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Janbazi M, T. Azar Y, Ziaie F. EPR parameters of L-α-alanine radicals in aqueous solution: a first-principles study. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1456684] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Mehdi Janbazi
- Radiation Application Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
| | - Yavar T. Azar
- Physics and Accelerator Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
| | - Farhood Ziaie
- Radiation Application Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
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2
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Kusakovskij J, Maes K, Callens F, Vrielinck H. ENDOR-Induced EPR of Disordered Systems: Application to X-Irradiated Alanine. J Phys Chem A 2018; 122:1756-1763. [DOI: 10.1021/acs.jpca.7b11804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jevgenij Kusakovskij
- Ghent University, Department of Solid State Sciences, Krijgslaan 281-S1, 9000 Ghent, Belgium
| | - Kwinten Maes
- Ghent University, Department of Solid State Sciences, Krijgslaan 281-S1, 9000 Ghent, Belgium
| | - Freddy Callens
- Ghent University, Department of Solid State Sciences, Krijgslaan 281-S1, 9000 Ghent, Belgium
| | - Henk Vrielinck
- Ghent University, Department of Solid State Sciences, Krijgslaan 281-S1, 9000 Ghent, Belgium
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3
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Jåstad EO, Torheim T, Villeneuve KM, Kvaal K, Hole EO, Sagstuen E, Malinen E, Futsaether CM. In Quest of the Alanine R3 Radical: Multivariate EPR Spectral Analyses of X-Irradiated Alanine in the Solid State. J Phys Chem A 2017; 121:7139-7147. [PMID: 28829916 DOI: 10.1021/acs.jpca.7b06447] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The amino acid l-α-alanine is the most commonly used material for solid-state electron paramagnetic resonance (EPR) dosimetry, due to the formation of highly stable radicals upon irradiation, with yields proportional to the radiation dose. Two major alanine radical components designated R1 and R2 have previously been uniquely characterized from EPR and electron-nuclear double resonance (ENDOR) studies as well as from quantum chemical calculations. There is also convincing experimental evidence of a third minor radical component R3, and a tentative radical structure has been suggested, even though no well-defined spectral signature has been observed experimentally. In the present study, temperature dependent EPR spectra of X-ray irradiated polycrystalline alanine were analyzed using five multivariate methods in further attempts to understand the composite nature of the alanine dosimeter EPR spectrum. Principal component analysis (PCA), maximum likelihood common factor analysis (MLCFA), independent component analysis (ICA), self-modeling mixture analysis (SMA), and multivariate curve resolution (MCR) were used to extract pure radical spectra and their fractional contributions from the experimental EPR spectra. All methods yielded spectral estimates resembling the established R1 spectrum. Furthermore, SMA and MCR consistently predicted both the established R2 spectrum and the shape of the R3 spectrum. The predicted shape of the R3 spectrum corresponded well with the proposed tentative spectrum derived from spectrum simulations. Thus, results from two independent multivariate data analysis techniques strongly support the previous evidence that three radicals are indeed present in irradiated alanine samples.
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Affiliation(s)
- Eirik O Jåstad
- Faculty of Science and Technology, Norwegian University of Life Sciences , P.O. Box 5003, 1432 Ås, Norway
| | - Turid Torheim
- Faculty of Science and Technology, Norwegian University of Life Sciences , P.O. Box 5003, 1432 Ås, Norway
| | - Kathleen M Villeneuve
- Department of Physics, University of Oslo , P.O. Box 1048 Blindern, 0316 Oslo, Norway
| | - Knut Kvaal
- Faculty of Science and Technology, Norwegian University of Life Sciences , P.O. Box 5003, 1432 Ås, Norway
| | - Eli O Hole
- Department of Physics, University of Oslo , P.O. Box 1048 Blindern, 0316 Oslo, Norway
| | - Einar Sagstuen
- Department of Physics, University of Oslo , P.O. Box 1048 Blindern, 0316 Oslo, Norway
| | - Eirik Malinen
- Department of Physics, University of Oslo , P.O. Box 1048 Blindern, 0316 Oslo, Norway.,Department of Medical Physics, Oslo University Hospital , P.O. Box 4953 Nydalen, 0424 Oslo, Norway
| | - Cecilia M Futsaether
- Faculty of Science and Technology, Norwegian University of Life Sciences , P.O. Box 5003, 1432 Ås, Norway
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Pauwels E, De Cooman H, Waroquier M, Hole EO, Sagstuen E. Solved? The reductive radiation chemistry of alanine. Phys Chem Chem Phys 2014; 16:2475-82. [DOI: 10.1039/c3cp54441a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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5
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Maltar-Strmečki N, Rakvin B. Investigation of the nitrogen hyperfine coupling of the second stable radical in γ-irradiated l-alanine crystals by 2D-HYSCORE spectroscopy. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2012; 222:81-87. [PMID: 22854218 DOI: 10.1016/j.jmr.2012.06.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Revised: 06/28/2012] [Accepted: 06/30/2012] [Indexed: 06/01/2023]
Abstract
The second stable radical, NH(3)(+)C()(CH(3))COO(-), R2, in the γ-irradiated single crystal of l-alanine and its fully (15)N-enriched analogue were studied by an advanced pulsed EPR technique, 2D-HYSCORE (two-dimensional hyperfine sublevel correlation) spectroscopy at 200K. The nitrogen hyperfine coupling tensor of the R2 radical was determined from the HYSCORE data and provides new experimental data for improved characterization of the R2 radical in the crystal lattice. The results obtained complement the experimental proton data available for the R2 radical and could lead to increased accuracy and reliability of EPR spectrum simulations.
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Rakvin B, Maltar-Strmečki N, KattNig D, Grampp G. ENDOR study of the dynamic properties of stable paramagnetic centres in γ -irradiated L-alanine crystals. Mol Phys 2010. [DOI: 10.1080/00268970701616048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Rakvin B, Maltar-Strmečki N, Kattnig D, Grampp G. ENDOR Study on the Dynamic Properties of the First Stable Paramagnetic Center in γ-Irradiated l-Alanine Crystals. J Phys Chem A 2010; 114:7500-5. [DOI: 10.1021/jp103883x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Boris Rakvin
- Ruđer Bošković Institute, P.O. Box 180, 10002, Zagreb, Croatia, Faculty of Veterinary Medicine, University of Zagreb, P.O. Box 466, 10002, Zagreb, Croatia, and Institute of Physical and Theoretical Chemistry, Graz University of Technology, Technikerstrasse 4/I, A-8010 Graz, Austria
| | - Nadica Maltar-Strmečki
- Ruđer Bošković Institute, P.O. Box 180, 10002, Zagreb, Croatia, Faculty of Veterinary Medicine, University of Zagreb, P.O. Box 466, 10002, Zagreb, Croatia, and Institute of Physical and Theoretical Chemistry, Graz University of Technology, Technikerstrasse 4/I, A-8010 Graz, Austria
| | - Daniel Kattnig
- Ruđer Bošković Institute, P.O. Box 180, 10002, Zagreb, Croatia, Faculty of Veterinary Medicine, University of Zagreb, P.O. Box 466, 10002, Zagreb, Croatia, and Institute of Physical and Theoretical Chemistry, Graz University of Technology, Technikerstrasse 4/I, A-8010 Graz, Austria
| | - Günter Grampp
- Ruđer Bošković Institute, P.O. Box 180, 10002, Zagreb, Croatia, Faculty of Veterinary Medicine, University of Zagreb, P.O. Box 466, 10002, Zagreb, Croatia, and Institute of Physical and Theoretical Chemistry, Graz University of Technology, Technikerstrasse 4/I, A-8010 Graz, Austria
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Chen F, Ramirez JV, Nicolucci P, Baffa O. Sensitivity comparison of two L-alanine doped blends to different photon energies. HEALTH PHYSICS 2010; 98:383-387. [PMID: 20065709 DOI: 10.1097/01.hp.0000348003.11889.68] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Blends of L-alanine (85% weight proportion) with KI (10%) and with PbI2 (10%), these last two compounds acting as dopants, and with PVA (5%) acting as binder, were prepared in water at 80 degrees C. A blend of pure L-alanine (95%) with PVA (5%) was also prepared. The three blends were irradiated with photon beams of different energies (120 kV, Co, and 10 MV) to a unique dose of 30 Gy to compare their sensitivities for those three energies. EPR spectra of the three irradiated blends were recorded in a K-Band spectrometer (24 GHz) taking aliquots of about 4 mg for each blend. The energy sensitivity of a blend was defined as the peak-to-peak amplitude of its EPR spectrum central line. For the Co energy (1.25 MeV) the blends presented practically the same sensitivity, indicating that the presence of the dopants does not affect the sensitivity of L-alanine. For 10 MV x-rays, there was an increment (around 10%-20%) in sensitivity for the two L-alanine doped blends compared with the pure L-alanine blend (not doped). In the case of 120 kV x-rays, the blends ala+KI and ala+PbI showed increments of 10 and 20 times more sensitivity than the pure L-alanine blend. It is concluded that the dopants KI and PbI2 produce a great enhancement of the L-alanine sensitivity to low-energy photons. For the same dopant's content (10%) in the blend, PbI2 showed a better performance. Increasing the PbI2 proportion (30%) in the blend allows the detection of radiation dose as low as 10 mGy for 120 kV x-rays. These results encourage the authors to try to enhance the sensitivity of L-alanine even more by increasing the dopant's content in the blend and diminishing the lower limit detection. Application of these L-alanine doped blends in the dosimetry in diagnostic radiology could be possible.
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Affiliation(s)
- Felipe Chen
- Departamento de Física e Matemática, FFCLRP-Universidade de São Paulo, 14040-901, Ribeirão Preto-SP, Brasil.
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Pauwels E, De Cooman H, Waroquier M, Hole EO, Sagstuen E. On the identity of the radiation-induced stable alanine radical. Phys Chem Chem Phys 2010; 12:8733-6. [DOI: 10.1039/c004380j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Rakvin B, Maltar-Strmečki N. Study of the first stable l-alanine paramagnetic center by 2D-HYSCORE spectroscopy: Detection of 14N hyperfine and quadrupole splitting. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.08.138] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Ptasińska S, Denifl S, Candori P, Matejcik S, Scheier P, Märk T. Dissociative electron attachment to gas phase alanine. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2004.12.115] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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13
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Sagstuen E, Sanderud A, Hole EO. The Solid-State Radiation Chemistry of Simple Amino Acids, Revisited. Radiat Res 2004; 162:112-9. [PMID: 15387137 DOI: 10.1667/rr3215] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The solid-state radiation-induced free radical formation in simple amino acids like alpha-glycine (gly) and L-alpha-alanine (ala) has been the subject of investigations by EPR spectroscopy since the late 1950s. The EPR spectra from crystals of gly and ala generally are very complex due to the simultaneous trapping of several free radicals regardless of irradiation and observation temperatures. Untangling these complex spectra is necessary for understanding the mechanisms for the solid-state radiation chemistry of amino acids. Recently, radical formation in gly and ala after room-temperature irradiation has been reinvestigated in our laboratories using X-, K- and Q-band EPR and ENDOR spectroscopy, combined with the ENDOR-induced EPR (EIE) techniques as well as single-crystal and powder EPR and ENDOR spectrum simulations. Several new radical products have been detected and characterized, most prominently the gly species H2N - C x H - COOH and the ala species H3+N - C x (CH3) - COO and H2N - C x (CH3) - COOH. A short description of these radicals is given, and an overview of the solid-state radiation chemistry of the simple amino acids is presented, based on a review of the literature combined with these recent experimental results.
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Affiliation(s)
- Einar Sagstuen
- Department of Physics, University of Oslo, N-0316 Oslo 3, Norway.
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14
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Vanhaelewyn GCAM, Jansen B, Pauwels E, Sagstuen E, Waroquier M, Callens FJ. Experimental and Theoretical Electron Magnetic Resonance Study on Radiation-Induced Radicals in α-l-Sorbose Single Crystals. J Phys Chem A 2004. [DOI: 10.1021/jp037886o] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gauthier C. A. M. Vanhaelewyn
- Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium, Department of Physics, University of Oslo, P.O. Box 1048 Blindern, N-0316 Oslo, Norway, and Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium
| | - Bjørn Jansen
- Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium, Department of Physics, University of Oslo, P.O. Box 1048 Blindern, N-0316 Oslo, Norway, and Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium
| | - Ewald Pauwels
- Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium, Department of Physics, University of Oslo, P.O. Box 1048 Blindern, N-0316 Oslo, Norway, and Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium
| | - Einar Sagstuen
- Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium, Department of Physics, University of Oslo, P.O. Box 1048 Blindern, N-0316 Oslo, Norway, and Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium
| | - Michel Waroquier
- Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium, Department of Physics, University of Oslo, P.O. Box 1048 Blindern, N-0316 Oslo, Norway, and Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium
| | - Freddy J. Callens
- Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium, Department of Physics, University of Oslo, P.O. Box 1048 Blindern, N-0316 Oslo, Norway, and Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium
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15
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Improta R, Barone V. Interplay of Electronic, Environmental, and Vibrational Effects in Determining the Hyperfine Coupling Constants of Organic Free Radicals. Chem Rev 2004; 104:1231-54. [PMID: 15008622 DOI: 10.1021/cr960085f] [Citation(s) in RCA: 299] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Roberto Improta
- Dipartimento di Chimica, Università Federico II, Complesso Universitario Monte S Angelo, Via Cintia, I-80126 Napoli, Italy
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16
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Chuvylkin ND, Tokmachev AM. Estimates of magnetic resonance parameters in semi-empirical quantum chemistry. RESEARCH ON CHEMICAL INTERMEDIATES 2004. [DOI: 10.1163/156856704322798098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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Malinen E, Heydari MZ, Sagstuen E, Hole EO. Alanine radicals, part 3: properties of the components contributing to the EPR spectrum of X-irradiated alanine dosimeters. Radiat Res 2003; 159:23-32. [PMID: 12492365 DOI: 10.1667/0033-7587(2003)159[0023:arppot]2.0.co;2] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The amino acid l-alpha-alanine has attracted considerable interest for use in radiation dosimetry and has been formally accepted as a secondary standard for high-dose and transfer dosimetry. Recent results have shown that the alanine EPR spectrum consists of contributions from three different radicals. A set of benchmark spectra describing the essential spectral features of these three radical components was used for reconstructions of the experimental spectra. In the present work, these basis spectra have been used to investigate the differential effects of variations in radiation doses and microwave power, as well as the dependence upon temperature annealing and UV illumination. The results presented here, based solely on relatively low-energy (60-80 keV) X rays, indicate that the three components behave very similarly with respect to radiation dose at room temperature. However, with respect to the thermal annealing/fading behavior and microwave power saturation properties, the three species behave significantly differently. It is concluded that even if it is now realized that three different radicals contribute to the composite EPR alanine spectrum, this has a minor impact on the established protocols for present-day applications (high-dose) of EPR/alanine dosimetry. However, some care should be exercised when e.g. constructing calibration curves, since fading and power saturation behavior may vary over the dose range in question. New results from UV-illumination experiments suggest a possible procedure for experimental spectral separation of the EPR signals due to the three radicals.
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Affiliation(s)
- Eirik Malinen
- Department of Physics, University of Oslo, P.O. Box 1048 Blindern, N-0316 Oslo 3, Norway
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18
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Pauwels E, Lahorte P, Vanhaelewyn G, Callens F, De Proft F, Geerlings P, Waroquier M. Tentative Structures for the Radiation-Induced Radicals in Crystalline β-d-Fructose Using Density Functional Theory. J Phys Chem A 2002. [DOI: 10.1021/jp0264174] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ewald Pauwels
- Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium, European Patent Office, Bayerstrasse 34, D-80335 Munich, Germany, Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium, and Eenheid Algemene Chemie (ALGC), Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium
| | - Philippe Lahorte
- Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium, European Patent Office, Bayerstrasse 34, D-80335 Munich, Germany, Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium, and Eenheid Algemene Chemie (ALGC), Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium
| | - Gauthier Vanhaelewyn
- Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium, European Patent Office, Bayerstrasse 34, D-80335 Munich, Germany, Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium, and Eenheid Algemene Chemie (ALGC), Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium
| | - Freddy Callens
- Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium, European Patent Office, Bayerstrasse 34, D-80335 Munich, Germany, Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium, and Eenheid Algemene Chemie (ALGC), Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium
| | - Frank De Proft
- Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium, European Patent Office, Bayerstrasse 34, D-80335 Munich, Germany, Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium, and Eenheid Algemene Chemie (ALGC), Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium
| | - Paul Geerlings
- Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium, European Patent Office, Bayerstrasse 34, D-80335 Munich, Germany, Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium, and Eenheid Algemene Chemie (ALGC), Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium
| | - Michel Waroquier
- Laboratory of Theoretical Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium, European Patent Office, Bayerstrasse 34, D-80335 Munich, Germany, Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, B-9000 Gent, Belgium, and Eenheid Algemene Chemie (ALGC), Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium
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Heydari MZ, Malinen E, Hole EO, Sagstuen E. Alanine Radicals. 2. The Composite Polycrystalline Alanine EPR Spectrum Studied by ENDOR, Thermal Annealing, and Spectrum Simulations. J Phys Chem A 2002. [DOI: 10.1021/jp026023c] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mojgan Z. Heydari
- Department of Physics, University of Oslo, P.O. Box 1048 Blindern, N-0316 Oslo 3, Norway
| | - Eirik Malinen
- Department of Physics, University of Oslo, P.O. Box 1048 Blindern, N-0316 Oslo 3, Norway
| | - Eli O. Hole
- Department of Physics, University of Oslo, P.O. Box 1048 Blindern, N-0316 Oslo 3, Norway
| | - Einar Sagstuen
- Department of Physics, University of Oslo, P.O. Box 1048 Blindern, N-0316 Oslo 3, Norway
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20
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Affiliation(s)
- T. L. Petrenko
- Institute of Physics of Semiconductors, National Academy of Sciences, Prosp. Nauky 45, Kyiv 03028, Ukraine
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Pauwels E, Van Speybroeck V, Lahorte P, Waroquier M. Density Functional Calculations on Alanine-Derived Radicals: Influence of Molecular Environment on EPR Hyperfine Coupling Constants. J Phys Chem A 2001. [DOI: 10.1021/jp0110657] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- E. Pauwels
- Laboratory of Theoretical Physics, Universiteit Gent, Proeftuinstraat 86, B-9000 Gent, Belgium
| | - V. Van Speybroeck
- Laboratory of Theoretical Physics, Universiteit Gent, Proeftuinstraat 86, B-9000 Gent, Belgium
| | - P. Lahorte
- Laboratory of Theoretical Physics, Universiteit Gent, Proeftuinstraat 86, B-9000 Gent, Belgium
| | - M. Waroquier
- Laboratory of Theoretical Physics, Universiteit Gent, Proeftuinstraat 86, B-9000 Gent, Belgium
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22
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Ban F, Gauld JW, Boyd RJ. Theoretical Studies of the Radiation Products of Hydroxyproline. J Phys Chem A 2000. [DOI: 10.1021/jp001692g] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fuqiang Ban
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J3
| | - James W. Gauld
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J3
| | - Russell J. Boyd
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J3
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23
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Ban F, Gauld JW, Boyd RJ. A Density Functional Theory Study of the Radiation Products of Glycine. J Phys Chem A 2000. [DOI: 10.1021/jp993844h] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fuqiang Ban
- Department of Chemistry, Dalhousie University, Halifax, NS, Canada B3H 4J3
| | - James W. Gauld
- Department of Chemistry, Dalhousie University, Halifax, NS, Canada B3H 4J3
| | - Russell J. Boyd
- Department of Chemistry, Dalhousie University, Halifax, NS, Canada B3H 4J3
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Lahorte P, Proft FD, Callens F, Geerlings P, Mondelaers W. A Density Functional Study of Hyperfine Coupling Constants in Steroid Radicals. J Phys Chem A 1999. [DOI: 10.1021/jp992489s] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Philippe Lahorte
- Department of Subatomic and Radiation Physics, Radiation Physics Group (Member of IBITECH), Gent University, Proeftuinstraat 86, B-9000 Gent, Belgium, Eenheid Algemene Chemie (ALGC), Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium, and Laboratory for Crystallography and Study of the Solid State, Gent University, Krijgslaan 281-S1, B-9000 Gent, Belgium
| | - Frank De Proft
- Department of Subatomic and Radiation Physics, Radiation Physics Group (Member of IBITECH), Gent University, Proeftuinstraat 86, B-9000 Gent, Belgium, Eenheid Algemene Chemie (ALGC), Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium, and Laboratory for Crystallography and Study of the Solid State, Gent University, Krijgslaan 281-S1, B-9000 Gent, Belgium
| | - Freddy Callens
- Department of Subatomic and Radiation Physics, Radiation Physics Group (Member of IBITECH), Gent University, Proeftuinstraat 86, B-9000 Gent, Belgium, Eenheid Algemene Chemie (ALGC), Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium, and Laboratory for Crystallography and Study of the Solid State, Gent University, Krijgslaan 281-S1, B-9000 Gent, Belgium
| | - Paul Geerlings
- Department of Subatomic and Radiation Physics, Radiation Physics Group (Member of IBITECH), Gent University, Proeftuinstraat 86, B-9000 Gent, Belgium, Eenheid Algemene Chemie (ALGC), Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium, and Laboratory for Crystallography and Study of the Solid State, Gent University, Krijgslaan 281-S1, B-9000 Gent, Belgium
| | - Wim Mondelaers
- Department of Subatomic and Radiation Physics, Radiation Physics Group (Member of IBITECH), Gent University, Proeftuinstraat 86, B-9000 Gent, Belgium, Eenheid Algemene Chemie (ALGC), Free University of Brussels, Pleinlaan 2, B-1050 Brussels, Belgium, and Laboratory for Crystallography and Study of the Solid State, Gent University, Krijgslaan 281-S1, B-9000 Gent, Belgium
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