本論文包含下列四個研究：一、利用[N(CH3)3]+自由基研究TrMCC晶體低
溫相中TrM離子位置性無序的現象。二、利用[N(CH3)3]+自由基研究TMCC
晶體的結構相變與雙晶現象。三、摻入V4+離子的KTP晶體內，V4+離子佔
據位置的研究。四、經uv照射產生，焦硫酸銨晶體產生自由基對的研究。

The thesis includes the following four researches: 1.Two
chemically inequivallent [N(CH3)3]+ radical species produced
via r-irradiation were detected by EPR in TrMCC crystal. This
indicates a twofold, static disorder of the TrM ions. 2.The
hexagonal P63/m to monoclinic P21/m structural phase transition
in TMCC has been investigated by EPR. The result indicates the
presence of merohedral twinning below the phase transition.
3.Two chemically inequivallent V4+ ions were detected by EPR in
vanadium-doped KTiOPO4 crystal. The results allow one to
identify the occupation sites of the doped V4+ ions and to
conclude that the doped V4+ ions form VO2+ ions. 4.Irradiation
of (NH4)2S2O8 single crystal with uv light produces two kinds
of radical pairs, pairs I and pairs II. Radical pairs I is
stable at room temperature, and can be identified to be SO5-
pairs. Radical pairs II can be produced by uv-irradiation and
detected by EPR only at low temperatures and identified to be
SO4- pairs.
The thesis includes the following four researches: 1.Two