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Wang T, Yang T, Xiao C, Yang X. Vibration to Vibration: Product Energy Distribution of F + HD Crossed Molecular Beam Experiments. J Phys Chem A 2024; 128:3180-3185. [PMID: 38626324 DOI: 10.1021/acs.jpca.4c01523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2024]
Abstract
We investigated the F + HD(v = 1, j = 0) → HF + D reaction using the crossed molecular beam technique combined with the D atom Rydberg tagging time-of-flight spectroscopy. By detecting the products at various scattering angles for different collision energies in the range of 0.8-1.2 kcal/mol, we observed the forward-scattering products of HF(v' = 4) and determined the threshold energy for the opening of this reaction channel. Similar experiments were conducted for the F + HD(v = 0, j = 0) → HF + D reaction within the range of 1.1-1.6 kcal/mol, where forward-scattering products of HF(v' = 3) were observed, and the threshold energy for this reaction channel was determined as well. Furthermore, we measured the differential cross-sections for the F + HD → HF + D reaction in both the vibrational ground state and the excited state of HD and analyzed the vibrational quantum-state distribution of the HF products. It was found that the population of vibrational quantum states of the HF products increases synchronously with the excitation of the reactant HD vibrationally.
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Affiliation(s)
- Tao Wang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China
- Department of Chemistry, College of Science, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Tiangang Yang
- Department of Chemistry, College of Science, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Chunlei Xiao
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China
| | - Xueming Yang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China
- Department of Chemistry, College of Science, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
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Yang T, Huang L, Wang T, Xiao C, Xie Y, Sun Z, Dai D, Chen M, Zhang D, Yang X. Effect of Reagent Vibrational Excitation on the Dynamics of F + H2(v = 1, j = 0) → HF(v′, j′) + H Reaction. J Phys Chem A 2015; 119:12284-90. [DOI: 10.1021/acs.jpca.5b06395] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tiangang Yang
- Key
Laboratory of Materials Modification by Laser, Electron, and Ion Beams
(Ministry of Education), School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024 Liaoning, P. R. China
- State
Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of
Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 Liaoning, P. R. China
| | - Long Huang
- State
Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of
Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 Liaoning, P. R. China
| | - Tao Wang
- State
Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of
Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 Liaoning, P. R. China
- Synergetic
Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Chunlei Xiao
- State
Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of
Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 Liaoning, P. R. China
| | - Yurun Xie
- State
Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of
Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 Liaoning, P. R. China
| | - Zhigang Sun
- State
Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of
Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 Liaoning, P. R. China
- Synergetic
Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Dongxu Dai
- State
Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of
Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 Liaoning, P. R. China
| | - Maodu Chen
- Key
Laboratory of Materials Modification by Laser, Electron, and Ion Beams
(Ministry of Education), School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024 Liaoning, P. R. China
| | - Donghui Zhang
- State
Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of
Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 Liaoning, P. R. China
- Synergetic
Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xueming Yang
- State
Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of
Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 Liaoning, P. R. China
- Synergetic
Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
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Mukherjee N, Dong W, Zare RN. Coherent superposition of M-states in a single rovibrational level of H2 by Stark-induced adiabatic Raman passage. J Chem Phys 2014; 140:074201. [PMID: 24559344 DOI: 10.1063/1.4865131] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We prepare an ensemble of isolated rovibrationally excited (v = 1, J = 2) H2 molecules in a phase-locked superposition of magnetic sublevels M using Stark-induced adiabatic Raman passage with linearly polarized single-mode pump (at 532 nm, ∼6 ns pulse duration, 200 mJ/pulse) and Stokes (699 nm, ∼4 ns pulse duration, 20 mJ/pulse) laser excitation. A biaxial superposition state, given by [line]ψ(t)⟩ = 1/√(2)[[line]ν = 1, J = 2, M = -2⟩ - [line]ν = 1, J = 2, M = +2⟩], is prepared with linearly but cross-polarized pump and Stokes laser pulses copropagating along the quantization z-axis. The degree of phase coherence is measured by using the O(2) line of the H2 E,F-X (0,1) band via 2 + 1 resonance enhanced multiphoton ionization (REMPI) at 210.8 nm by recording interference fringes in the REMPI signal in a time-of-flight mass spectrometer as the direction of the UV laser polarization is rotated using a half-wave plate. Nearly 60% population transfer from H2 (v = 0, J = 0) ground state to the superposition state in H2 (v = 1, J = 2) is measured from the depletion of the Q(0) line of the E,F-X (0,0) band as the Stokes frequency is tuned across the (v = 0, J = 0) → (v = 1, J = 2) Raman resonance.
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Affiliation(s)
- Nandini Mukherjee
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA
| | - Wenrui Dong
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA
| | - Richard N Zare
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA
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Herráez-Aguilar D, Jambrina PG, Aldegunde J, Sáez-Rábanos V, de Miranda MP, Aoiz FJ. The reactive collision mechanism evinced: stereodynamical control of the elementary Br + H2 → H + HBr reaction. Phys Chem Chem Phys 2013; 15:13513-22. [PMID: 23823942 DOI: 10.1039/c3cp51271a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
From a kinetics standpoint, reactive molecular collisions are the building blocks of the mechanisms of chemical reactions. In contrast, a dynamics standpoint reveals molecular collisions to have their own internal mechanisms, which are not mere theoretical abstractions: through suitable preparation of the reactants internal and stereochemical states, features of the mechanisms of a reactive molecular collision can be made evident and used as "handles" to control the reaction outcome. Using time-independent quantum dynamical calculations, we demonstrate this for the Br + H2(v = 0-1, j = 2) → H + HBr reaction in the 1.0-1.6 eV range of total energies. Despite its pronounced effect on reactivity, which is in agreement with the predictions from Polanyi rules, reactant vibration is found to have little effect on the mechanism of this endoergic, late-barrier reaction. Analysis of the correlations between directional reaction properties shows that the collision stereochemistry strongly depends on the total energy, but not on how this energy is partitioned between reactant translation and vibration. The stereodynamical preferences implied by the collision mechanisms determine how and to what extent one can control the reaction. Regarding the overall reaction, the extent of control is found to be large near the reaction threshold but not when the total energy is high. Regarding state-to-state reactions, the effect of reactant stereochemistry on the product rotational state distribution is found to be nontrivial and energy dependent.
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Affiliation(s)
- D Herráez-Aguilar
- Departamento de Quimica Fisica I, Facultad de Quimica, Universidad Complutense de Madrid, 28040, Spain
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