemistry. Owing to the mediation of near-resonant autoionizing states, rovibronic states of ions with negligible Franck-Condon factors for direct photoionization can be examined by VUV-PFI measurements with rotational resolutions. The VUV-PFI spectra thus obtained have provided definitive ionization energies (IEs) for many small molecules. The recent synchrotron-based PFI-photoelectron-photoion coincidence experiments have demonstrated that dissociative photoionization thresholds for a range of molecules can be determined to the same precision as in PFI-photoelectron measurements. Combining appropriate dissociation thresholds and IEs measured in PFI studies, thermochemical data for many neutrals and cations can be determined with unprecedented precision. The further development of two-color excitation-ionization schemes promises to expand the scope of spectroscopic and chemical applications using the photoionization-photoelectron method.
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Affiliation(s)
- Cheuk-Yiu Ng
- Department of Chemistry, University of California, Davis, California 95616, USA.
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Chen W, Hochlaf M, Rosmus P, He GZ, Ng CY. Vacuum ultraviolet pulsed field ionization-photoelectron study of OCS in the energy range of 15–19 eV. J Chem Phys 2002. [DOI: 10.1063/1.1455622] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Farquar GR, Miller JS, Poliakoff ED, Wang K, McKoy V. Rotationally resolved photoionization: Influence of the 4σ→kσ shape resonance on CO+(B 2Σ+) rotational distributions. J Chem Phys 2001. [DOI: 10.1063/1.1415463] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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Lugez CL, Thompson WE, Jacox ME. The infrared spectra of OCS+ and OCS− trapped in solid neon. J Chem Phys 2001. [DOI: 10.1063/1.1370551] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Rathbone GJ, Poliakoff ED, Bozek JD, Lucchese RR. Resonantly amplified vibronic symmetry breaking. J Chem Phys 2001. [DOI: 10.1063/1.1372334] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Miller JS, Poliakoff ED, Miller TF, Natalense APP, Lucchese RR. Excitation of the symmetry forbidden bending mode in molecular photoionization. J Chem Phys 2001. [DOI: 10.1063/1.1349090] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Liu J, Hochlaf M, Ng CY. Pulsed field ionization–photoelectron bands for CO2+(A 2Πu and B 2Σu+) in the energy range of 17.2–19.0 eV: An experimental and theoretical study. J Chem Phys 2000. [DOI: 10.1063/1.1314354] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Liu J, Hochlaf M, Chambaud G, Rosmus P, Ng CY. High Resolution Pulsed Field Ionization−Photoelectron Bands for CS2+(Ã2Πu): An Experimental and Theoretical Study. J Phys Chem A 2000. [DOI: 10.1021/jp001998n] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jianbo Liu
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - M. Hochlaf
- Theoretical Chemistry Group, University of Marne-La−Vallée, Champs sur Marne, F-77454, Marne-la-Vallée, France
| | - G. Chambaud
- Theoretical Chemistry Group, University of Marne-La−Vallée, Champs sur Marne, F-77454, Marne-la-Vallée, France
| | - P. Rosmus
- Theoretical Chemistry Group, University of Marne-La−Vallée, Champs sur Marne, F-77454, Marne-la-Vallée, France
| | - C. Y. Ng
- Ames Laboratory, USDOE, and Department of Chemistry, Iowa State University, Ames, Iowa 50011
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Liu J, Chen W, Hsu CW, Hochlaf M, Evans M, Stimson S, Ng CY. High resolution pulsed field ionization–photoelectron study of CO2+(X 2Πg) in the energy range of 13.6–14.7 eV. J Chem Phys 2000. [DOI: 10.1063/1.481721] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Feng R, Cooper G, Sakai Y, Brion C. Dipole (e,e+ ion) coincidence studies of the ionic photofragmentation and photoionization of carbonyl sulfide in the valence shell and S 2p, 2s and C 1s inner shell regions (10–300 eV). Chem Phys 2000. [DOI: 10.1016/s0301-0104(00)00083-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Feng R, Cooper G, Brion C. Quantitative studies of the photoabsorption of carbonyl sulphide in the valence-shell, S 2p,2s and C 1s inner-shell regions (4–360 eV) by dipole electron impact spectroscopies. Chem Phys 2000. [DOI: 10.1016/s0301-0104(99)00363-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Song Y, Evans M, Ng CY, Hsu CW, Jarvis GK. Rotationally resolved pulsed field ionization photoelectron bands of O2+(X 2Π1/2,3/2g, v+=0–38) in the energy range of 12.05–18.15 eV. J Chem Phys 1999. [DOI: 10.1063/1.479459] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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Cheng BM, Hung WC. Photoionization efficiency spectrum and ionization energy of S2O2. J Chem Phys 1999. [DOI: 10.1063/1.478094] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Evans M, Stimson S, Ng CY, Hsu CW. High-resolution pulsed field ionization photoelectron study of O2: Predissociation lifetimes and high-n Rydberg lifetimes converging to O2+(c 4Σu−, v+=0,1). J Chem Phys 1998. [DOI: 10.1063/1.476678] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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