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Liu W, Gong P, Huang W, Sun M, Zhao S, Lin Z, Yao J. Mixed Alkali Metal and Alkaline Earth Metal Scandium Borate Birefringence Material with Layered Structure and Short Ultraviolet Cutoff Edge. Inorg Chem 2023. [PMID: 37319381 DOI: 10.1021/acs.inorgchem.3c01459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Birefringent crystals are essential in the domains of linear and nonlinear optics that need light wave polarization control. Rare earth borate has become a popular study material for ultraviolet (UV) birefringence crystals due to its short cutoff edge in the UV area. RbBaScB6O12, a two-dimensional layered structure compound with the B3O6 group, was effectively synthesized through spontaneous crystallization. The UV cutoff edge of RbBaScB6O12 is shorter than 200 nm, and the experimental birefringence is 0.139 @ 550 nm. Theoretical research indicates that the large birefringence originates from the synergistic impact of the B3O6 group and the ScO6 octahedron. RbBaScB6O12 is an outstanding candidate material for birefringence crystals in the UV and even deep UV regions due to its short UV cutoff edge and significant birefringence.
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Affiliation(s)
- Wenhao Liu
- Beijing Center for Crystal Research and Development, Key Lab of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Pifu Gong
- Functional Crystals Lab, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Weiqi Huang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China
| | - Mengran Sun
- Beijing Center for Crystal Research and Development, Key Lab of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Sangen Zhao
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China
| | - Zheshuai Lin
- Functional Crystals Lab, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Jiyong Yao
- Beijing Center for Crystal Research and Development, Key Lab of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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2
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Selby TM, Goulay F, Soorkia S, Ray A, Jasper AW, Klippenstein SJ, Morozov AN, Mebel AM, Savee JD, Taatjes CA, Osborn DL. Radical-Radical Reactions in Molecular Weight Growth: The Phenyl + Propargyl Reaction. J Phys Chem A 2023; 127:2577-2590. [PMID: 36905386 DOI: 10.1021/acs.jpca.2c08121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
The mechanism for hydrocarbon ring growth in sooting environments is still the subject of considerable debate. The reaction of phenyl radical (C6H5) with propargyl radical (H2CCCH) provides an important prototype for radical-radical ring-growth pathways. We studied this reaction experimentally over the temperature range of 300-1000 K and pressure range of 4-10 Torr using time-resolved multiplexed photoionization mass spectrometry. We detect both the C9H8 and C9H7 + H product channels and report experimental isomer-resolved product branching fractions for the C9H8 product. We compare these experiments to theoretical kinetics predictions from a recently published study augmented by new calculations. These ab initio transition state theory-based master equation calculations employ high-quality potential energy surfaces, conventional transition state theory for the tight transition states, and direct CASPT2-based variable reaction coordinate transition state theory (VRC-TST) for the barrierless channels. At 300 K only the direct adducts from radical-radical addition are observed, with good agreement between experimental and theoretical branching fractions, supporting the VRC-TST calculations of the barrierless entrance channel. As the temperature is increased to 1000 K we observe two additional isomers, including indene, a two-ring polycyclic aromatic hydrocarbon, and a small amount of bimolecular products C9H7 + H. Our calculated branching fractions for the phenyl + propargyl reaction predict significantly less indene than observed experimentally. We present further calculations and experimental evidence that the most likely cause of this discrepancy is the contribution of H atom reactions, both H + indenyl (C9H7) recombination to indene and H-assisted isomerization that converts less stable C9H8 isomers into indene. Especially at low pressures typical of laboratory investigations, H-atom-assisted isomerization needs to be considered. Regardless, the experimental observation of indene demonstrates that the title reaction leads, either directly or indirectly, to the formation of the second ring in polycyclic aromatic hydrocarbons.
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Affiliation(s)
- Talitha M Selby
- Department of Mathematics and Natural Sciences, University of Wisconsin-Milwaukee, West Bend, Wisconsin 53095, United States
| | - Fabien Goulay
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506, United States
| | - Satchin Soorkia
- Institut des Sciences Moléculaires d'Orsay, Université Paris-Saclay, CNRS, F-91405 Orsay, France
| | - Amelia Ray
- Department of Chemistry, University of Wisconsin-Parkside, Kenosha, Wisconsin 53144, United States
| | - Ahren W Jasper
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Stephen J Klippenstein
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Alexander N Morozov
- Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| | - Alexander M Mebel
- Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| | - John D Savee
- KLA Corporation, Milpitas, California 95035, United States
| | - Craig A Taatjes
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551, United States
| | - David L Osborn
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551, United States
- Department of Chemical Engineering, University of California, Davis, Davis, California 95616, United States
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3
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Jin C, Li F, Cheng B, Qiu H, Yang Z, Pan S, Mutailipu M. Double-Modification Oriented Design of a Deep-UV Birefringent Crystal Functionalized by [B 12 O 16 F 4 (OH) 4 ] Clusters. Angew Chem Int Ed Engl 2022; 61:e202203984. [PMID: 35538644 DOI: 10.1002/anie.202203984] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Indexed: 11/06/2022]
Abstract
Polarization modulation of deep-UV light is of significance to current technologies, and to this end, the birefringent crystal has emerged as an invaluable material as it allows for effective light modulation. Herein, a double-modification strategy driven by F and OH anions that makes double effects towards the critical property enhancement of deep-UV birefringent crystals is proposed. This leads to a new hydroxyborate (NH4 )4 [B12 O16 F4 (OH)4 ] with giant cluster as a deep-UV birefringent crystal with large birefringence (Δnexp. =0.12@546.1 nm). This birefringence is a record among inorganic hydroxyborates with experimentally measured birefringence. Structural analysis shows that the near-plane arrangement of [B12 O16 F4 (OH)4 ] cluster is responsible for the large optical anisotropy. Theoretical calculations indicate that its π-conjugated [BO3 ] and [BO2 OH] units are the main source of this large optical anisotropy.
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Affiliation(s)
- Congcong Jin
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi, 830011, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Fuming Li
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi, 830011, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Bingliang Cheng
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi, 830011, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Haotian Qiu
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi, 830011, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhihua Yang
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi, 830011, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shilie Pan
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi, 830011, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Miriding Mutailipu
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi, 830011, China.,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
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4
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Jin C, Li F, Cheng B, Qiu H, Yang Z, Pan S, Mutailipu M. Double‐Modification Oriented Design of a Deep‐UV Birefringent Crystal Functionalized by [B
12
O
16
F
4
(OH)
4
] Clusters. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203984] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Congcong Jin
- CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Technical Institute of Physics & Chemistry, CAS Xinjiang Key Laboratory of Electronic Information Materials and Devices 40-1 South Beijing Road Urumqi 830011 China
- Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China
| | - Fuming Li
- CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Technical Institute of Physics & Chemistry, CAS Xinjiang Key Laboratory of Electronic Information Materials and Devices 40-1 South Beijing Road Urumqi 830011 China
- Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China
| | - Bingliang Cheng
- CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Technical Institute of Physics & Chemistry, CAS Xinjiang Key Laboratory of Electronic Information Materials and Devices 40-1 South Beijing Road Urumqi 830011 China
- Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China
| | - Haotian Qiu
- CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Technical Institute of Physics & Chemistry, CAS Xinjiang Key Laboratory of Electronic Information Materials and Devices 40-1 South Beijing Road Urumqi 830011 China
- Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China
| | - Zhihua Yang
- CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Technical Institute of Physics & Chemistry, CAS Xinjiang Key Laboratory of Electronic Information Materials and Devices 40-1 South Beijing Road Urumqi 830011 China
- Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China
| | - Shilie Pan
- CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Technical Institute of Physics & Chemistry, CAS Xinjiang Key Laboratory of Electronic Information Materials and Devices 40-1 South Beijing Road Urumqi 830011 China
- Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China
| | - Miriding Mutailipu
- CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Technical Institute of Physics & Chemistry, CAS Xinjiang Key Laboratory of Electronic Information Materials and Devices 40-1 South Beijing Road Urumqi 830011 China
- Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China
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5
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Song Y, Liang F, Tian H, Wu Y, Luo M. Molecular Engineering Design of the First Sr 2Be 2B 2O 7-type Fluoride Carbonates AMgLi 2(CO 3) 2F (A=K, Rb) as Deep-Ultraviolet Birefringent Crystal ※. ACTA CHIMICA SINICA 2022. [DOI: 10.6023/a21120550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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6
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Jin W, Zhang W, Tudi A, Wang L, Zhou X, Yang Z, Pan S. Fluorine-Driven Enhancement of Birefringence in the Fluorooxosulfate: A Deep Evaluation from a Joint Experimental and Computational Study. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2003594. [PMID: 34085784 PMCID: PMC8336506 DOI: 10.1002/advs.202003594] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 03/16/2021] [Indexed: 06/02/2023]
Abstract
Understanding and exploring the functional modules (FMs) consisting of local atomic groups can promote the development of the materials with functional performances. Oxygen-containing tetrahedral modules are popular in deep-ultraviolet (DUV) optical materials, but their weak optical anisotropy is adverse to birefringence. Here, the fluorooxosulfate group is proved as a new birefringence-enhanced FM for the first time. The birefringence of fluorooxosulfates can be 4.8-15.5 times that of sulfates with the same metal cations while maintaining a DUV band gap. The polarizing microscope measurement confirms the birefringence enhancement by using the millimeter crystals experimentally. The theoretical studies from micro and macro levels further reveal a novel universal strategy that the fluorine induced anisotropic electronic distribution in fluorooxo-tetrahedral group is responsible for the enhancement of birefringence. This study will guide the future discovery of DUV optical materials with enlarged birefringence.
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Affiliation(s)
- Wenqi Jin
- CAS Key Laboratory of Functional Materials and Devices for Special EnvironmentsXinjiang Technical Institute of Physics & Chemistry of CASXinjiang Key Laboratory of Electronic Information Materials and Devices40‐1 South Beijing RoadUrumqi830011China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Wenyao Zhang
- CAS Key Laboratory of Functional Materials and Devices for Special EnvironmentsXinjiang Technical Institute of Physics & Chemistry of CASXinjiang Key Laboratory of Electronic Information Materials and Devices40‐1 South Beijing RoadUrumqi830011China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Abudukadi Tudi
- CAS Key Laboratory of Functional Materials and Devices for Special EnvironmentsXinjiang Technical Institute of Physics & Chemistry of CASXinjiang Key Laboratory of Electronic Information Materials and Devices40‐1 South Beijing RoadUrumqi830011China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Liying Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular PhysicsNational Center for Magnetic Resonance in WuhanWuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan430071China
| | - Xin Zhou
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular PhysicsNational Center for Magnetic Resonance in WuhanWuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan430071China
| | - Zhihua Yang
- CAS Key Laboratory of Functional Materials and Devices for Special EnvironmentsXinjiang Technical Institute of Physics & Chemistry of CASXinjiang Key Laboratory of Electronic Information Materials and Devices40‐1 South Beijing RoadUrumqi830011China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Shilie Pan
- CAS Key Laboratory of Functional Materials and Devices for Special EnvironmentsXinjiang Technical Institute of Physics & Chemistry of CASXinjiang Key Laboratory of Electronic Information Materials and Devices40‐1 South Beijing RoadUrumqi830011China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
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7
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Matthaei CT, Mukhopadhyay DP, Fischer I. Photodissociation of Benzoyl Chloride: A Velocity Map Imaging Study Using VUV Detection of Chlorine Atoms. J Phys Chem A 2021; 125:2816-2825. [PMID: 33819043 DOI: 10.1021/acs.jpca.0c11236] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
UV photodissociation of benzoyl chloride, Ph-CO-Cl, is associated with the loss of a chlorine atom. Here we excite benzoyl chloride to the S1, S2, and S3 excited states at 237, 253, 265, and 279.6 nm and detect the Cl photofragment by [1 + 1'] photoionization using 118.9 nm VUV radiation. The translational energy distribution of the Cl atom is measured by velocity map ion imaging. An isotropic image and a unimodal translational energy distribution are observed at all dissociation wavelengths, and a fraction of 18-20% of the excess energy is released into translation. The results indicate a dissociation that predominately proceeds from the vibrationally hot S0 ground state, although the observed translational energy release deviates significantly from a prior distribution. However, the impulsive model does also not represent the translational energy release. As a Cl/Cl* branching ratio of 9:1 or more is observed in one-color experiments at 235 nm, we conclude that direct dissociation from excited electronic states contributes only to a minor extent.
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Affiliation(s)
- Christian T Matthaei
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Deb Pratim Mukhopadhyay
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Ingo Fischer
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
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8
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Foley CD, Alavi ST, Joalland B, Broderick BM, Dias N, Suits AG. Imaging the infrared multiphoton excitation and dissociation of propargyl chloride. Phys Chem Chem Phys 2019; 21:1528-1535. [PMID: 30617359 DOI: 10.1039/c8cp06668j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Infrared multiphoton excitation is combined with UV excitation and state-resolved probes of Cl(2P3/2), Cl*(2P1/2), and HCl to study the photochemistry of propargyl chloride. The results show evidence both of infrared multiphoton dissociation on the ground electronic state and infrared multiphoton excitation followed by UV dissociation. The results are interpreted with the aid of a full characterization of the stationary points on the ground state using ab initio methods, as well as our recent experimental and theoretical characterization of the UV photochemistry of the molecule. The data suggest elimination of HCl on the ground electronic state produces linear propadienylidene as a coproduct over a roaming-like transition state that accesses the Cl-H-C abstraction geometry. This identification is supported by separate chirped-pulse microwave studies in a quasi-uniform flow also reported here.
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Affiliation(s)
- Casey D Foley
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA.
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9
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Huang C, Han G, Li H, Zhang F, Yang Z, Pan S. A new barium fluorooxoborate BaB5O8F·xH2O with large birefringence and a wide UV transparency window. Dalton Trans 2019; 48:6714-6717. [DOI: 10.1039/c9dt00106a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
By a cation substitution strategy, a new barium fluorooxoborate BaB5O8F was synthesized, which exhibits two interesting interpenetrating three-dimensional B–O/F frameworks and improved optical properties.
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Affiliation(s)
- Chunmei Huang
- CAS Key Laboratory of Functional Materials and Devices for Special Environments; Xinjiang Technical Institute of Physics & Chemistry
- CAS; Xinjiang Key Laboratory of Electronic Information Materials and Devices
- Urumqi 830011
- China
- Center of Materials Science and Optoelectronics Engineering
| | - Guopeng Han
- CAS Key Laboratory of Functional Materials and Devices for Special Environments; Xinjiang Technical Institute of Physics & Chemistry
- CAS; Xinjiang Key Laboratory of Electronic Information Materials and Devices
- Urumqi 830011
- China
- Center of Materials Science and Optoelectronics Engineering
| | - Hao Li
- CAS Key Laboratory of Functional Materials and Devices for Special Environments; Xinjiang Technical Institute of Physics & Chemistry
- CAS; Xinjiang Key Laboratory of Electronic Information Materials and Devices
- Urumqi 830011
- China
- Center of Materials Science and Optoelectronics Engineering
| | - Fangfang Zhang
- CAS Key Laboratory of Functional Materials and Devices for Special Environments; Xinjiang Technical Institute of Physics & Chemistry
- CAS; Xinjiang Key Laboratory of Electronic Information Materials and Devices
- Urumqi 830011
- China
- Center of Materials Science and Optoelectronics Engineering
| | - Zhihua Yang
- CAS Key Laboratory of Functional Materials and Devices for Special Environments; Xinjiang Technical Institute of Physics & Chemistry
- CAS; Xinjiang Key Laboratory of Electronic Information Materials and Devices
- Urumqi 830011
- China
- Center of Materials Science and Optoelectronics Engineering
| | - Shilie Pan
- CAS Key Laboratory of Functional Materials and Devices for Special Environments; Xinjiang Technical Institute of Physics & Chemistry
- CAS; Xinjiang Key Laboratory of Electronic Information Materials and Devices
- Urumqi 830011
- China
- Center of Materials Science and Optoelectronics Engineering
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10
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Chen X, Zhang B, Zhang F, Wang Y, Zhang M, Yang Z, Poeppelmeier KR, Pan S. Designing an Excellent Deep-Ultraviolet Birefringent Material for Light Polarization. J Am Chem Soc 2018; 140:16311-16319. [DOI: 10.1021/jacs.8b10009] [Citation(s) in RCA: 262] [Impact Index Per Article: 37.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Xinglong Chen
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry of ACS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi 830011, China
| | - Bingbing Zhang
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry of ACS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi 830011, China
| | - Fangfang Zhang
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry of ACS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi 830011, China
| | - Ying Wang
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry of ACS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi 830011, China
| | - Min Zhang
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry of ACS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi 830011, China
| | - Zhihua Yang
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry of ACS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi 830011, China
| | - Kenneth R. Poeppelmeier
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Shilie Pan
- CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry of ACS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi 830011, China
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11
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Zhang Z, Wang Y, Zhang B, Yang Z, Pan S. Designing Deep-UV Birefringent Crystals by Cation Regulation. Chemistry 2018; 24:11267-11272. [DOI: 10.1002/chem.201802866] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Zhizhong Zhang
- CAS Key Laboratory of Functional Materials, and Devices for Special Environments; Xinjiang Technical Institute of Physics & Chemistry of CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices; 40-1 South Beijing Road Urumqi 830011 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Ying Wang
- CAS Key Laboratory of Functional Materials, and Devices for Special Environments; Xinjiang Technical Institute of Physics & Chemistry of CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices; 40-1 South Beijing Road Urumqi 830011 China
| | - Bingbing Zhang
- CAS Key Laboratory of Functional Materials, and Devices for Special Environments; Xinjiang Technical Institute of Physics & Chemistry of CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices; 40-1 South Beijing Road Urumqi 830011 China
| | - Zhihua Yang
- CAS Key Laboratory of Functional Materials, and Devices for Special Environments; Xinjiang Technical Institute of Physics & Chemistry of CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices; 40-1 South Beijing Road Urumqi 830011 China
| | - Shilie Pan
- CAS Key Laboratory of Functional Materials, and Devices for Special Environments; Xinjiang Technical Institute of Physics & Chemistry of CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices; 40-1 South Beijing Road Urumqi 830011 China
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12
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Foley CD, Joalland B, Alavi ST, Suits AG. Mixed transitions in the UV photodissociation of propargyl chloride revealed by slice imaging and multireference ab initio calculations. Phys Chem Chem Phys 2018; 20:27474-27481. [DOI: 10.1039/c8cp04596h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Resonance-enhanced multiphoton ionization (REMPI) and DC slice imaging were used to detect photoproducts Cl (2P3/2), spin–orbit excited Cl* (2P1/2), and C3H3 in the photodissociation of propargyl chloride at 212 and 236 nm.
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Affiliation(s)
- Casey D. Foley
- Department of Chemistry
- University of Missouri
- Columbia
- USA
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13
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Kushnarenko A, Miloglyadov E, Quack M, Seyfang G. Intramolecular vibrational energy redistribution in HCCCH2X (X = Cl, Br, I) measured by femtosecond pump–probe experiments in a hollow waveguide. Phys Chem Chem Phys 2018; 20:10949-10959. [DOI: 10.1039/c7cp08561c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Time resolved femtosecond probing of intramolecular energy flow after excitation of the two different infrared CH-chromophores in these bichromophoric molecules shows strong dependence on the chemical environment of the initial excitation.
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Affiliation(s)
- Alexander Kushnarenko
- ETH Zurich, Lab. für Physikalische Chemie
- HCI E235
- Vladimir-Prelog-Weg 1-5/10
- 8093 Zurich
- Switzerland
| | - Eduard Miloglyadov
- ETH Zurich, Lab. für Physikalische Chemie
- HCI E235
- Vladimir-Prelog-Weg 1-5/10
- 8093 Zurich
- Switzerland
| | - Martin Quack
- ETH Zurich, Lab. für Physikalische Chemie
- HCI E235
- Vladimir-Prelog-Weg 1-5/10
- 8093 Zurich
- Switzerland
| | - Georg Seyfang
- ETH Zurich, Lab. für Physikalische Chemie
- HCI E235
- Vladimir-Prelog-Weg 1-5/10
- 8093 Zurich
- Switzerland
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14
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Shi G, Zhang F, Zhang B, Hou D, Chen X, Yang Z, Pan S. Na2B6O9F2: A Fluoroborate with Short Cutoff Edge and Deep-Ultraviolet Birefringent Property Prepared by an Open High-Temperature Solution Method. Inorg Chem 2016; 56:344-350. [DOI: 10.1021/acs.inorgchem.6b02269] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guoqiang Shi
- Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences, 40-1 South Beijing Road, Urumqi 830011, China
- University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Fangfang Zhang
- Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences, 40-1 South Beijing Road, Urumqi 830011, China
| | - Bingbing Zhang
- Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences, 40-1 South Beijing Road, Urumqi 830011, China
| | - Dianwei Hou
- Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences, 40-1 South Beijing Road, Urumqi 830011, China
- University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Xinglong Chen
- Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences, 40-1 South Beijing Road, Urumqi 830011, China
- University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Zhihua Yang
- Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences, 40-1 South Beijing Road, Urumqi 830011, China
| | - Shilie Pan
- Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences, 40-1 South Beijing Road, Urumqi 830011, China
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15
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Liu L, Yang Y, Li L, Yang Z, Pan S. Pb2Bi2GaB3O11, a new congruent-melting galloborate containing two types of asymmetric cations with a moderate birefringence. Dalton Trans 2016; 45:18977-18983. [DOI: 10.1039/c6dt03761e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pb2Bi2GaB3O11possesses a moderate birefringence of 0.07 at 589 nm originating from two stereoactive lone-pair cations and π-conjugated BO3groups.
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Affiliation(s)
- Lili Liu
- Key Laboratory of Functional Materials and Devices for Special Environments of CAS; Xinjiang Key Laboratory of Electronic Information Materials and Devices
- Xinjiang Technical Institute of Physics & Chemistry of CAS
- Urumqi 830011
- China
- University of Chinese Academy of Sciences
| | - Yun Yang
- Key Laboratory of Functional Materials and Devices for Special Environments of CAS; Xinjiang Key Laboratory of Electronic Information Materials and Devices
- Xinjiang Technical Institute of Physics & Chemistry of CAS
- Urumqi 830011
- China
| | - Linping Li
- Key Laboratory of Functional Materials and Devices for Special Environments of CAS; Xinjiang Key Laboratory of Electronic Information Materials and Devices
- Xinjiang Technical Institute of Physics & Chemistry of CAS
- Urumqi 830011
- China
| | - Zhihua Yang
- Key Laboratory of Functional Materials and Devices for Special Environments of CAS; Xinjiang Key Laboratory of Electronic Information Materials and Devices
- Xinjiang Technical Institute of Physics & Chemistry of CAS
- Urumqi 830011
- China
| | - Shilie Pan
- Key Laboratory of Functional Materials and Devices for Special Environments of CAS; Xinjiang Key Laboratory of Electronic Information Materials and Devices
- Xinjiang Technical Institute of Physics & Chemistry of CAS
- Urumqi 830011
- China
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16
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Zhao J, Ma Y, Li R. Characterization of polarizer made of the deep-UV birefringent crystal Ba2Mg(B3O6)2. APPLIED OPTICS 2015; 54:9949-9953. [PMID: 26836562 DOI: 10.1364/ao.54.009949] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In optical communications and the laser industry, modulating the polarization of light requires crystals with both large birefringence and a wide transparent range. A good candidate for a deep-UV birefringent crystal is Ba2Mg(B3O6) because it has a large birefringence and short UV cutoff edge. We grew Ba2Mg(B3O6)2 crystals with sizes up to 41 mm×40 mm×7 mm using the top-seeded solution growth method. We obtained the thermal-expansion coefficients in different directions and the thermo-optic coefficients and then designed and manufactured a Glan-Taylor type polarizer to fulfill the commercial requirements.
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17
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Saha A, Kawade M, SenGupta S, Upadhyaya HP, Kumar A, Naik PD. Photodissociation Dynamics of Benzoyl Chloride at 235 nm: Resonance-Enhanced Multiphoton Ionization Detection of Cl and HCl. J Phys Chem A 2014; 118:1185-95. [DOI: 10.1021/jp410511c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ankur Saha
- Radiation and Photochemistry
Division, Bhabha Atomic Research Centre, Trombay Mumbai − 400 085, Maharashtra, India
| | - Monali Kawade
- Radiation and Photochemistry
Division, Bhabha Atomic Research Centre, Trombay Mumbai − 400 085, Maharashtra, India
| | - Sumana SenGupta
- Radiation and Photochemistry
Division, Bhabha Atomic Research Centre, Trombay Mumbai − 400 085, Maharashtra, India
| | - Hari P. Upadhyaya
- Radiation and Photochemistry
Division, Bhabha Atomic Research Centre, Trombay Mumbai − 400 085, Maharashtra, India
| | - Awadhesh Kumar
- Radiation and Photochemistry
Division, Bhabha Atomic Research Centre, Trombay Mumbai − 400 085, Maharashtra, India
| | - Prakash D. Naik
- Radiation and Photochemistry
Division, Bhabha Atomic Research Centre, Trombay Mumbai − 400 085, Maharashtra, India
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18
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Li R. On the calculation of refractive indices of borate crystals based on group approximation. Z KRIST-CRYST MATER 2013. [DOI: 10.1524/zkri.2013.1628] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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19
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Zhang Y, Chen Z, Man Y, Guo P. Dissociative adsorption of 3-chloropropyne on Si(111)-(7 × 7): binding and structure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:1868-1874. [PMID: 23327651 DOI: 10.1021/la304018a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
To achieve silicon functionalization for the development of hybrid devices, multifunctional molecules may be employed to attach to the silicon surfaces. It is important to get a fundamental understanding about the molecule/silicon interface chemistry and the binding configuration. The surface chemistry of 3-chloropropyne (HC≡C-CH(2)Cl) on the Si(111)-(7 × 7) surface, as a model system for understanding the interaction of the multifunctional molecules with a silicon surface, was studied by X-ray photoelectron spectroscopy (XPS), high-resolution electron energy loss spectroscopy (HREELS), and density functional theory (DFT). The 3-chloropropyne adsorbs molecularly on the silicon surface at 110 K. A chemical reaction clearly occurs such that 3-choloropropyne bonds onto the Si(111)-(7 × 7) surface at room temperature by forming C-Si linkage through the cleavage of C-Cl bond, and preserving the ethyne C≡C triple bond. This functionalized silicon surface may act as an intermediate for the growth of multiple organic layers by further attaching other functional molecules.
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Affiliation(s)
- Yongping Zhang
- School of Materials Science and Technology, Southwest University, Chongqing 400715, People's Republic of China.
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20
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Savee JD, Soorkia S, Welz O, Selby TM, Taatjes CA, Osborn DL. Absolute photoionization cross-section of the propargyl radical. J Chem Phys 2012; 136:134307. [PMID: 22482552 DOI: 10.1063/1.3698282] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Using synchrotron-generated vacuum-ultraviolet radiation and multiplexed time-resolved photoionization mass spectrometry we have measured the absolute photoionization cross-section for the propargyl (C(3)H(3)) radical, σ(propargyl) (ion)(E), relative to the known absolute cross-section of the methyl (CH(3)) radical. We generated a stoichiometric 1:1 ratio of C(3)H(3):CH(3) from 193 nm photolysis of two different C(4)H(6) isomers (1-butyne and 1,3-butadiene). Photolysis of 1-butyne yielded values of σ(propargyl)(ion)(10.213 eV)=(26.1±4.2) Mb and σ(propargyl)(ion)(10.413 eV)=(23.4±3.2) Mb, whereas photolysis of 1,3-butadiene yielded values of σ(propargyl)(ion)(10.213 eV)=(23.6±3.6) Mb and σ(propargyl)(ion)(10.413 eV)=(25.1±3.5) Mb. These measurements place our relative photoionization cross-section spectrum for propargyl on an absolute scale between 8.6 and 10.5 eV. The cross-section derived from our results is approximately a factor of three larger than previous determinations.
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Affiliation(s)
- John D Savee
- Sandia National Laboratories, Combustion Research Facility, Livermore, California 94551, USA
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21
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Saha A, Upadhyaya HP, Kumar A, Naik PD, Bajaj PN. Dynamics of CCl bond fission in photodissociation of 2-furoyl chloride at 235nm. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2012.04.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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22
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Li RK, Ma Y. Chemical engineering of a birefringent crystal transparent in the deep UV range. CrystEngComm 2012. [DOI: 10.1039/c2ce25240f] [Citation(s) in RCA: 96] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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24
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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: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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Zheng X, Song Y, Zhang J. Ultraviolet Photodissociation Dynamics of the Propargyl Radical. J Phys Chem A 2009; 113:4604-12. [DOI: 10.1021/jp8113336] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xianfeng Zheng
- Department of Chemistry, University of California at Riverside, Riverside, California 92521
| | - Yu Song
- Department of Chemistry, University of California at Riverside, Riverside, California 92521
| | - Jingsong Zhang
- Department of Chemistry, University of California at Riverside, Riverside, California 92521
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26
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Fan H, Pratt ST, Miller JA. Secondary decomposition of C3H5 radicals formed by the photodissociation of 2-bromopropene. J Chem Phys 2007; 127:144301. [DOI: 10.1063/1.2775445] [Citation(s) in RCA: 4] [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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27
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Krisch MJ, Bell MJ, Fitzpatrick BL, McCunn LR, Lau KC, Liu Y, Butler LJ. Photodissociation Pathways of 1,1-Dichloroacetone. J Phys Chem A 2007; 111:5968-80. [PMID: 17571861 DOI: 10.1021/jp068208f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present a comprehensive investigation of the dissociation dynamics following photoexcitation of 1,1-dichloroacetone (CH(3)COCHCl(2)) at 193 nm. Two major dissociation channels are observed: cleavage of a C-Cl bond to form CH(3)C(O)CHCl + Cl and elimination of HCl. The branching between these reaction channels is roughly 9:1. The recoil kinetic energy distributions for both C-Cl fission and HCl elimination are bimodal. The former suggests that some of the radicals are formed in an excited electronic state. A portion of the CH(3)C(O)CHCl photoproducts undergo secondary dissociation to give CH(3) + C(O)CHCl. Photoelimination of Cl(2) is not a significant product channel. A primary C-C bond fission channel to give CH(3)CO + CHCl(2) may be present, but this signal may also be due to a secondary dissociation. Data from photofragment translational spectroscopy with electron impact and photoionization detection, velocity map ion imaging, and UV-visible absorption spectroscopy are presented, along with G3//B3LYP calculations of the bond dissociation energetics.
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Affiliation(s)
- Maria J Krisch
- The James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, USA
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28
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Fan H, Pratt ST. The stability of allyl radicals following the photodissociation of allyl iodide at 193 nm. J Chem Phys 2007; 125:144302. [PMID: 17042585 DOI: 10.1063/1.2352733] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The photodissociation of allyl iodide (C3H5I) at 193 nm was investigated by using a combination of vacuum-ultraviolet photoionization of the allyl radical, resonant multiphoton ionization of the iodine atoms, and velocity map imaging. The data provide insight into the primary C-I bond fission process and into the dissociative ionization of the allyl radical to produce C3H3+. The experimental results are consistent with the earlier results of Szpunar et al. [J. Chem. Phys. 119, 5078 (2003)], in that some allyl radicals with internal energies higher than the secondary dissociation barrier are found to be stable. This stability results from the partitioning of available energy between the rotational and vibrational degrees of freedom of the radical, the effects of a centrifugal barrier along the reaction coordinate, and the effects of the kinetic shift in the secondary dissociation of the allyl radical. The present results suggest that the primary dissociation of allyl iodide to allyl radicals plus I*(2P(1/2)) is more important than previously suspected.
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Affiliation(s)
- H Fan
- Argonne National Laboratory, Argonne, Illinois 60439, USA
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29
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Fan H, Pratt ST. Determination of spin-orbit branching fractions in the photodissociation of halogenated hydrocarbons. J Phys Chem A 2007; 111:3901-6. [PMID: 17253670 DOI: 10.1021/jp0670034] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two methods based on vacuum ultraviolet (vuv) photoionization are presented for the determination of the spin-orbit branching fractions of the halogen atom produced in the photodissociation of halogenated hydrocarbons. Both methods make use of differences in the photoionization cross sections of the 2P(3/2) ground state and the 2P(1/2) excited-state of the neutral halogen atom. In the first approach, measurements of the total photoionization signal of the halogen atom are made at several vuv wavelengths, and the difference in the wavelength dependences for the 2P(3/2) and 2P(1/2) atoms allows the extraction of the branching fractions. In the second approach, the vuv wavelength is set close to the ionization threshold of the 2P(3/2) atom (well above that of the 2P(1/2) atom), and measurements are made at several electric field strengths, which shift the ionization threshold and thus vary the photoionization cross sections. In both methods, the relative cross sections of the ground- and excited-state atoms are determined by using the known branching fractions for the 266 nm photodissociation of methyl iodide. These methods are applied to the photodissociation of isopropyl iodide and allyl iodide, two systems for which standard ion-imaging techniques do not provide unique branching fractions.
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Affiliation(s)
- H Fan
- Argonne National Laboratory, Argonne, Illinois 60439, USA
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30
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McCunn LR, FitzPatrick BL, Krisch MJ, Butler LJ, Liang CW, Lin JJ. Unimolecular dissociation of the propargyl radical intermediate of the CH+C2H2 and C+C2H3 reactions. J Chem Phys 2006; 125:133306. [PMID: 17029459 DOI: 10.1063/1.2353821] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
This paper examines the unimolecular dissociation of propargyl (HCCCH2) radicals over a range of internal energies to probe the CH+HCCH and C+C2H3 bimolecular reactions from the radical intermediate to products. The propargyl radical was produced by 157 nm photolysis of propargyl chloride in crossed laser-molecular beam scattering experiments. The H-loss and H2 elimination channels of the nascent propargyl radicals were observed. Detection of stable propargyl radicals gave an experimental determination of 71.5 (+5-10) kcal/mol as the lowest barrier to dissociation of the radical. This barrier is significantly lower than predictions for the lowest barrier to the radical's dissociation and also lower than calculated overall reaction enthalpies. Products from both H2+HCCC and H+C3H2 channels were detected at energies lower than what has been theoretically predicted. An HCl elimination channel and a minor C-H fission channel were also observed in the photolysis of propargyl chloride.
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Affiliation(s)
- Laura R McCunn
- The James Franck Institute and Department of Chemistry, University of Chicago, Chicago, Illinois 60637, USA
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31
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Fan H, Pratt ST. Photodissociation of propargyl bromide and photoionization of the propargyl radical. J Chem Phys 2006; 124:144313. [PMID: 16626202 DOI: 10.1063/1.2187975] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Velocity map imaging was used to study the 193 nm photodissociation of propargyl bromide C(3)H(3)Br as well as the photoionization dynamics of the resulting propargyl radical C(3)H(3). Images were recorded by using single-photon vacuum ultraviolet ionization of the propargyl radical and by using two-photon resonant, three-photon ionization of the ground state Br((2)P(32)) and spin-orbit excited Br(*)((2)P(12)) atoms. Analysis of these data allowed the determination of the branching ratio Br:Br(*) as well as the photofragment angular distributions. Images of C(3)H(3) produced by the photodissociation of both C(3)H(3)Br and C(3)H(3)Cl were recorded at several energies between 8.97 and 9.12 eV, as well as at 9.86 eV, and showed no obvious internal energy dependence of the relative photoionization cross sections.
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Affiliation(s)
- H Fan
- Argonne National Laboratory, Argonne, Illinois 60439, USA
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