摘要
我们首先介绍了氢键系统的特性和质子在此系统中的运动特点及国际上对此问题研究的进展和存在的问题。接着较全面地描述我们提出的新理论的物理学基础、模型的特征和所形成的两类缺陷和质子孤子的特性。这个模型的最大特点是存在两类不同性质的非线性相互作用 ,它们之间的竞争和平衡导致了两类不同的缺陷和相应孤子的出现 ,这两类缺陷的协同和交替运动使质子在氢键系统中从一处传递到另一处。因此 ,此模型能完整地解释质子在氢键系统中的传递 ,在此基础上我们研究了重离子作非简谐振动和系统中存在的杂质及氢离子的迁移所产生的偶极矩等效应对质子孤子的影响以及在外场存在时 ,质子运动的特点 ,求出了质子在电场作用下的迁移率和传导率、大约分别为 (6 5 - 6 .9)× 1 0 - 6(m2 /v .s)和(7.6 - 8.1 )× 1 0 - 3/(Ωm) ,它刚好处在半导体范围内 ,与实验结果基本吻合。
We introduced, first of all, the features of structrue of hydrogen bonded systems and properties of motions of the protons in it, and reviewed the situations and difficulties of theoretical investigation to these problems. However, we described completely the physical foundation and properties of new model proposed by us and features of two kind of different defects and corresponding proton?solitons. An important characteristic of the new model is that there are two kinds of differently nonlinear interactions in the systems which result in two sorts of different defects and corresponding solitons to occur under competition between them. The coordinutions and alternate motions of the two kind of defects or solitons facilitate the proton's transfer from one place to another in the systems. Therefore, the new model can completely explain the proton's transfer in the system. Based on these results we study continuously influences of anharmonant vibrations of heavy ions and impurities inserting in the systems and dipole?dipole interaction resulting from the migration of protons and externally applied field on the properties of the proton?soliton. We have found out the shift rate and corrsponding conductivity of the transfer of the protons in the systems, when the applied electric field is weak, which are(6.5-6.9)×10 -6 (m 2/v.s) and (7.6-8.1)×10 -3 /(Ωm) in ice, respectively. These resalts are basically consistent with experimental data. We study further the quantum mechanical properties of the proton?soliton and find out the critical temperature of the soliton in the systems at finite temperature.
出处
《物理学进展》
CSCD
北大核心
2002年第2期214-248,共35页
Progress In Physics
基金
国家自然科学基金的资助 (基金编号为 1 99740 3 4 )
