摘要
动态微扰可以引起跃迁率发生变化，产生光谱扩散，我们用ＭｏｎｔｅＣａｒｌｏ法模拟了由于频率变化引起的自由感应衰减和光子回波衰减，模拟的结果表明，衰减的线形只和频率变化与跳变速率的比值有关，根据它的不同取值，自由感应衰减呈指数和非指数形式，光子皮强度为ｅｘｐ（－（４τ／ｔｍ）＾ｘ），ｘ取值从１到３。我们还定性地讨论了红宝石中光子回波的非指数衰减。
Monte Carlo simulation has been carried out to get the free induction decay and photon echo decay for a system of A spins, isolated from each other, whose resonant frequency fluctuates because of the flipping of a surrounding B spins. We find that the decay line shape is dependent only on k, the ratio of the frequency fluctuation amplitude and twice of the average flip rate. The simulated photon echo decay can be expressed asexp[-(4τ/tm)x] where x ranges from 1 to 3. Nonexponential echo decay in ruby is alsodiscussed qualitatively.
出处
《发光学报》
EI
CAS
CSCD
北大核心
1996年第4期287-292,共6页
Chinese Journal of Luminescence
关键词
光失相
自由感应衰减
光子回波
dephasing, Monte Carlo simulation, free induction decay, photon echo
