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Tsuge M, Watanabe N. Radical reactions on interstellar icy dust grains: Experimental investigations of elementary processes. PROCEEDINGS OF THE JAPAN ACADEMY. SERIES B, PHYSICAL AND BIOLOGICAL SCIENCES 2023; 99:103-130. [PMID: 37121737 DOI: 10.2183/pjab.99.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Molecular clouds (MCs) in space are the birthplace of various molecular species. Chemical reactions occurring on the cryogenic surfaces of cosmic icy dust grains have been considered to play important roles in the formation of these species. Radical reactions are crucial because they often have low barriers and thus proceed even at low temperatures such as ∼10 K. Since the 2000s, laboratory experiments conducted under low-temperature, high-vacuum conditions that mimic MC environments have revealed the elementary physicochemical processes on icy dust grains. In this review, experiments conducted by our group in this context are explored, with a focus on radical reactions on the surface of icy dust analogues, leading to the formation of astronomically abundant molecules such as H2, H2O, H2CO, and CH3OH and deuterium fractionation processes. The development of highly sensitive, non-destructive methods for detecting adsorbates and their utilization for clarifying the behavior of free radicals on ice, which contribute to the formation of complex organic molecules, are also described.
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Affiliation(s)
- Masashi Tsuge
- Institute of Low Temperature Science, Hokkaido University
| | - Naoki Watanabe
- Institute of Low Temperature Science, Hokkaido University
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Abstract
Excess protons play a key role in the chemical reactions of ice because of their exceptional mobility, even when the diffusion of atoms and molecules is suppressed in ice at low temperatures. This article reviews the current state of knowledge on the properties of excess protons in ice, with a focus on the involvement of protons in chemical reactions. The mechanism of efficient proton transport in ice, which involves a proton-hopping relay along the hydrogen-bond ice network and the reorientation of water, is discussed and compared with the inefficient transport of hydroxide in ice. Distinctly different properties of protons residing in the ice interior and on the ice surface are emphasized. Recent observations of the spontaneous occurrence of reactions in ice at low temperatures, which include the dissociation of protic acids and the hydrolysis of acidic oxides, are discussed with regard to the kinetic and thermodynamic effects of mobile protons on the promotion of unique chemical processes of ice.
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Affiliation(s)
- Du Hyeong Lee
- Korea Polar Research Institute, 26 Songdomirae-ro, Incheon 21990, South Korea
| | - Heon Kang
- Department of Chemistry and The Research Institute of Basic Sciences, Seoul National University, 1 Gwanak-ro, Seoul 08826, South Korea
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Kurzweil-Segev Y, Popov I, Solomonov I, Sagit I, Feldman Y. Dielectric Relaxation of Hydration Water in Native Collagen Fibrils. J Phys Chem B 2017; 121:5340-5346. [DOI: 10.1021/acs.jpcb.7b02404] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Y. Kurzweil-Segev
- Department
of Applied Physics, The Hebrew University of Jerusalem, Edmond
J. Safra Campus, Givat Ram, Jerusalem 91904, Israel
| | - Ivan Popov
- Department
of Applied Physics, The Hebrew University of Jerusalem, Edmond
J. Safra Campus, Givat Ram, Jerusalem 91904, Israel
- Institute
of Physics, Kazan Federal University, Kremlevskaya str.18, Kazan 420008, Tatarstan, Russia
| | - Inna Solomonov
- Department
of Biological Regulation, Weitzman Institute of Science, Rehovot 761001, Israel
| | - Irit Sagit
- Department
of Biological Regulation, Weitzman Institute of Science, Rehovot 761001, Israel
| | - Yuri Feldman
- Department
of Applied Physics, The Hebrew University of Jerusalem, Edmond
J. Safra Campus, Givat Ram, Jerusalem 91904, Israel
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Lee DH, Choi CH, Choi TH, Sung BJ, Kang H. Asymmetric Transport Mechanisms of Hydronium and Hydroxide Ions in Amorphous Solid Water: Hydroxide Goes Brownian while Hydronium Hops. J Phys Chem Lett 2014; 5:2568-2572. [PMID: 26277944 DOI: 10.1021/jz501235y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The diffusion of hydronium (H3O(+)) and hydroxide (OH(-)) ions is one of the most intriguing topics in aqueous chemistry. It is considered that these ions in aqueous solutions move via sequential proton transfer events, known as the Grotthuss mechanisms. Here, we present an experimental study of the diffusion and H/D exchange of hydronium and hydroxide ions in amorphous solid water (ASW) at 140-180 K by using low-energy sputtering (LES) and temperature-programmed desorption (TPD) measurements. The study shows that the two species transport in ASW via fundamentally different molecular mechanisms. Whereas hydronium ions migrate via efficient proton transfer, hydroxide ions move via Brownian molecular diffusion without proton transfer. The molecular hydroxide diffusion in ASW is in stark contrast to the current view of the hydroxide diffusion mechanism in aqueous solution, which involves proton transfer.
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Affiliation(s)
- Du Hyeong Lee
- †Department of Chemistry, Seoul National University, 1 Gwanak-ro, Seoul 151-747, Republic of Korea
| | - Cheol Ho Choi
- ‡Department of Chemistry and Green-Nano Materials Research Center, College of Natural Sciences, Kyungpook National University, Taegu 702-701, Republic of Korea
| | - Tae Hoon Choi
- §Department of Chemical Engineering Education, Chungnam National University, Daejeon 305-764, Republic of Korea
| | - Bong June Sung
- ∥Department of Chemistry and Research Institute of Basic Science, Sogang University, Seoul 121-742, Republic of Korea
| | - Heon Kang
- †Department of Chemistry, Seoul National University, 1 Gwanak-ro, Seoul 151-747, Republic of Korea
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Ishiyama T, Imamura T, Morita A. Theoretical Studies of Structures and Vibrational Sum Frequency Generation Spectra at Aqueous Interfaces. Chem Rev 2014; 114:8447-70. [DOI: 10.1021/cr4004133] [Citation(s) in RCA: 110] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Tatsuya Ishiyama
- Department
of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Takako Imamura
- Department
of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Akihiro Morita
- Department
of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
- Elements
Strategy Initiative for Catalysts and Batteries, Kyoto University, Kyoto 615-8520, Japan
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Wiens JP, Nathanson GM, Alexander WA, Minton TK, Lakshmi S, Schatz GC. Collisions of Sodium Atoms with Liquid Glycerol: Insights into Solvation and Ionization. J Am Chem Soc 2014; 136:3065-74. [DOI: 10.1021/ja4106144] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Justin P. Wiens
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Gilbert M. Nathanson
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - William A. Alexander
- Department of Chemistry, The University of Memphis, Memphis, Tennessee 38152, United States
| | - Timothy K. Minton
- Department of Chemistry and
Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Sankaran Lakshmi
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - George C. Schatz
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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Bag S, Bhuin RG, Natarajan G, Pradeep T. Probing molecular solids with low-energy ions. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2013; 6:97-118. [PMID: 23495731 DOI: 10.1146/annurev-anchem-062012-092547] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Ion/surface collisions in the ultralow- to low-energy (1-100-eV) window represent an excellent technique for investigation of the properties of condensed molecular solids at low temperatures. For example, this technique has revealed the unique physical and chemical processes that occur on the surface of ice, versus the liquid and vapor phases of water. Such instrument-dependent research, which is usually performed with spectroscopy and mass spectrometry, has led to new directions in studies of molecular materials. In this review, we discuss some interesting results and highlight recent developments in the area. We hope that access to the study of molecular solids with extreme surface specificity, as described here, will encourage investigators to explore new areas of research, some of which are outlined in this review.
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Affiliation(s)
- Soumabha Bag
- DST Unit of Nanoscience, Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
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Moon ES, Kim Y, Shin S, Kang H. Asymmetric transport efficiencies of positive and negative ion defects in amorphous ice. PHYSICAL REVIEW LETTERS 2012; 108:226103. [PMID: 23003627 DOI: 10.1103/physrevlett.108.226103] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Indexed: 06/01/2023]
Abstract
Hydronium (H(3)O(+)) ions at an ice surface penetrate into its interior over a substantially longer distance than hydroxide (OH(-)) ions. The observation was made by conducting reactive ion scattering and infrared spectroscopic measurements for the acid-base reaction between surface H(3)O(+) (or OH(-)) and NH(3) (or NH(4)(+)) trapped inside an amorphous ice film at low temperature (<100 K). The study reveals very different transport efficiencies of positive and negative ion defects in ice. This difference is explained by the occurrence of an efficient proton-relay channel for H(3)O(+), which does not exist for OH(-).
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Affiliation(s)
- Eui-seong Moon
- Department of Chemistry, Seoul National University, 1 Gwanak-ro, Seoul 151-747, Republic of Korea
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