Luminescence and characteristics of electron-holeplasma created in wide-band-gap crystals by ion irradiation.

我们感兴趣的是重离子的高密度激发，这是目前方法中最高的激发。对于宽禁带绝缘体的激发，重离子束流的激发密度比太瓦激光高3/3。为了寻找离子辐照特有的现象并阐明离子径迹在初始阶段的动力学。我们发展了一种单离子和单光子符合技术。目前，时间分辨率约为85ps，这是最快的工具，也是。至少在顺序上比通常的离子技术更好。通过SISP的应用，我们发现了许多绝缘体晶体普遍存在的超快发光。这种笨拙还没有被观察到，也不能用到目前为止的理解来解释。我们提出了电子-空穴等离子体作为快速发光的来源，其证据表明：无尾快速衰减，超线性激发密度与产额的关系，样品与产额的关系，以及温度的影响很小。然而，肯定还有许多未知的特征正在重新出现。绝缘子中的e-h等离子体，考虑到绝缘子中的e-h等离子体是最早的发现和起点。此外，到目前为止，我们的TIRNE分辨光谱容易受到光束涨落的影响。为了克服这一周点，获得精确的光谱，我们计划同时构建8个波长的SISP和NBW。然而，离子加速器自去年4月以来一直在重建中。我们正在等待加速器的运行。

We are interested in high-density excitation by heavy ions, which is the highest exclitation in the present methods. In case of excitation of insulators with wide band-gaps, the intensity of excitation density by heavy ibns is three ofders higher thap tera W laser. In order to search phenomena characteristic to ion irradiation and elucidate dynamics of ion-tracks at initial stages. we developed a single ion and single photon (SISP) coincidence techaiques. At present, the time resolution is about, 85 ps, which is the fastest tool and is. better at least by order than usual techniques for ions. By application of SISP, we found ultra-fast luminescence commonly for many insulator crystals. Such lumjnescence has been not oberved and cannot be explained by so-far understanding. We proposed electron-hole plasma as origin of the fast luminescence with showimg evidences : non-tailed fast decay, super-linear excitation-density dependence of yield, sampl e dependence of yield, and little influence of temperaturle. However, there must be yet many unknown chaiacteristics regaiding with. e-h plasma in insulators, considering that e-h plasma in insulators is the frst finding and at starting point. Ih addition, so far our tirne-resolved spectra were apt to be influenced by beam fluctuation In order to overcome this week point and obtain precise spectra, we planed to construct simultaneous 8-wavelengths SISP and nbw this system is ready to measurements. However, the ion accelerator is in reconstruction since the last April. We are waiting the operation ofthe accelerator.