transition n. 轉(zhuǎn)變,演變,變遷,變化;飛越;過渡期;【音樂】變調(diào),轉(zhuǎn)調(diào);【修辭學(xué)】語次轉(zhuǎn)變;【語法】轉(zhuǎn)換;【物理學(xué)】躍遷;【地質(zhì)學(xué);地理學(xué)】轉(zhuǎn)移層;【建筑】(式樣、時(shí)期等的)過渡。 forced transition 【物理學(xué)】受迫躍遷。 a transition period [stage] 過渡時(shí)期[階段]。 an age of transition 過渡期。 -al, -ary adj.,-ally adv.
It is the main purpose of this paper to calculate the energy splitting of ground state and excited states induced by thermally assisted quantum tunneling . first , a brief introduction is given for the theoretical and experimental studies on the magnetic macroscopic quantum effects . then , spin tunneling in a uniaxial ferromagnetic particle in transverse magnetic field is converted to a pseudoparticle moving in effective double - well potential with the help of the effective potential description of quantum spin systems developed by ulyanov and zaslavskii . finally using the periodic instanton method we evaluate the transition amplitude , energy shift and prefactor of wkb exponential and the energy splitting of ground state and the tunneling rate for excited states induced by thermally assisted quantum tunneling are obtained 文章首先對(duì)磁性宏觀量子效應(yīng)的理論和實(shí)驗(yàn)方面作了簡(jiǎn)單介紹,然后借助于ulyanov和zaslavskii發(fā)展的一種等效勢(shì)描述方法,把外磁場(chǎng)沿難磁化軸方向時(shí)的自旋隧穿約化成在等效雙勢(shì)阱中運(yùn)動(dòng)的粒子,利用瞬子方法給出基態(tài)能級(jí)劈裂,最后利用周期瞬子方法分別計(jì)算了隧穿幅、能級(jí)移動(dòng)以及wkb前因子,從而給出由于熱助量子隧穿引起的激發(fā)態(tài)的隧穿率。