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Gill WA, Aziz MT, Darwish HW, Janjua MRSA. Exploring HCl-HCl interactions: QZVPP calculations, improved Lennard-Jones potential, and second virial coefficient analysis for thermodynamics and industrial applications. RSC Adv 2024; 14:1890-1901. [PMID: 38192328 PMCID: PMC10772863 DOI: 10.1039/d3ra04387h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 12/13/2023] [Indexed: 01/10/2024] Open
Abstract
In this paper, we present a comprehensive analysis of HCl-HCl interactions, including QZVPP calculations, energy fitting, conformation validation, and the determination of the second virial coefficient B using improved Lennard-Jones (ILJ) potential parameters. To acquire accurate interaction energies, initial QZVPP calculations are performed on approximately 1851 randomly generated HCl-HCl conformations. Then, these energies are used to fit an improved Lennard-Jones potential energy surface, allowing for a robust description of HCl-HCl interactions. The ILJ potential parameters are then used to validate particular HCl dimer conformations, ensuring their stability and consistency with experimental observations. The correlation between calculated and experimental conformations strengthens the validity of the ILJ potential parameters. In addition, the second viral coefficient B is calculated at various temperatures using the ILJ potential. The obtained B values are compared to experimental data, demonstrating close agreement, and validating the ILJ potential's ability to accurately capture the intermolecular interactions and gas-phase behavior of the HCl-HCl system. The results of this study demonstrate the effective implementation of QZVPP calculations, energy fitting, and ILJ potential parameters in validating HCl-HCl conformations and accurately determining the second virial coefficient B. The high degree of concordance between calculated B values and experimental data demonstrates the validity of the ILJ potential and its suitability for modeling HCl-HCl interactions. This research contributes to a greater comprehension of HCl-HCl interactions and their implications for numerous chemical and atmospheric processes. The validated conformations, energy fitting method, and calculated second virial coefficients provide valuable instruments for future research and pave the way for more accurate modeling and simulations of HCl-HCl systems.
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Affiliation(s)
- Waqas Amber Gill
- Departamento de Química Física, Universidad de Valencia Avda Dr Moliner, 50, Burjassot E-46100 Valencia Spain
| | - Muhammad Tariq Aziz
- Department of Chemistry, Government College University Faisalabad Faisalabad 38000 Pakistan
| | - Hany W Darwish
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University P.O. Box 2457 Riyadh 11451 Saudi Arabia
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Anderson DT, Fajardo ME, Lindsay CM. High resolution infrared spectroscopy of (HCl) 2 and (DCl) 2 isolated in solid parahydrogen: Interchange-tunneling in a quantum solid. J Chem Phys 2021; 154:164309. [PMID: 33940830 DOI: 10.1063/5.0049599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Infrared spectroscopic studies of weakly bound clusters isolated in solid parahydrogen (pH2) that exhibit large-amplitude tunneling motions are needed to probe how quantum solvation perturbs these types of coherent dynamics. We report high resolution Fourier transform infrared absorption spectra of (HCl)2, HCl-DCl, and (DCl)2 isolated in solid pH2 in the 2.4-4.8 K temperature range. The (HCl)2 spectra show a remarkable amount of fine structures that can be rigorously assigned to vibration-rotation-tunneling transitions of (HCl)2 trapped in double substitution sites in the pH2 matrix where end-over-end rotation of the cluster is quenched. The spectra are assigned using a combination of isotopically (H/D and 35Cl/37Cl) enriched samples, polarized IR absorption measurements, and four-line combination differences. The interchange-tunneling (IT) splitting in the ground vibrational state for in-plane and out-of-plane H35Cl-H37Cl dimers is 6.026(1) and 6.950(1) cm-1, respectively, which are factors of 2.565 and 2.224 smaller than in the gas phase dimer. In contrast, the (DCl)2 results show larger perturbations where the ground vibrational state IT splitting in D35Cl-D37Cl is 1.141(1) cm-1, which is a factor of 5.223 smaller than in the gas phase, and the tunneling motion is quenched in excited intramolecular vibrational states. The results are compared to similar measurements on (HCl)2 made in liquid helium nanodroplets to illustrate the similarities and differences in how both these quantum solvents interact with large amplitude tunneling motions of an embedded chromophore.
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Affiliation(s)
- David T Anderson
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, USA
| | - Mario E Fajardo
- Air Force Research Laboratory, Munitions Directorate, 2306 Perimeter Rd., Eglin AFB, Florida 32542-5910, USA
| | - C Michael Lindsay
- Air Force Research Laboratory, Munitions Directorate, 2306 Perimeter Rd., Eglin AFB, Florida 32542-5910, USA
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Strom AI, Gutiérrez-Quintanilla A, Chevalier M, Ceponkus J, Crépin C, Anderson DT. Matrix Isolation Spectroscopy and Nuclear Spin Conversion of Propyne Suspended in Solid Parahydrogen. J Phys Chem A 2020; 124:4471-4483. [PMID: 32401028 DOI: 10.1021/acs.jpca.0c02900] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Parahydrogen (pH2) quantum solids are excellent matrix isolation hosts for studying the rovibrational dynamics and nuclear spin conversion (NSC) kinetics of molecules containing indistinguishable nuclei with nonzero spin. The relatively slow NSC kinetics of propyne (CH3CCH) isolated in solid pH2 is employed as a tool to assign the rovibrational spectrum of propyne in the 600-7000 cm-1 region. Detailed analyses of a variety of parallel (ΔK = 0) and perpendicular (ΔK=±1) bands of propyne indicate that the end-over-end rotation of propyne is quenched, but K rotation of the methyl group around the C3 symmetry axis still persists. However, this single-axis K rotation is significantly hindered for propyne trapped in solid pH2 such that the energies of the K rotational states do not obey simple energy-level expressions. The NSC kinetics of propyne follows first-order reversible kinetics with a 287(7) min effective time constant at 1.7 K. Intensity-intensity correlation plots are used to determine the relative line strengths of individual ortho- and para-propyne rovibrational transitions, enabling an independent estimation of the ground vibrational state effective A″ constant of propyne.
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Affiliation(s)
- A I Strom
- Department of Chemistry, University of Wyoming, Laramie 82071-3838, Wyoming, United States
| | - A Gutiérrez-Quintanilla
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, Orsay 91405, France.,Instituto Superior de Tecnologías y Ciencias Aplicadas, Universidad de La Habana, Ave. Salvador Allende No. 1110, Quinta de los Molinos 10400, La Habana, Cuba
| | - M Chevalier
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, Orsay 91405, France
| | - J Ceponkus
- Institute of Chemical Physics, Vilnius University, Sauletekio ave. 9 III, Vilnius LT-10222, Lithuania
| | - C Crépin
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, Orsay 91405, France
| | - D T Anderson
- Department of Chemistry, University of Wyoming, Laramie 82071-3838, Wyoming, United States
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Fajardo ME. Quantitative Absorption Spectroscopy of Aluminum Atoms in Cryogenic Parahydrogen Solids. J Phys Chem A 2019; 123:10893-10905. [PMID: 31769687 DOI: 10.1021/acs.jpca.9b09318] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report results of quantitative ultraviolet (UV) and infrared (IR) absorption spectroscopy experiments on Al-atom-doped cryogenic parahydrogen (pH2) solids produced by codeposition of Al vapor and pH2 gas. For Al-atom concentrations [Al] ≲200 parts-per-million (ppm), the Al/pH2 solids are optically transparent and primarily contain isolated Al atoms, with a small admixture of AlH, Al2H2, and Al2H4 molecules formed by UV irradiation and Al-atom recombination/reaction. We assign the Al/pH2 UV absorption spectrum by invoking a large (≈0.6 eV) gas-to-matrix blue shift to accompany the increase in principal quantum number in the 4s 2S ← 3p 2P1/2 transition, as previously discussed for boron-atom-doped pH2 solids. We assign a series of sharp features observed in the 4140-4155 cm-1 IR region to Al-atom-induced Q1(0) and Q1(1) absorptions of the pH2 solid. We use the solid pH2 Q1(0) + S0(0) absorption to determine the sample thickness and to establish a constant pH2 deposition efficiency independent of the flow rate. Using all of these absorption features in concert, we show that the Al-atom flux delivered by the effusive source is well described by the Knudsen-Langmuir equation, calculate an absolute Al-atom deposition yield per mass of aluminum evaporated, and demonstrate both constant Al-atom deposition and isolation efficiencies for [Al] ≲200 ppm. We discuss this unexpected constant Al-atom isolation efficiency in detail and speculate that it indicates nonuniform Al-atom recombination/reaction on the surface of the accreting sample, perhaps dominated by processes occurring near pH2 crystallite grain boundaries. We demonstrate "control" over the deposition process, which we define as the ability to set, achieve, and verify "targets" for the final Al-atom concentrations and pH2 solid thicknesses. This ability is key to sorting out the very different phenomena observed in samples targeting [Al] ≳300 ppm, which are described in the immediately following companion manuscript.
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Affiliation(s)
- Mario E Fajardo
- Munitions Directorate, Ordnance Division, Energetic Materials Branch, AFRL/RWME , Air Force Research Laboratory , 2306 Perimeter Road , Eglin AFB , Florida 32542-5910 , United States
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Das P, Lee YP. Bimolecular reaction of CH3 + CO in solid p-H2: Infrared absorption of acetyl radical (CH3CO) and CH3-CO complex. J Chem Phys 2014; 140:244303. [DOI: 10.1063/1.4883519] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Prasanta Das
- Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Yuan-Pern Lee
- Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
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Ruzi M, Anderson DT. Fourier Transform Infrared Studies of Ammonia Photochemistry in Solid Parahydrogen. J Phys Chem A 2013; 117:13832-42. [DOI: 10.1021/jp408336n] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mahmut Ruzi
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, United States
| | - David T. Anderson
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, United States
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Raston PL, Kettwich SC, Anderson DT. High-resolution infrared spectroscopy of atomic bromine in solid parahydrogen and orthodeuterium. J Chem Phys 2013; 139:134304. [PMID: 24116565 DOI: 10.1063/1.4820528] [Citation(s) in RCA: 10] [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 work extends our earlier investigation of the near-infrared absorption spectroscopy of atomic bromine (Br) trapped in solid parahydrogen (pH2) and orthodeuterium (oD2) [S. C. Kettwich, L. O. Paulson, P. L. Raston, and D. T. Anderson, J. Phys. Chem. A 112, 11153 (2008)]. We report new spectroscopic observations on a series of double transitions involving excitation of the weak Br-atom spin-orbit (SO) transition ((2)P(1/2) ← (2)P(3/2)) in concert with phonon, rotational, vibrational, and rovibrational excitation of the solid molecular hydrogen host. Further, we utilize the rapid vapor deposition technique to produce pH2 crystals with a non-equilibrium mixture of face centered cubic (fcc) and hexagonal closed packed (hcp) crystal domains in the freshly deposited solid. Gentle annealing (T = 4.3 K) of the pH2 sample irreversibly converts the higher energy fcc crystal domains to the slightly more stable hcp structure. We follow the extent of this conversion process using the intensity of the U1(0) transition of solid pH2 and correlate crystal structure changes with changes in the integrated intensity of Br-atom absorption features. Annealing the pH2 solid causes the integrated intensity of the zero-phonon Br SO transition to increase approximately 45% to a value that is 8 times larger than the gas phase value. We show that the magnitude of the increase is strongly correlated to the fraction of hcp crystal domains within the solid. Theoretical calculations presented in Paper II show that these intensity differences are caused by the different symmetries of single substitution sites for these two crystal structures. For fully annealed Br-atom doped pH2 solids, where the crystal structure is nearly pure hcp, the Br-atom SO transition sharpens considerably and shows evidence for resolved hyperfine structure.
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Affiliation(s)
- Paul L Raston
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, USA
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Ruzi M, Anderson DT. Matrix isolation spectroscopy and nuclear spin conversion of NH3 and ND3 in solid parahydrogen. J Phys Chem A 2013; 117:9712-24. [PMID: 23594210 DOI: 10.1021/jp3123727] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present matrix isolation infrared absorption spectra of NH3 and ND3 trapped in solid parahydrogen (pH2) at temperatures around 1.8 K. We used the relatively slow nuclear spin conversion (NSC) of NH3 and ND3 in freshly deposited pH2 samples as a tool to assign the sparse vibration-inversion-rotation (VIR) spectra of NH3 in the regions of the ν2, ν4, 2ν4, ν1, and ν3 bands and ND3 in the regions of the ν2, ν4, ν1, and ν3 fundamentals. Partial assignments are also presented for various combination bands of NH3. Detailed analysis of the ν2 bands of NH3 and ND3 indicates that both isotopomers are nearly free rotors; that the vibrational energy is blue-shifted by 1-2%; and that the rotational constants and inversion tunneling splitting are 91-94% and 67-75%, respectively, of the gas-phase values. The line shapes of the VIR absorptions are narrow (0.2-0.4 cm(-1)) for upper states that cannot rotationally relax and broad (>1 cm(-1)) for upper states that can rotationally relax. We report and assign a number of NH3-induced infrared absorption features of the pH2 host near 4150 cm(-1), along with a cooperative transition that involves simultaneous vibrational excitation of a pH2 molecule and rotation-inversion excitation of NH3. The NSCs of NH3 and ND3 were found to follow first-order kinetics with rate constants at 1.8 K of k = 1.88(16) × 10(-3) s(-1) and k = 1.08(8) × 10(-3) s(-1), respectively. These measured rate constants are compared to previous measurements for NH3 in an Ar matrix and with the rate constants measured for other dopant molecules isolated in solid pH2.
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Affiliation(s)
- Mahmut Ruzi
- Department of Chemistry, University of Wyoming , Laramie, Wyoming 82071, United States
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Golec B, Das P, Bahou M, Lee YP. Infrared Spectra of the 1-Pyridinium (C5H5NH+) Cation and Pyridinyl (C5H5NH and 4-C5H6N) Radicals Isolated in Solid para-Hydrogen. J Phys Chem A 2013; 117:13680-90. [DOI: 10.1021/jp407668z] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Barbara Golec
- Department
of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Prasanta Das
- Department
of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Mohammed Bahou
- Department
of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Yuan-Pern Lee
- Department
of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan
- Institute
of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
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Sacramento RL, Alves BX, Almeida DT, Wolff W, Li MS, Cesar CL. Source of slow lithium atoms from Ne or H2matrix isolation sublimation. J Chem Phys 2012; 136:154202. [DOI: 10.1063/1.4704125] [Citation(s) in RCA: 7] [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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11
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Lee YF, Kong LJ, Lee YP. Infrared absorption of CH3OSO and CD3OSO radicals produced upon photolysis of CH3OS(O)Cl and CD3OS(O)Cl in p-H2 matrices. J Chem Phys 2012; 136:124510. [DOI: 10.1063/1.3696894] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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12
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Amicangelo JC, Golec B, Bahou M, Lee YP. Infrared spectrum of the 2-chloroethyl radical in solid para-hydrogen. Phys Chem Chem Phys 2012; 14:1014-29. [DOI: 10.1039/c1cp22524c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Miyamoto Y, Ooe H, Kuma S, Kawaguchi K, Nakajima K, Nakano I, Sasao N, Tang J, Taniguchi T, Yoshimura M. Spectroscopy of HF and HF-Containing Clusters in Solid Parahydrogen. J Phys Chem A 2011; 115:14254-61. [DOI: 10.1021/jp207419m] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuki Miyamoto
- Graduate School of Natural Science and Technology, Okayama University, Tsushima-naka 3-1-1 Kita-ku Okayama 700-8530, Japan
| | - Hiroki Ooe
- Graduate School of Natural Science and Technology, Okayama University, Tsushima-naka 3-1-1 Kita-ku Okayama 700-8530, Japan
| | - Susumu Kuma
- Research Core for Extreme Quantum World, Okayama University, Tsushima-naka 3-1-1 Kita-ku Okayama 700-8530, Japan
| | - Kentarou Kawaguchi
- Graduate School of Natural Science and Technology, Okayama University, Tsushima-naka 3-1-1 Kita-ku Okayama 700-8530, Japan
| | - Kyo Nakajima
- Research Core for Extreme Quantum World, Okayama University, Tsushima-naka 3-1-1 Kita-ku Okayama 700-8530, Japan
| | - Itsuo Nakano
- Faculty of Science, Okayama University, Tsushima-naka 3-1-1 Kita-ku Okayama 700-8530, Japan
| | - Noboru Sasao
- Research Core for Extreme Quantum World, Okayama University, Tsushima-naka 3-1-1 Kita-ku Okayama 700-8530, Japan
| | - Jian Tang
- Graduate School of Natural Science and Technology, Okayama University, Tsushima-naka 3-1-1 Kita-ku Okayama 700-8530, Japan
| | - Takashi Taniguchi
- Research Core for Extreme Quantum World, Okayama University, Tsushima-naka 3-1-1 Kita-ku Okayama 700-8530, Japan
| | - Motohiko Yoshimura
- Faculty of Science, Okayama University, Tsushima-naka 3-1-1 Kita-ku Okayama 700-8530, Japan
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Paulson LO, Anderson DT. Infrared Spectroscopy of the Amide I Mode of N-Methylacetamide in Solid Hydrogen at 2–4 K. J Phys Chem B 2011; 115:13659-67. [DOI: 10.1021/jp204800c] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Leif O. Paulson
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071-3838, United States
| | - David T. Anderson
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071-3838, United States
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Paulson LO, Anderson DT, Lundell J, Marushkevich K, Melavuori M, Khriachtchev L. Conformation Resolved Induced Infrared Activity: trans- and cis-Formic Acid Isolated in Solid Molecular Hydrogen. J Phys Chem A 2011; 115:13346-55. [DOI: 10.1021/jp204600v] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Leif O. Paulson
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, United States
| | - David T. Anderson
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, United States
| | - Jan Lundell
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, FIN-40014 Jyväskylä, Finland
| | | | - Mia Melavuori
- Department of Chemistry, P.O. Box 55, FIN-00014 University of Helsinki, Finland
| | - Leonid Khriachtchev
- Department of Chemistry, P.O. Box 55, FIN-00014 University of Helsinki, Finland
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Fajardo M. Matrix Isolation Spectroscopy in Solid Parahydrogen. PHYSICS AND CHEMISTRY AT LOW TEMPERATURES 2011:167-202. [DOI: 10.1201/b11403-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Du JH, Wan L, Wu L, Xu G, Deng WP, Liu AW, Chen Y, Hu SM. CO2 in Solid Para-Hydrogen: Spectral Splitting and the CO2···(o-H2)n Clusters. J Phys Chem A 2011; 115:1040-6. [DOI: 10.1021/jp108769n] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jun-He Du
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026 China
| | - Lei Wan
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026 China
| | - Lei Wu
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026 China
| | - Gang Xu
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026 China
| | - Wen-Ping Deng
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026 China
| | - An-Wen Liu
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026 China
| | - Yang Chen
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026 China
| | - Shui-Ming Hu
- Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026 China
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Ceponkus J, Uvdal P, Nelander B. Rotation of Water in Solid Parahydrogen and Orthodeuterium. J Phys Chem A 2010; 114:12979-85. [DOI: 10.1021/jp105303z] [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)
- J. Ceponkus
- Max-Lab and Department of Chemical Physics, Chemical Center, Lund University, S-22100 Lund, Sweden
| | - P. Uvdal
- Max-Lab and Department of Chemical Physics, Chemical Center, Lund University, S-22100 Lund, Sweden
| | - B. Nelander
- Max-Lab and Department of Chemical Physics, Chemical Center, Lund University, S-22100 Lund, Sweden
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Toda N, Mizoguchi A, Kanamori H. Spectral line shape profile of rovibrational transitions of CO embedded in p-H2 crystals studied by high resolution IR diode laser spectroscopy. J Chem Phys 2010; 132:234504. [PMID: 20572718 DOI: 10.1063/1.3429252] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Line profiles of rovibrational transitions of CO embedded in p-H(2) crystals were studied by high resolution midinfrared diode laser spectroscopy. The line profile analysis for the R(0)(parallel), R(0)(perpendicular), P(1)(parallel), and P(1)(perpendicular) transitions shows that spectral line shapes are well reproduced by a convolution of Gaussian and Lorentzian functions. The temperature dependence of the Lorentzian Gamma(L)(T) and Gaussian widths Gamma(G)(T) shows that there is a nonzero linewidth contribution to each at the T = 0 K limit. The main part of the Lorentzian width Gamma(L)(T = 0) shows anisotropy in the hcp structure and is explained by spontaneous decay of the rotational excited state energy to phonon modes. A smaller part of Gamma(L)(T = 0) is attributed to inhomogeneous broadening due to the point defects of other CO molecules in the crystal. On the other hand, the Gaussian width Gamma(G)(T = 0) is explained by inhomogeneous broadening due to dislocations. In the T > 0 region, Gamma(L)(T) shows strong temperature dependence but Gamma(G)(T) does not. The center frequencies of the R(0)(perpendicular) and P(1)(parallel) transitions show blueshifts and those of the R(0)(parallel) and P(1)(perpendicular) transitions show redshifts with increasing temperature. This phenomenon is explained by a decrease in the anisotropy in the crystal field, which is caused by the averaging of thermal lattice fluctuations. Furthermore, the contribution of vibration and rotation to the linewidth is discussed.
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Affiliation(s)
- Naoya Toda
- Department of Physics, Tokyo Institute of Technology, Ohokayama 2-12-1, Meguro-ku, Tokyo 152-8551, Japan
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Raston PL, Xu Y, Jäger W, Potapov AV, Surin LA, Dumesh BS, Schlemmer S. Rotational study of carbon monoxide isotopologues in small 4He clusters. Phys Chem Chem Phys 2010; 12:8260-7. [DOI: 10.1039/c0cp00193g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kettwich SC, Raston PL, Anderson DT. The Cl + H2 → HCl + H Reaction Induced by IR + UV Irradiation of Cl2 in Solid para-H2: Experiment. J Phys Chem A 2009; 113:7621-9. [DOI: 10.1021/jp811206a] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sharon C. Kettwich
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, and Institut für Experimentalphysik, Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, D-14195, Berlin, Germany
| | - Paul L. Raston
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, and Institut für Experimentalphysik, Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, D-14195, Berlin, Germany
| | - David T. Anderson
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, and Institut für Experimentalphysik, Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, D-14195, Berlin, Germany
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FTIR study of nuclear spin conversion of solid normal hydrogen at 4.2K, doped with H2O, CH3F, CH4 and double doped with O2. Evidence of ortho-H2 catalyzed conversion by CH3F. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.01.047] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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23
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Paulson LO, Anderson DT. High-Resolution Vibrational Spectroscopy of trans-Formic Acid in Solid Parahydrogen. J Phys Chem A 2009; 113:1770-8. [DOI: 10.1021/jp8100255] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Leif O. Paulson
- Department of Chemistry, University of Wyoming, Laramie, Wyoming, 82071
| | - David T. Anderson
- Department of Chemistry, University of Wyoming, Laramie, Wyoming, 82071
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24
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Abouaf-Marguin L, Vasserot AM, Pardanaud C. Simulation of the time dependent infrared ν2 mode absorptions of (oH2)n:H2O clusters in O2 doped solid hydrogen at 4.2K. J Chem Phys 2009; 130:054503. [DOI: 10.1063/1.3068413] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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25
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Kettwich SC, Paulson LO, Raston PL, Anderson DT. Photodissociation of Molecular Bromine in Solid H2 and D2: Spectroscopy of the Atomic Bromine Spin−Orbit Transition. J Phys Chem A 2008; 112:11153-8. [DOI: 10.1021/jp8029314] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Leif O. Paulson
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071
| | - Paul L. Raston
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071
| | - David T. Anderson
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071
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26
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Nuclear spin conversion of O2 doped solid normal H2 at 4.2K: An empirical law to determine the ortho-H2 concentration by infrared absorption spectroscopy. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.04.133] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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27
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Miyamoto Y, Fushitani M, Ando D, Momose T. Nuclear spin conversion of methane in solid parahydrogen. J Chem Phys 2008; 128:114502. [PMID: 18361586 DOI: 10.1063/1.2889002] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The nuclear spin conversion of CH(4) and CD(4) isolated in solid parahydrogen was investigated by high resolution Fourier transform infrared spectroscopy. From the analysis of the temporal changes of rovibrational absorption spectra, the nuclear spin conversion rates associated with the rotational relaxation from the J=1 state to the J=0 state for both species were determined at temperatures between 1 and 6 K. The conversion rate of CD(4) was found to be 2-100 times faster than that of CH(4) in this temperature range. The faster conversion in CD(4) is attributed to the quadrupole interaction of D atoms in CD(4), while the conversion in CH(4) takes place mainly through the nuclear spin-nuclear spin interaction. The conversion rates depend on crystal temperature strongly above 3.5 K for CH(4) and above 2 K for CD(4), while the rates were almost constant below these temperatures. The temperature dependence indicates that the one-phonon process is dominant at low temperatures, while two-phonon processes become important at higher temperatures as a cause of the nuclear spin conversion.
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Affiliation(s)
- Yuki Miyamoto
- Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto, Japan
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28
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Abouaf-Marguin L, Vasserot AM, Pardanaud C, Stienlet J, Michaut X. Time evolution of the ν2 IR absorption of (o-H2)n:H2O clusters (n=11–1), and increase of H2O rotation, in O2 doped solid hydrogen at 4.2K. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.01.081] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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29
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Kettwich SC, Pinelo LF, Anderson DT. Synthesis and infrared characterization of Br–HBr and Br–DBr entrance channel complexes in solid parahydrogen. Phys Chem Chem Phys 2008; 10:5564-73. [DOI: 10.1039/b806276e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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30
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Skvortsov D, Choi MY, Vilesov AF. Study of HCl Clusters in Helium Nanodroplets: Experiments and ab Initio Calculations as Stepping Stones from Gas Phase to Bulk. J Phys Chem A 2007; 111:12711-6. [DOI: 10.1021/jp076123o] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dmitry Skvortsov
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, and Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 660-701, South Korea
| | - Myong Yong Choi
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, and Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 660-701, South Korea
| | - Andrey F. Vilesov
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, and Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 660-701, South Korea
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31
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Fushitani M, Miyamoto Y, Hoshina H, Momose T. In Situ Photolysis of CD3I in Solid Orthodeuterium. J Phys Chem A 2007; 111:12629-34. [DOI: 10.1021/jp0761113] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mizuho Fushitani
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, and Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver BC, V6T1Z1, Canada
| | - Yuki Miyamoto
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, and Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver BC, V6T1Z1, Canada
| | - Hiromichi Hoshina
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, and Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver BC, V6T1Z1, Canada
| | - Takamasa Momose
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, and Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver BC, V6T1Z1, Canada
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32
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Wang X, Andrews L. Infrared Spectra and Theoretical Calculations of Lithium Hydride Clusters in Solid Hydrogen, Neon, and Argon. J Phys Chem A 2007; 111:6008-19. [PMID: 17547379 DOI: 10.1021/jp071251y] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A matrix isolation IR study of laser-ablated lithium atom reactions with H2 has been performed in solid para-hydrogen, normal hydrogen, neon, and argon. The LiH molecule and (LiH)(2,3,4) clusters were identified by IR spectra with isotopic substitution (HD, D(2), and H(2) + D(2)) and comparison to frequencies calculated by density functional theory and the MP2 method. The LiH diatomic molecule is highly polarized and associates additional H(2) to form primary (H(2))(2)LiH chemical complexes surrounded by a physical cage of solid hydrogen where the ortho and para spin states form three different primary complexes and play a role in the identification of the bis-dihydrogen complex and in characterization of the matrix cage. The highly ionic rhombic (LiH)(2) dimer, which is trapped in solid matrices, is calculated to be 22 kcal/mol more stable than the inverse hydrogen bonded linear LiH-LiH dimer, which is not observed here. The cyclic lithium hydride trimer and tetramer clusters were also observed. Although the spontaneous reaction of 2 Li and H(2) to form (LiH)(2) occurs on annealing in solid H(2), the formation of higher clusters requires visible irradiation. We observed the simplest possible chemical reduction of dihydrogen using two lithium valence electrons to form the rhombic (LiH)(2) dimer.
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Affiliation(s)
- Xuefeng Wang
- Department of Chemistry, P.O. Box 400319, University of Virginia, Charlottesville, Virginia 22904-4319, USA
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33
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Gühr M, Bargheer M, Fushitani M, Kiljunen T, Schwentner N. Ultrafast dynamics of halogens in rare gas solids. Phys Chem Chem Phys 2007; 9:779-801. [PMID: 17287873 DOI: 10.1039/b609058n] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We perform time resolved pump-probe spectroscopy on small halogen molecules ClF, Cl2, Br2, and I2 embedded in rare gas solids (RGS). We find that dissociation, angular depolarization, and the decoherence of the molecule is strongly influenced by the cage structure. The well ordered crystalline environment facilitates the modelling of the experimental angular distribution of the molecular axis after the collision with the rare gas cage. The observation of many subsequent vibrational wave packet oscillations allows the construction of anharmonic potentials and indicate a long vibrational coherence time. We control the vibrational wave packet revivals, thereby gaining information about the vibrational decoherence. The coherence times are remarkable larger when compared to the liquid or high pressure gas phase. This fact is attributed to the highly symmetric molecular environment of the RGS. The decoherence and energy relaxation data agree well with a perturbative model for moderate vibrational excitation and follow a classical model in the strong excitation limit. Furthermore, a wave packet interferometry scheme is applied to deduce electronic coherence times. The positions of those cage atoms, excited by the molecular electronic transitions are modulated by long living coherent phonons of the RGS, which we can probe via the molecular charge transfer states.
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Affiliation(s)
- M Gühr
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195, Berlin, Germany
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34
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Yoshioka† K, Raston PL, Anderson DT. Infrared spectroscopy of chemically doped solid parahydrogen. INT REV PHYS CHEM 2006. [DOI: 10.1080/01442350600802766] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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35
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36
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Stiles PL, Miller RE. High-Resolution Infrared Spectroscopy of HCN−Znn (n = 1−4) Clusters: Structure Determination and Comparisons with Theory. J Phys Chem A 2006; 110:5620-8. [PMID: 16640355 DOI: 10.1021/jp060042v] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
High-resolution infrared laser spectroscopy has been used to obtain rotationally resolved spectra of HCN-Zn(n) (n = 1-4) complexes formed in helium nanodroplets. In the present study the droplets passed through a metal oven, where the zinc vapor pressure was adjusted until one or more atoms were captured by the droplets. A second pickup cell was then used to dope the droplets with a single HCN molecule. Rotationally resolved infrared spectra are obtained for all of these complexes, providing valuable information concerning their structures. Stark spectra are reported and used to determine the corresponding permanent electric dipole moments. Ab initio calculations are also reported for these complexes for comparison with the experimental results.
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Affiliation(s)
- Paul L Stiles
- Department of Chemistry, University of North Carolina, Chapel Hill, 27599, USA.
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37
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Raston PL, Anderson DT. Infrared-induced reaction of Cl atoms trapped in solid parahydrogen. Phys Chem Chem Phys 2006; 8:3124-9. [PMID: 16804614 DOI: 10.1039/b604448d] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The 355 nm photodissociation of Cl(2) trapped in a solid parahydrogen matrix at 2 K leads to the formation of isolated Cl photofragments. At these low temperatures (k(B)T approximately 1.4 cm(-1)), the Cl atoms can not react with the parahydrogen matrix since the reaction Cl + H(2)(v = 0, j = 0) --> HCl(v = 0, j = 0) + H is endothermic by 360 cm(-1). Irradiation of the Cl atom doped parahydrogen solid with broadband infrared radiation from 4000 cm(-1) to 5000 cm(-1) induces reaction of atomic Cl with the parahydrogen matrix to form HCl. The infrared-induced chemistry is attributed to solid parahydrogen absorptions that lead to the creation of vibrationally excited H(2)(v = 1), which supply the necessary energy to induce reaction. The kinetics of this low temperature infrared-induced reaction is studied using Fourier Transform infrared spectroscopy of the HCl reaction product. The HCl formation kinetics is first-order and the magnitude of the effective rate constant for the infrared-induced reaction depends on the properties of the near infrared radiation.
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Affiliation(s)
- Paul L Raston
- Department of Chemistry, University of Wyoming, Laramie, WY 82071-3838, USA
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38
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Tang J, McKellar ARW. Infrared spectra of seeded hydrogen clusters: (para-H2)N–N2O and (ortho-H2)N–N2O, N=2–13. J Chem Phys 2005; 123:114314. [PMID: 16392566 DOI: 10.1063/1.2032989] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
High-resolution infrared spectra of clusters containing para-H2 and/or ortho-H2 and a single nitrous oxide molecule are studied in the 2225-cm(-1) region of the upsilon1 fundamental band of N2O. The clusters are formed in pulsed supersonic jet expansions from a cooled nozzle and probed using a tunable infrared diode laser spectrometer. The simple symmetric rotor-type spectra generally show no resolved K structure, with prominent Q-branch features for ortho-H2 but not para-H2 clusters. The observed vibrational shifts and rotational constants are reported. There is no obvious indication of superfluid effects for para-H2 clusters up to N=13. Sharp transitions due to even larger clusters are observed, but no definite assignments are possible. Mixed (para-H2)N-(ortho-H2)M-N2O cluster line positions can be well predicted by linear interpolation between the corresponding transitions of the pure clusters.
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Affiliation(s)
- Jian Tang
- Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario
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39
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40
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Moroni S, Botti M, De Palo S, McKellar ARW. Small para-hydrogen clusters doped with carbon monoxide: Quantum Monte Carlo simulations and observed infrared spectra. J Chem Phys 2005; 122:094314. [PMID: 15836135 DOI: 10.1063/1.1854633] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The structures and rotational dynamics of clusters of a single carbon monoxide molecule solvated in para-hydrogen, (paraH(2))(N)-CO, have been simulated for sizes up to N=17 using the reptation Monte Carlo technique. The calculations indicate the presence of two series of R(0) rotational transitions with J=1<--0 for cold clusters, similar to those predicted and observed in the case of He(N)-CO. Infrared spectra of these clusters have been observed in the region of the C-O stretch ( approximately 2143 cm(-1)) in a pulsed supersonic jet expansion using a tunable diode laser probe. With the help of the calculations, the observed R(0) rotational transitions have been assigned up to N=9 for the b-type series and N=14 for the a-type series. Theory and experiment agree rather well, except that theory tends to overestimate the b-type energies. The (paraH(2))(12)-CO cluster is calculated to be particularly stable and (relatively) rigid, corresponding to completion of the first solvation shell, and it is observed to have the strongest a-type transition.
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Affiliation(s)
- S Moroni
- SMC INFM, Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Rome, Italy
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41
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Tang J, McKellar ARW. Infrared spectra of seeded hydrogen clusters: (paraH2)N–OCS, (orthoH2)N–OCS, and (HD)N–OCS, N=2–7. J Chem Phys 2004; 121:3087-95. [PMID: 15291618 DOI: 10.1063/1.1774158] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Infrared spectra of hydrogen-carbonyl sulfide clusters containing paraH2, orthoH2, or HD have been studied in the 2060 cm(-1) region of the C-O stretching vibration. The clusters were formed in pulsed supersonic jet expansions and probed using a tunable infrared diode laser spectrometer. Simple symmetric rotor type spectra were observed and assigned for clusters containing up to N = 7 hydrogen molecules. There was no resolved K structure, and Q-branch features were present for orthoH2 and HD but absent for paraH2. These characteristics can be rationalized in terms of near symmetric rotor structures, very low effective rotational temperatures (0.15 to 0.6 K), and nuclear spin statistics. The observed vibrational shifts were compared with those from recent observations on the same clusters embedded in helium nanodroplets. The observed rotational constants for the paraH2 clusters are in good agreement with a recent quantum Monte Carlo simulation. Some mixed clusters were also observed, such as HD-HD-He-OCS and paraH2 - orthoH2 - OCS.
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Affiliation(s)
- J Tang
- Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario K1A 0R6
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42
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Fajardo ME, Tam S, DeRose ME. Matrix isolation spectroscopy of H2O, D2O, and HDO in solid parahydrogen. J Mol Struct 2004. [DOI: 10.1016/j.molstruc.2003.11.043] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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43
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Affiliation(s)
- Lester Andrews
- Department of Chemistry, P.O. Box 400319, University of Virginia, Charlottesville, Virginia 22904-4319
| | - Xuefeng Wang
- Department of Chemistry, P.O. Box 400319, University of Virginia, Charlottesville, Virginia 22904-4319
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44
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Hoshina H, Fushitani M, Momose T, Shida T. Tunneling chemical reactions in solid parahydrogen: Direct measurement of the rate constants of R+H2→RH+H (R=CD3,CD2H,CDH2,CH3) at 5 K. J Chem Phys 2004; 120:3706-15. [PMID: 15268533 DOI: 10.1063/1.1642582] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Tunneling chemical reactions between deuterated methyl radicals and the hydrogen molecule in a parahydrogen crystal have been studied by Fourier transform infrared spectroscopy. The tunneling rates of the reactions R + H2 --> RH + H (R = CD3,CD2H,CDH2) in the vibrational ground state were determined directly from the temporal change in the intensity of the rovibrational absorption bands of the reactants and products in each reaction in solid parahydrogen observed at 5 K. The tunneling rate of each reaction was found to differ definitely depending upon the degree of deuteration in the methyl radicals. The tunneling rates were determined to be 3.3 x 10(-6) s(-1), 2.0 x 10(-6) s(-1), and 1.0 x 10(-6) s(-1) for the systems of CD3, CD2H, and CDH2, respectively. Conversely, the tunneling reaction between a CH3 radical and the hydrogen molecule did not proceed within a week's time. The upper limit of the tunneling rate of the reaction of the CH3 radical was estimated to be 8 x 10(-8) s(-1).
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Affiliation(s)
- Hiromichi Hoshina
- Division of Chemistry, Graduate School of Science, Kyoto University, 606-8502, Japan
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45
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Moore DT, Miller RE. Rotationally Resolved Infrared Laser Spectroscopy of (H2)n-HF and (D2)n-HF (n = 2−6) in Helium Nanodroplets. J Phys Chem A 2004. [DOI: 10.1021/jp0310403] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- David T. Moore
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Roger E. Miller
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
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46
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Wu YJ, Yang X, Lee YP. Infrared matrix-isolation spectroscopy using pulsed deposition of p-H2. J Chem Phys 2004; 120:1168-71. [PMID: 15268239 DOI: 10.1063/1.1639151] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
We employed pulsed deposition of p-H2 onto a cold target to form a matrix sample suitable for measurements of infrared absorption. Unlike the method of rapid vapor deposition at approximately 2.5 K, developed by Fajardo et al., this method can be performed at a temperature as high as 5.5 K, achievable with a closed-cycle refrigerator; pumping on liquid helium in a cryostat is eliminated. Compared with the enclosed-cell method developed by Oka, Shida, Momose, and co-workers, this method is more versatile in sample preparation, especially for samples at a greater concentration or with high reactivity. Two experiments were tested: the pulse-deposited sample of CH4/p-H2 yields an infrared absorption spectrum nearly identical to that recorded with rapid vapor deposition, and a sample of vinyl chloride (C2H3Cl) in solid p-H2 irradiated with laser emission at 193 nm yields C2H5, in contrast to formation of HCl, C2H2, and a complex of HClC2H2 observed upon photolysis of C2H3Cl in an Ar matrix. These experiments are also compared with those with n-H2 or Ne as the matrix host.
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Affiliation(s)
- Yu-Jong Wu
- Department of Chemistry, National Tsing Hua University, 101, Sec. 2, Kuang Fu Road, Hsinchu 30013, Taiwan
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47
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Kumagai J, Hanabusa M, Inagaki H, Kariya S. Is the ESR spectrum attributable to H2–or H2+(H2)2? Precise measurement of the g-value and anisotropic hyperfine structure in γ-irradiated solid parahydrogen. Phys Chem Chem Phys 2004. [DOI: 10.1039/b402756f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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48
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Moore DT, Miller RE. Solvation of HF by Molecular Hydrogen: Helium Nanodroplet Vibrational Spectroscopy. J Phys Chem A 2003. [DOI: 10.1021/jp0306343] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- D. T. Moore
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - R. E. Miller
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
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49
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McLain SE, Siewenie JE, Benmore CJ, Turner JFC. On the structure of boron trifluoride in liquid and supercritical phase investigated with neutron diffraction. J Chem Phys 2003. [DOI: 10.1063/1.1604382] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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50
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Yoshioka K, Anderson DT. Infrared spectra of CH3F(ortho-H2)n clusters in solid parahydrogen. J Chem Phys 2003. [DOI: 10.1063/1.1595089] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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