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These interference effects are useful for determining dimensions in solid materials, and therefore crystal structures. Since the distances between atoms or ions is on the order of 10-10 M (1 Å), diffraction methods require radiation in the X-ray region of the electromagnetic spectrum, or beams of electrons or neutrons with a similar wavelength. Electrons and neutrons are commonly thought of as particles, but they have wave properties with the wavelength depending on the energy of the particles as described by the de Broglie equation . The three diffraction methods have different properties that are described in more detail in separate documents. For example, the penetration depths of the three types of beams are quite different: neutrons > X-rays > electrons.

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M.2模块的外形是长方形，在短邊一侧有一个连接器（臺灣俗稱「金手指」，有最多67针的75个点位，0.5毫米间距，各针分布在PCB的两短邊），并在另一侧短边的中心有一个半圆形安装固定孔。连接器上的各引脚额定最多50V和0.5A，而连接器本身要求耐受最低60次拔插。M.2标准允许模块寬度为12、16、22和30毫米，長度16、26、30、38、42、60、80和110毫米。市售M.2 擴充卡主要是22毫米寬度，長度有30、42、60、80和110毫米等规格[2][4][10][13]。對於固態硬碟適用的 M.2 模組，最常見的尺寸為 22mm (寬) x30mm (長)、22mm x 42mm、22mm x 60mm、22mm x 80mm 和 22mm x 110mm。這些擴充卡將會依據上述的尺寸來稱呼：前兩位數代表寬度 (都是 22mm)，而剩餘的位數則是代表長度，從 30mm 起到 110mm 長。因此，M.2 固態硬碟被區分為 2230、2242、2260、2280 和 22110[14]。

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Diffraction is a wave property of electromagnetic radiation that causes the radiation to bend as it passes by an edge or through an aperture. Diffraction effects increase as the physical dimension of the aperture approaches the wavelength of the radiation. Diffraction of radiation results in interference that produces dark and bright rings, lines, or spots, depending on the geometry of the object causing the diffraction. Common interference effects for visible light are the rainbow pattern produced by an oil film on wet pavement and the diffraction of light from a narrow slit or a diffraction grating. Diffraction Methods

M.2模块的PCB板提供最多75個點位的连接器；取决于模块类型，部分针位被去除以存在一个或多个防呆鍵位。主机上的M.2连接器（插槽）可能填充一个或多个匹配的接口，这取决于主机可接受的模块类型；截至2014年4月，主机侧的连接器可以只填充一个防呆鍵位（无论B key或 M Key）[4][10][16][17]。此外，用于SATA或双通道PCI Express (PCIe ×2)的M.2插槽被称为"socket 2 configuration"或者"socket 2"，用于四通道PCI Express (PCIe ×4)的插槽被称为"socket 3 configuration"或"socket 3"[1][18]。

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Socket 1主要針對無線網卡，對應的防呆鍵位為A Key。M.2 SSD 主要適用於 Socket 2、Socket 3這兩種插槽，Socket 2插槽可以支援走 SATA 及 PCIe x2通道的M.2 SSD，所對應的鍵位為 B Key，而 Socket 3插槽則支援走 PCIe x4通道的M.2 SSD，對應的鍵位為 M Key，兩種插槽因為防呆缺口的位置不一樣，所以無法混用，不過市面上有些 M.2 SSD 產品為了能同時兼容於兩種插槽，便把金手指的部分設計成 B+M Key 的形式，但是能夠插得進去，不代表就能夠正常使用，因為某些主機板上的M.2插槽僅能支援 PCIe 通道，如果你插入 SATA 的M.2 SSD，那麼就會無法偵測到，除非廠商在設計時，就已經加入 SATA 及 PCIe 的控制器，使它能夠兼容於兩者，這部分各家不一，只能從主機板規格表上自行查詢。另外，如果是走 SATA 通道的M.2 SSD，那麼一樣會受到6Gb/s 頻寬的限制，在傳輸效能上等同於2.5吋的 SATA SSD[20]。

A certain wavelength of radiation will constructively interfere when partially reflected between surfaces that produce a path difference equal to an integral number of wavelengths. This condition is described by the Bragg law: n = 2dsin where n is an integer, lambda is the wavelength of the radiation, d is the spacing between surfaces, and theta is the angle between the radiation and the surfaces. This relation demonstrates that interference effects are observable only when radiation interacts with physical dimensions that are approximately the same size as the wavelength of the radiation.

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What is a Collimated Beam. Beam. A collimated beam is light with weak divergence, meaning it's a flow of photonics that move in parallel to one another, without ...

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