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Sliter R, Hyeon-Deuk K, Vilesov AF. Phase Separation in Cold Para-H_{2} D_{2} Clusters. PHYSICAL REVIEW LETTERS 2024; 132:206001. [PMID: 38829090 DOI: 10.1103/physrevlett.132.206001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Accepted: 04/11/2024] [Indexed: 06/05/2024]
Abstract
Low temperature phase separation in mixtures of ^{3}He and ^{4}He isotopes is a unique property of quantum fluids. Hydrogen has long been considered as another potential quantum liquid and has been predicted to be superfluid at T≤1 K, well below freezing temperature of ≈14 K. Phase separation has also been predicted in mixtures of para-H_{2} and D_{2} at temperatures ≤3 K. To defer the freezing, we produced clusters containing para-H_{2} and D_{2} at an estimated temperature of ≈2 K whose state was studied by vibrational Raman spectroscopy. The results indicate that the clusters are liquid and show the phase separation of the isotopes. The phase separation is further corroborated by the quantum molecular dynamics simulation.
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Affiliation(s)
- Russell Sliter
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA
| | - Kim Hyeon-Deuk
- Department of Chemistry, Kyoto University, Kyoto 606-8502, Japan
| | - Andrey F Vilesov
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA
- Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089, USA
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2
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Otani H, Nakahara H, Goto H, Kuma S, Momose T. Electronic spectroscopy of Mg-phthalocyanine embedded in cold hydrogen clusters produced by a pulsed nozzle. J Chem Phys 2021; 155:044309. [PMID: 34340371 DOI: 10.1063/5.0056499] [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
Cold clusters of molecular hydrogen were created using a pulsed nozzle. The thermodynamical states of the clusters were characterized by measuring the cluster beam velocity and the laser-induced fluorescence (LIF) spectra of embedded molecules. Two distinct velocity components were identified in the beam that originates from different clustering mechanisms. The fast velocity component corresponds to the expansion of H2 from the gas phase, while the slow velocity component corresponds to the expansion from the liquid phase. The velocity distribution of these two components showed no significant difference between the expansions of para and normal hydrogen. In this study, LIF spectroscopy of single Mg-phthalocyanine molecules embedded in the H2 clusters consisting of 105 H2 molecules was used to investigate the properties of the fast component. The observed peak frequencies of the LIF signals, compared to those observed in helium droplets, were used to infer the possible presence of the liquid phase in the fast component of the H2 clusters below 5 K. The shift, linewidth, and splitting in the spectra, which strongly depend on the ortho/para ratio, are attributed to the local configurations of hydrogen in the vicinity of the probe molecules.
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Affiliation(s)
- Hatsuki Otani
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Hiroko Nakahara
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Haruka Goto
- Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Susumu Kuma
- Atomic, Molecular, and Optical Physics Laboratory, RIKEN, Saitama 351-0198, Japan
| | - Takamasa Momose
- Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
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3
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Abe K, Yamaoka S, Hyeon-Deuk K. Isotopic Effects on Intermolecular and Intramolecular Structure and Dynamics in Hydrogen, Deuterium, and Tritium Liquids: Normal Liquid and Weakly and Strongly Cooled Liquids. J Phys Chem B 2018; 122:8233-8242. [PMID: 30095260 DOI: 10.1021/acs.jpcb.8b02596] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Differences in properties such as phase-transition temperature and transport coefficients among liquids of different isotopic compositions, hydrogen, deuterium, and tritium, should originate from their differently pronounced nuclear quantum effects (NQEs) rather than from any subtle difference in the electronic interaction potentials. Accurate and efficient determination of structural and dynamical isotopic effects in the quantum liquids still remains as one of the challenging problems in condensed-phase physics. With a recently developed nonempirical real-time molecular dynamics method which describes nonspherical molecules with the NQEs, we computationally realized and investigated dynamical and quantum isotopic effects of not only traditionally studied isotopes, hydrogen, and deuterium but also a lesser known radioisotope, tritium, in broad thermodynamic conditions from normal liquid to weakly and strongly cooled liquids, which have been hindered by rapid crystallization in spite of numerous experimental attempts at supercooling. Reproducing the previously reported experimental isotope dependence on the bond length and vibrational frequencies of hydrogen, deuterium, and tritium liquids, we further demonstrate that distinctive isotope effects appear in their intermolecular and intramolecular structure and dynamics not only at lower temperature but also at higher temperature, which none has so far been able to obtain quantitative results for realistic systems. Rationalization of their physical origins and the obtained physical insights will help future experimental searching and monitoring intermolecular and intramolecular dynamics and structures of these isotopes not only in normal liquid but also in supercooled liquid.
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Affiliation(s)
- Kiharu Abe
- Department of Chemistry , Kyoto University , Kyoto 606-8502 , Japan
| | - Shutaro Yamaoka
- Department of Chemistry , Kyoto University , Kyoto 606-8502 , Japan
| | - Kim Hyeon-Deuk
- Department of Chemistry , Kyoto University , Kyoto 606-8502 , Japan.,Japan Science and Technology Agency, PRESTO , 4-1-8 Honcho , Kawaguchi , Saitama 332-0012 , Japan
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4
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Miura S. Quantum structural fluctuation in para-hydrogen clusters revealed by the variational path integral method. J Chem Phys 2018; 148:102333. [DOI: 10.1063/1.5005126] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Shinichi Miura
- Faculty of Mathematics and Physics, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
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5
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Abe K, Hyeon-Deuk K. Dynamical Ordering of Hydrogen Molecules Induced by Heat Flux. J Phys Chem Lett 2017; 8:3595-3600. [PMID: 28722419 DOI: 10.1021/acs.jpclett.7b01350] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Achieving a direct nonequilibrium simulation for hydrogen systems has been quite challenging because nuclear quantum effects (NQEs) have to be taken into account. We directly simulated nonequilibrium hydrogen molecules under a temperature gradient with the recently developed nonempirical molecular dynamics method, which describes nonspherical hydrogen molecules with the NQEs. We found dynamical ordering purely induced by heat flux, which should be distinguished from static ordering like orientational alignment, as decelerated translational motions and enhanced intensity of H-H vibrational power spectra despite the little structural ordering. This dynamical ordering, which was enhanced with stronger heat flux while independent of system size, can be regarded as self-solidification of hydrogen molecules for their efficient heat conduction.
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Affiliation(s)
- Kiharu Abe
- Department of Chemistry, Kyoto University , Kyoto 606-8502, Japan
| | - Kim Hyeon-Deuk
- Department of Chemistry, Kyoto University , Kyoto 606-8502, Japan
- Japan Science and Technology Agency, PRESTO , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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6
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Hoshina H, Sliter R, Ravi A, Kuma S, Momose T, Vilesov AF. Ro‐vibrational Spectra of (
para
‐H
2
)
N
‐CH
4
in He Droplets. Chemphyschem 2016; 17:3818-3825. [DOI: 10.1002/cphc.201600484] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Hiromichi Hoshina
- Department of Chemistry University of Southern California Los Angeles CA 90089 USA
- Terahertz Sensing and Imaging Laboratory RIKEN 519-1399 Aramaki-Aoba, Aoba-ku Sendai, Miyagi 980-0845 Japan
| | - Russell Sliter
- Department of Chemistry University of Southern California Los Angeles CA 90089 USA
- KLA-Tencor 1 Technology Drive Milpitas CA 95035 USA
| | - Aakash Ravi
- Department of Chemistry The University of British Columbia Vancouver BC V6T 1Z1 Canada
- Department of Physics Harvard University 17 Oxford Street Cambridge MA 02138 USA
| | - Susumu Kuma
- Department of Chemistry The University of British Columbia Vancouver BC V6T 1Z1 Canada
- Atomic, Molecular & Optical Physics Laboratory RIKEN 2-1 Hirosawa Wako Saitama 351-0198 Japan
| | - Takamasa Momose
- Department of Chemistry The University of British Columbia Vancouver BC V6T 1Z1 Canada
| | - Andrey F. Vilesov
- Department of Chemistry University of Southern California Los Angeles CA 90089 USA
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7
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Hyeon-Deuk K, Ando K. Distinct structural and dynamical difference between supercooled and normal liquids of hydrogen molecules. Phys Chem Chem Phys 2016; 18:2314-8. [PMID: 26750610 DOI: 10.1039/c5cp06615h] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Supercooled hydrogen liquid as well as superfluid have continued to elude experimental observation due to rapid crystallization. We computationally realized and investigated supercooled hydrogen liquid by a recently developed non-empirical real-time molecular dynamics method, which describes non-spherical hydrogen molecules with the nuclear quantum effects. We demonstrated that the hydrogen supercooled liquid is not a simply cooled liquid but rather exhibits intrinsic structural and dynamical characters including a precursor of tunneling and superfluidity which neither normal hydrogen liquid nor solid possesses. All of the insights provide a milestone for planning experiments of metastable hydrogen systems like glassy and superfluid states and for identifying various unknown hydrogen phases.
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Affiliation(s)
- Kim Hyeon-Deuk
- Department of Chemistry, Kyoto University, Kyoto 606-8502, Japan. and Japan Science and Technology Agency, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Koji Ando
- Department of Chemistry, Kyoto University, Kyoto 606-8502, Japan.
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8
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Slipchenko MN, Hoshina H, Stolyarov D, Sartakov BG, Vilesov AF. Internal Rotation of Methane Molecules in Large Clusters. J Phys Chem Lett 2016; 7:47-50. [PMID: 26653992 DOI: 10.1021/acs.jpclett.5b02548] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Methane is one of the very few substances that show rotation of individual molecules in the crystalline phase. Here we explore the evolution of the rotation spectrum of methane from single molecules to clusters containing up to about 4 × 10(3) molecules. The clusters were assembled in He droplets at T = 0.38 K and studied via infrared laser spectroscopy in the ν3 region of the methane molecules. Well-resolved rotational structure in the spectra was observed in clusters containing up to about 50 molecules. We have concluded that in distinction to the crystals molecular rotation in methane clusters is confined to the surface and is enabled by low coordination of the molecules. On the contrary the molecules in the cluster's interior are in amorphous state wherein the rotation is quenched. These results demonstrate that even at very low temperature the surface of the methane clusters remains fluxional due to quantum effects.
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Affiliation(s)
- Mikhail N Slipchenko
- Department of Chemistry, University of Southern California , Los Angeles, California 90089, United States
| | - Hiromichi Hoshina
- Department of Chemistry, University of Southern California , Los Angeles, California 90089, United States
| | - Daniil Stolyarov
- Department of Chemistry, University of Southern California , Los Angeles, California 90089, United States
| | - Boris G Sartakov
- General Physics Institute, RAS , Vavilov str. 38, 119991 Moscow, Russia
| | - Andrey F Vilesov
- Department of Chemistry, University of Southern California , Los Angeles, California 90089, United States
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9
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Dvorak M, Müller M, Bünermann O, Stienkemeier F. Size dependent transition to solid hydrogen and argon clusters probed via spectroscopy of PTCDA embedded in helium nanodroplets. J Chem Phys 2015; 140:144301. [PMID: 24735293 DOI: 10.1063/1.4870395] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Complexes made of either Ar(N) or (H2)N clusters (N = 1-170) and a single PTCDA molecule (3,4,9,10-perylene-tetracarboxylic-dianhydride) are assembled inside helium droplets and spectroscopically studied via laser-induced fluorescence spectroscopy. The frequency shift and line-broadening are analyzed as a function of N and of the pick-up order of the PTCDA and cluster material in order to track liquid or solid properties of the clusters. For argon, the solid phase is observed for N > 10 above which the pick-up order dramatically influences the localization of the chromophore with respect to the Ar cluster. If the droplets are doped first with Ar, the chromophore remains on the surface of a solid cluster whereas for the reversed pick-up order the molecule is surrounded by an argon shell. At N < 10 wetting and the formation of the first solvation shell are observed. For para-hydrogen, a transition to the solid is observed at N ~ 20-25, confirming previous theoretical predictions on the existence of a liquid-like phase at such small sizes, even below the bulk hydrogen freezing temperature.
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Affiliation(s)
- Matthieu Dvorak
- Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - Markus Müller
- Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - Oliver Bünermann
- Institut für Physikalische Chemie, Georg-August-Universität Tammannstr. 6, 37077 Göttingen, Germany
| | - Frank Stienkemeier
- Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
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10
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Idowu S, Boninsegni M. Superfluid response of two-dimensional parahydrogen clusters in confinement. J Chem Phys 2015; 142:134303. [PMID: 25854239 DOI: 10.1063/1.4916616] [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
We study by computer simulations the effect of confinement on the superfluid properties of small two-dimensional (2D) parahydrogen clusters. For clusters of fewer than twenty molecules, the superfluid response in the low temperature limit is found to remain comparable in magnitude to that of free clusters, within a rather wide range of depth and size of the confining well. The resilience of the superfluid response is attributable to the "supersolid" character of these clusters. We investigate the possibility of establishing a bulk 2D superfluid "cluster crystal" phase of p-H2, in which a global superfluid response would arise from tunnelling of molecules across adjacent unit cells. The computed energetics suggests that for clusters of about ten molecules, such a phase may be thermodynamically stable against the formation of the equilibrium insulating crystal, for values of the cluster crystal lattice constant possibly allowing tunnelling across adjacent unit cells.
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Affiliation(s)
- Saheed Idowu
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E7, Canada
| | - Massimo Boninsegni
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E7, Canada
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11
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Idowu S, Boninsegni M. Systematics of small parahydrogen clusters in two dimensions. J Chem Phys 2014; 140:204310. [DOI: 10.1063/1.4878376] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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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Zeng T, Roy PN. Microscopic molecular superfluid response: theory and simulations. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2014; 77:046601. [PMID: 24647079 DOI: 10.1088/0034-4885/77/4/046601] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Since its discovery in 1938, superfluidity has been the subject of much investigation because it provides a unique example of a macroscopic manifestation of quantum mechanics. About 60 years later, scientists successfully observed this phenomenon in the microscopic world though the spectroscopic Andronikashvili experiment in helium nano-droplets. This reduction of scale suggests that not only helium but also para-H2 (pH2) can be a candidate for superfluidity. This expectation is based on the fact that the smaller number of neighbours and surface effects of a finite-size cluster may hinder solidification and promote a liquid-like phase. The first prediction of superfluidity in pH2 clusters was reported in 1991 based on quantum Monte Carlo simulations. The possible superfluidity of pH2 was later indirectly observed in a spectroscopic Andronikashvili experiment in 2000. Since then, a growing number of studies have appeared, and theoretical simulations have been playing a special role because they help guide and interpret experiments. In this review, we go over the theoretical studies of pH2 superfluid clusters since the experiment of 2000. We provide a historical perspective and introduce the basic theoretical formalism along with key experimental advances. We then present illustrative results of the theoretical studies and comment on the possible future developments in the field. We include sufficient theoretical details such that the review can serve as a guide for newcomers to the field.
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Affiliation(s)
- Tao Zeng
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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13
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Dvorak M, Müller M, Knoblauch T, Bünermann O, Rydlo A, Minniberger S, Harbich W, Stienkemeier F. Spectroscopy of 3, 4, 9, 10-perylenetetracarboxylic dianhydride (PTCDA) attached to rare gas samples: Clusters vs. bulk matrices. I. Absorption spectroscopy. J Chem Phys 2012; 137:164301. [DOI: 10.1063/1.4759443] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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Raston PL, Jäger W, Li H, Le Roy RJ, Roy PN. Persistent molecular superfluid response in doped para-hydrogen clusters. PHYSICAL REVIEW LETTERS 2012; 108:253402. [PMID: 23004599 DOI: 10.1103/physrevlett.108.253402] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2011] [Indexed: 06/01/2023]
Abstract
Direct observation of superfluid response in para-hydrogen (p-H(2)) remains a challenge because of the need for a probe that would not induce localization and a resultant reduction in superfluid fraction. Earlier work [H. Li, R. J. Le Roy, P.-N. Roy, and A. R. W. McKellar, Phys. Rev. Lett. 105, 133401 (2010)] has shown that carbon dioxide can probe the effective inertia of p-H(2) although larger clusters show a lower superfluid response due to localization. It is shown here that the lighter carbon monoxide probe molecule allows one to measure the effective inertia of p-H(2) clusters while maintaining a maximum superfluid response with respect to dopant rotation. Microwave spectroscopy and a theoretical analysis based on Feynman path-integral simulations are used to support this conclusion.
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Affiliation(s)
- P L Raston
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
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15
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Kühnel M, Fernández JM, Tejeda G, Kalinin A, Montero S, Grisenti RE. Time-resolved study of crystallization in deeply cooled liquid parahydrogen. PHYSICAL REVIEW LETTERS 2011; 106:245301. [PMID: 21770578 DOI: 10.1103/physrevlett.106.245301] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2011] [Revised: 05/17/2011] [Indexed: 05/31/2023]
Abstract
We present real-time measurements of the crystallization process occurring in liquid para-hydrogen (para-H(2)) quenched to ≈0.65T(m) (T(m)=13.8 K is the melting point of bulk liquid para-H(2)). The combination of high spatial resolution Raman spectroscopy and liquid microjet generation allows, in situ, capturing structural changes with ∼10(-8) s time resolution. Our results provide a crystal growth rate that rules out a thermally activated freezing process and reveal that the quenched melt freezes into a metastable polymorph, which undergoes a structural transition. The achieved temporal control offers new opportunities for exploring the elementary processes of nonequilibrium phase transformations in supercooled liquids.
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Affiliation(s)
- Matthias Kühnel
- Institut für Kernphysik, J W Goethe-Universität, Frankfurt am Main, Germany
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16
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Kuma S, Nakahara H, Tsubouchi M, Takahashi A, Mustafa M, Sim G, Momose T, Vilesov AF. Laser Induced Fluorescence Spectroscopy of Tetracene with Large Ar, Ne, and H2 Clusters in Superfluid He Nanodroplets. J Phys Chem A 2011; 115:7392-9. [DOI: 10.1021/jp203341r] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Susumu Kuma
- Department of Chemistry, The University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Hiroko Nakahara
- Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Masaaki Tsubouchi
- Department of Chemistry, The University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Akira Takahashi
- Department of Chemistry, The University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Majd Mustafa
- Department of Chemistry, The University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Goeun Sim
- Department of Chemistry, The University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Takamasa Momose
- Department of Chemistry, The University of British Columbia, Vancouver, BC V6T 1Z1, Canada
- Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Andrey F. Vilesov
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
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17
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Sola E, Boronat J. Solidification of Small p-H2 Clusters at Zero Temperature. J Phys Chem A 2011; 115:7071-6. [DOI: 10.1021/jp112378h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- E. Sola
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Donostia, Spain
| | - J. Boronat
- Department de Física i Enginyeria Nuclear, Campus Nord B4-B5, Universitat Politècnica de Catalunya, E-08034 Barcelona, Spain
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18
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Sevryuk MB, Toennies JP, Ceperley DM. Why are para-hydrogen clusters superfluid? A quantum theorem of corresponding states study. J Chem Phys 2010; 133:064505. [DOI: 10.1063/1.3458640] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Grebenev S, Sartakov BG, Toennies JP, Vilesov AF. Spectroscopic investigation of OCS (p-H2)n (n=1–16) complexes inside helium droplets: Evidence for superfluid behavior. J Chem Phys 2010; 132:064501. [DOI: 10.1063/1.3274509] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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20
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Morilla JH, Fernández JM, Tejeda G, Montero S. The onset of molecular condensation: hydrogen. Phys Chem Chem Phys 2010; 12:12060-4. [DOI: 10.1039/c003376f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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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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22
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Sliter R, Vilesov AF. Temperature dependence of the Raman spectra of liquid parahydrogen. J Chem Phys 2009; 131:074502. [DOI: 10.1063/1.3194295] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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