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    188宝金博页面版: Hydrogen Molecular Ions in Solid Parahydrogen： EPR Studies at Cryogenic Temperatures

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    内容提示： Chapter 4Hydrogen Molecular Ions in Solid Parahydrogen: EPR Studies at Cryogenic TemperaturesJun KumagaiJ. Kumagai (?)Eco-Topia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japane-mail: kumagai@apchem.nagoya-u.ac.jpAbstract Electron paramagnetic resonance (EPR) spectroscopy for the assignment of H 6 + and its isotopomers, analysis of large precessional motion of them, and iso-tope condensation of H 6 + in solid parahydrogen at cryogenic temperature is treated in this chapte...

    文档格式：PDF | 页数：31 | 浏览次数：142 | 上传日期：2018-04-04 18:36:06 | 文档星级：
    Chapter 4Hydrogen Molecular Ions in Solid Parahydrogen: EPR Studies at Cryogenic TemperaturesJun KumagaiJ. Kumagai (?)Eco-Topia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japane-mail: kumagai@apchem.nagoya-u.ac.jpAbstract Electron paramagnetic resonance (EPR) spectroscopy for the assignment of H 6 + and its isotopomers, analysis of large precessional motion of them, and iso-tope condensation of H 6 + in solid parahydrogen at cryogenic temperature is treated in this chapter. The structure of H 6 + consisting of an H 2 + -core sandwiched with two side-on H 2 s is confirmed to have D 2 symmetry by the comparison of the experimen-tal hyperfine coupling constants (HFCC) with the theoretical ones. The substitution of one side-on H 2 with D 2 induced distortion of the spin density and nonequivalent HFCCs on the H 2 + -core indicating that the quantum effect due to nuclear motion cannot be ignored in this system. Rotational states of side-on D 2 and H 2 are attribut-able to J = 0 from the corresponding nuclear spin states of I = 0 and 0, 2 for H 2 and D 2 , respectively. The H 6 + ion migrates via hole hopping diffusion of H 2 + -core in solid parahydrogen, and turns into more stable H 4 D 2 + or H 2 D 4 + ion when it meets D 2 molecules. During the diffusion, H 6 + and H 4 D 2 + are in large precessional motion as indicated by an analysis of the anisotropic HFCCs.4.1 Properties of Solid ParahydrogenMany properties of solid hydrogen are summarized by Silvera and Kranendonk as a review [1] and a book [2], respectively, and important facts for the understanding of this chapter are extracted here from these sources. Solid parahydrogen (p-H 2 ) has various quantum effect features. Because of the small mass and the weak interac-tions, the rotational angular moment J of each hydrogen molecule is still a good quantum number in the solid [3]. The largest of the orientation-dependent interac-tions is the electric quadrupole-quadrupole (EQQ) interaction, which is in the order of magnitude of ~4 K. Because the EQQ interaction is much smaller than the rota-tional constant of H 2 ( B = 85.2 K), the rotational states of H 2 are almost undistorted by neighbors [1].117 © Springer International Publishing 2014A. Lund, M. Shiotani (eds.), Applications of EPR in Radiation Research, DOI 10.1007/978-3-319-09216-4_4

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