KOH添加氷IhのNMR  [in Japanese] NMR study of KOH-doped ice Ih  [in Japanese]

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Abstract

KOH添加氷のNMR(パルス磁気共鳴吸収)の実験を行い,融点から100K(-173℃)間での陽子スピンー格子緩和時間:T<SUB>1</SUB>の測定を行った.励起周波数を16.1MH z,23.1MH z,31.0MH z,47.5MH zと変化させ応答の変化を調べた.<BR>T<SUB>1</SUB>の温度変化及び周波数変化の解析から, KOH添加氷の中にスピン温度の異なる二つのスピン系(陽子の運動状態が異なる)の共存が明らかとなり,更に得られた高温領域から低温領域へのスピン系間の結合係数(エネルギーの流れ)の変化と誘電緩和との対比から,KOH添加氷の誘電緩和におけるKOH添加固有の誘電緩和の生成・発達更には陽子秩序化の相転移に至る過程を理解するための有意な情報が得られた.

Spin lattice relaxation time T<SUB>1</SUB> in KOH-doped ice was measured with the pulse NMR method between the temperature range from just below melting point to 100K(-173°C).The excitation magnetic frequencies were 13.1, 24.1, 31.4 and 47.5 MHz. Temperature and frequency dependence of T<SUB>1</SUB> was successfully analyzed using two spin systems which have different proton motion states. Comparison of the temperature dependence of the coupling constant between two spin systems and that of the dielectric relaxation showed that the rapid dielectric relaxation excited by KOH doping corresponds to the transfer motion of protons on the hydrogen bond and is stabilized below about 200K.

Journal

  • Journal of the Japanese Society of Snow and Ice

    Journal of the Japanese Society of Snow and Ice 64(3), 223-231, 2002-05-15

    The Japanese Society of Snow and Ice

References:  18

Codes

  • NII Article ID (NAID)
    10008434352
  • NII NACSIS-CAT ID (NCID)
    AN00131221
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    03731006
  • NDL Article ID
    6169940
  • NDL Source Classification
    ZM43(科学技術--地球科学--気象)
  • NDL Call No.
    Z15-23
  • Data Source
    CJP  NDL  J-STAGE 
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