secondary emission

简明释义

二次发射

英英释义

例句

1.The process of detecting particles often relies on the phenomenon of secondary emission.

检测粒子的过程通常依赖于二次发射现象。

2.In electron microscopy, secondary emission can enhance image resolution.

在电子显微镜中，二次发射可以增强图像分辨率。

3.The secondary emission effect is crucial in developing better vacuum tubes.

二次发射效应在开发更好的真空管中至关重要。

4.Researchers are studying how secondary emission impacts surface conductivity.

研究人员正在研究二次发射如何影响表面导电性。

5.The efficiency of photodetectors can be affected by the rate of secondary emission.

光电探测器的效率可能受到二次发射速率的影响。

作文

The concept of secondary emission plays a crucial role in various fields, particularly in physics and materials science. To understand this phenomenon, we must first define what secondary emission is. In simple terms, secondary emission refers to the process where incident particles, such as electrons or photons, strike a material and cause the ejection of additional particles from that material. This process is significant in many applications, including photodetectors, electron multipliers, and even in the development of certain types of displays.One of the most common examples of secondary emission can be observed in cathode ray tubes (CRTs), which were widely used in televisions and computer monitors before the advent of modern display technologies. In CRTs, an electron beam strikes a phosphorescent screen, causing it to emit light. The initial electrons not only illuminate the screen but can also cause the release of additional electrons from the screen's surface, illustrating the principle of secondary emission. In the realm of materials science, understanding secondary emission is essential for developing new materials with enhanced properties. For instance, researchers often study the secondary emission characteristics of different materials to create more efficient photovoltaic cells. By selecting materials that exhibit high secondary emission, scientists can enhance the overall efficiency of energy conversion in solar panels.Moreover, secondary emission is not just limited to solid materials; it can also occur in gases and liquids. In gas discharge tubes, for example, when ions collide with the electrodes, they can cause the emission of secondary electrons. This phenomenon is vital for the operation of devices such as gas lasers and ion thrusters used in space exploration.Another important application of secondary emission is in the field of particle detectors. These detectors rely on the ability of materials to emit secondary particles when struck by primary particles. For example, in a typical particle detector, the interaction between incoming particles and the detector material results in the generation of secondary emissions, which can then be measured to infer the properties of the original particles. This process is fundamental in high-energy physics experiments, where understanding particle interactions is key to uncovering the mysteries of the universe.In conclusion, secondary emission is a multifaceted phenomenon with significant implications across various scientific disciplines. From enhancing display technologies to improving energy conversion systems and facilitating particle detection, the study of secondary emission continues to yield valuable insights and advancements. As technology progresses, further exploration of secondary emission will undoubtedly lead to innovative applications that can transform our understanding and utilization of materials in both existing and emerging technologies.

“二次发射”这一概念在多个领域中扮演着关键角色，特别是在物理学和材料科学中。要理解这一现象，我们首先必须定义什么是“二次发射”。简单来说，“二次发射”指的是入射粒子（例如电子或光子）撞击材料并导致额外粒子从该材料中逸出的过程。这个过程在许多应用中具有重要意义，包括光电探测器、电子倍增器，甚至在某些类型显示器的发展中。“二次发射”的一个常见例子可以在阴极射线管（CRT）中观察到。在现代显示技术出现之前，CRT广泛用于电视和计算机显示器。在CRT中，电子束撞击荧光屏，导致其发光。初始电子不仅照亮屏幕，还可能导致屏幕表面释放额外的电子，这说明了“二次发射”的原理。在材料科学领域，理解“二次发射”对开发具有增强特性的材料至关重要。例如，研究人员经常研究不同材料的“二次发射”特性，以创建更高效的光伏电池。通过选择表现出高“二次发射”的材料，科学家可以提高太阳能电池中能量转换的整体效率。此外，“二次发射”不仅限于固体材料；它也可以发生在气体和液体中。例如，在气体放电管中，当离子与电极碰撞时，它们可以导致电子的二次发射。这一现象对气体激光器和用于太空探索的离子推进器等设备的运行至关重要。“二次发射”的另一个重要应用是在粒子探测器领域。这些探测器依赖于材料在受到主要粒子撞击时发出二次粒子的能力。例如，在典型的粒子探测器中，入射粒子与探测器材料之间的相互作用会导致二次发射的生成，从而可以被测量以推断原始粒子的性质。这个过程在高能物理实验中是基础，因为理解粒子相互作用对于揭示宇宙的奥秘至关重要。总之，“二次发射”是一个多方面的现象，在各个科学学科中具有重要意义。从增强显示技术到改善能量转换系统，再到促进粒子探测，“二次发射”的研究持续带来有价值的见解和进步。随着技术的进步，对“二次发射”的进一步探索无疑将导致创新应用，这将改变我们对材料的理解和利用，无论是在现有技术还是新兴技术中。