布拉格印象英文怎么读

衍射出现在满足布拉格条件的角度上,这可以理解.但是,X射线衍射是因为X射线与原子发生弹性碰撞,原子向四面八方散射频率相同的X射线,书上讲的衍射方向都是与入射方向夹角为2西塔,难道就不可能在其他方向上（即入射角和反射角不相等）恰好满足布拉格条件吗?
恰好满足布拉格条件的就是2θ方向.在其他方向（即入射角和反射角不相等）上的也有,但都被许许多多散射光之间相互抵消、成为光强很弱甚至为0的图案、成为观测区域内的背景.
晶体的格子结构是一种光的理想栅栏,X射线先照射上去后形成许许多多相干光,从而再形成干涉.其中相位合适、即符合布拉格条件的位置出现强亮斑点,若接收为X-Y函数就是强峰.这些强亮衍射斑点立体地构成一个三维网.所有干涉强光相加成为最强光的地方（斑点）都是在衍射角为2θ的位置上,其它位置上的散射光因为不是强强叠加、都被相互抵消!这是物理学上已经被证明了的.
注意,衍射角不是入射角.注意由于实验方法和观测方式的不同,所获得的图案可以是斑点、连续的亮线、断续的亮线等.

Prague, the capital of Czech,situated in the west of Czech, lies on the Vltava River, a branch of the Labe River. It is a beautiful ancient mountainous city. The Vltava River like a green gady belt divides the city into two, while the old bridges bond them together tactfully. Standing downtown, Mount 伯特日娜 is a peaceful place for leisure with lush arbors and enjoyable scenery. Whether they are Romanesque, Gothic, Baroque or Renaissance style, the steepled or domed tower-type archaic buildings are still intact. The high-rise and low-rise spires join together, looking like an ocean of towers, so Prague enjoys the name of "City of a Hundred Spires". The city is also called "Golden Prague" forits splendidness in the sunshine.

Czech 音标不回答,发音和check一样
Prague [pra:g]

代表一个Na原子或者一个Cl原子
NaCl是离子晶体,不 存在NaCl分子

实际上,布拉格公式2dsintheta=n入,表示的是,如果两个原子之间的距离引起的散射线的光程差正好等于入射X射线的波长的整数倍时,那么散射线就会发生相干,也就是出现衍射现象.同时,如果n不同,那么衍射线方向也就不同.所以,把n放到d的下面变成不同的D,更容易在衍射图谱上表现出不同的衍射面与入射X射线的对应关系.

The Czech capital,Prague,in the western border,is located in the Labe River tributaries cross-strait Thawat Mi Fu,a population of about 1.21 million,the United States is an ancient mountain Brill.V Mi Thawat River recorded as a color jade belt,the city will become divided into two parts.Dou Wei along both sides of the Shanbi gradually disappeared in the remote wilderness,the ups and downs.Across the river on several of the 10 ancient and modern bridge,Majestic,the two cities will coordinate cleverly united as one.Burt stands in the urban area,Na Mountains,lush trees,beautiful scenery and quiet environment is a place of rest.Urban those with the spire or tower dome old buildings,whether it is Romanesque,Gothic,Baroque-style,or Renaissance,a well preserved,with Baroque or Gothic - the largest number of the most famous,most of them churches.Gaogaodidi the tip,into an adjoining Tallinn,thus Prague "100 Tower City," said.In the sun shine,"100 Tower" is splendid,which is also known as the "golden Prague."

Charles Bridge (Czech:Karlův most listen (help·info)) is a famous historical bridge that crosses the Vltava river in Prague,Czech Republic.Absolute Location:50°5′11.21〃N 14°24′42.68〃E / 50.0864472,14.4118556.Its construction started in 1357 under the auspices of King Charles IV,and finished in the beginning of 15th century.As the only means of crossing the river Vltava (Moldau),the Charles Bridge used to be the most important connection between the Old Town,Prague Castle and adjacent areas until 1841.Also this 'solid-land' connection made Prague important as a trade route between east and west Europe.The bridge was originally called the Stone Bridge (Kamenný most) or the Prague Bridge (Pražský most) but has been the "Charles Bridge" since 1870.
The bridge is 516 meters long and nearly 10 meters wide,resting on 16 arches shielded by ice guards.It is protected by three bridge towers,two of them on the Lesser Quarter side and the third one on the Old Town side.The Old Town bridge tower is often considered to be one of the most astonishing civil gothic-style buildings in the world.The bridge is decorated by a continuous alley of 30 statues and statuaries,most of them baroque-style,erected around 1700.
During the night Charles Bridge is a quiet place.But during the day it changes its face into a very busy place,with painters,owners of kiosks and other traders alongside numerous tourists crossing the bridge.

背信弃义
狼心狗肺
吃里爬外

就是一个地方,正常人把捷克首都叫布拉格,不正常的人却称之为布卡格,以至把另外一些正常都闹糊涂了.

这是一个马上到期的问题.
布拉格公式：
2d sin θ = nλ,
式中,λ为X射线的波长,λ=1.54056 Å,
衍射的级数n为任何正整数.
温度升高,对于一般的晶体而言,大都是热胀冷缩的.升高温度使晶体膨胀,晶面间距d增大.测试用X射线波长λ不变.衍射角2θ应该减小.
测试用X射线源改变,X光波长λ改变.同样的被测试晶体,晶面间距d值一定,λ增大,θ和衍射角2θ也随之增大；波长λ减小,θ和衍射角2θ也随之减小.

布拉格方程是给出晶体X射线衍射方向的方程.2dsinθ=nλ 　　d为晶面间距,θ为入射束与反射面的夹角,λ为X射线的波长,n为衍射级数,其含义是：只有照射到相邻两晶面的光程差是X射线波长的n倍时才产生衍射.
这是物理光学衍射产生的必要条件,符合条件的晶面可通过调波长或入射角度来获得衍射图样.

The sphinx is a very famous monument in Egypt that almost every tousist there goes to see.According to archaeologists,the Great Sphinx of Gize was probably the first sphinx made.Over thousands of years,and covered the Sphinx until only the head was visible.people forgot that the head represented a Pharaoh,and they began to worship the Sphinx as Ra,the sun god.In fact,the name"sphinx' is not Egyptian,but from the Greak word meaning"strangle".According to legend,the Sphinx strangle and killed anyone who could not make sense of her riddle.

Came to the Czech Republic, had the place to go is its capital, Prague

λ取靶材料的特征谱线波长,比如Cu靶,取它的Kα1波长.
电子轰击靶材后同时放出X射线的连续谱和特征谱,连续谱的波长才是你说的混合了各种波长,这种只是造成了背底,并不会产生衍射.而特征谱线的波长是一定的,只和X射线光管的阳极靶是何材料有关,一般都会取Kα1的,查一下代入公式就行了

散射啊!

I want to go to Prague with you

查理大桥 Charles Bridge
布拉格城堡 Prague Castle