From Almighty Scholar to Chief Scientist

Chapter 252 Controlling Interference and Diffraction!
The wavelength of X-rays is similar to the distance between the atomic planes inside the crystal. The crystal can be used as a spatial diffraction grating of X-rays, that is, when a beam of X-rays is irradiated on an object, it is scattered by the atoms in the object, and each atom produces a scattered wave. , these waves interfere with each other, resulting in diffraction.

When turning the crystal to face the angle of X-ray irradiation, the X-ray will change when it penetrates the inside of the crystal, zooming in and out.

According to this principle, Lin Xiao can design a crystal structure so that the interior can achieve the effect of orderly diffracting X-rays and when moving the crystal, the X-rays can be zoomed in and out.

If put in the past, this must be an extremely troublesome thing, requiring a large number of tests, the amount of calculation is also very high, and even supercomputing is required, and the cost that needs to be paid for this will be very high.

But now, because of his wave coherent superposition equations, this problem has been simplified infinitely, and there is no need to conduct a large number of tests. It is only necessary to write a program, and then according to the diffraction of X-rays inside the crystal effect, and then through the computer to perform calculations according to this program, he can easily obtain a complete result.

Of course, before that, he had to at least calculate the internal diffraction conditions of several other crystals to determine whether his wave coherent superposition equations were really useful.

Although after his complete calculation results, he can be sure that his calculation is correct, but who can know whether the actual situation is correct?

And this matter is not troublesome.

After leaving the house, he went directly to the research institute and came to the physics laboratory.

By the way, he called the intern researchers who conducted experiments with him before.

In fact, the team led by Lin Xiao can be regarded as a research group with funds, and these intern researchers are all paid.

As for the source of funding, it naturally comes from the research institute.

Lin Xiao's research institute has received strong support from the state, and in his opinion, the allocated funds are almost inexhaustible.

Let’s say that when the institute was just established, the state allocated 20 billion yuan to him, and asked him to see if there was any lack of equipment, and he could buy it if he wanted it, and apply for it if it was not enough.

It is precisely because of this that the Dingguang Research Institute has also attracted the attention of many researchers. Although the second recruitment has not yet been carried out, many people have expressed their desire to join.

However, these things all need Lin Xiao's approval, and he has no such plan for the time being.

Let's wait for him to finish his current work on these issues.

"The X-ray diffractometer has been adjusted, and now it is scanning the crystal number 1!"

"Scanning started!"

In the physics laboratory, several trainee researchers controlled the X-ray diffractometer in front of them and operated it.

In the diffractometer, a simple polished crystal has already been placed, and with the start of the X-ray diffractometer, the test will begin.

With the irradiation of X-rays, an image gradually appeared on the computer screen next to it, and what was displayed on the image was the result of X-ray diffraction inside the crystal.

Time passed slowly, and these intern researchers watched from the sidelines.

X-rays can hurt people, such as the CT room of a hospital, which will cause certain harm to the physical problems of the staff.

However, the diffractometer will not hurt people, and even if an X-lithography machine is made in the future, there is no need to worry about hurting the staff.

Because the X-rays in the CT room are originally used to irradiate people, the staff will inevitably be injured by those radiations when they are working.

The X-rays in the diffractometer are used to irradiate objects, so protective measures can be taken. Only a 1mm lead plate is needed to reduce the radiation to a level lower than that of mobile phones.

Therefore, there is no need to worry about the harm that X-ray lithography may cause to people. In fact, although extreme ultraviolet light is called ultraviolet light, it can actually be called soft X-rays. Protection, you don't have to worry about it at all.

So these researchers are not worried about being radiated while sitting next to them.

They looked at Lin Xiao over there, and were very curious about what he was going to do, so they all asked, "Professor Lin, what are we doing now? Are we going to start designing crystal structures?"

Lin Xiao, who was sitting on another computer, smiled and said, "Yes."

The trainee researchers were suddenly surprised: "Professor Lin, have you already clarified the law and reason of diffraction?"

"Basically." Lin Xiao replied, "So our job now is to verify my results."

The trainee researchers were even more amazed.

Professor Lin said that he found the law and reason of diffraction, can they say "impossible, this is absolutely impossible"?

They're not as sharp yet.

Of course, they also want to know what the law and reason are. Has Lin Xiao worked out the thesis yet?

However, Lin Xiao did not disclose it to them for the time being. Since he knows that this thing may be related to their domestic military development, he will first produce the paper and send it to relevant departments, such as those who specialize in military technology. Research institutions, let them see if there is any need for confidentiality.

Of course, after his theories are posted, there is no need to worry about whether they will be stolen. They are all recorded. The background is amazing?
Just think about who the senior party officials of their research institute are. The senior party officials of the Dingguang Research Institute have no one at their head, only the people.

Time passed quickly, and the X-ray diffraction scan took a long time, so they had been waiting, and Lin Xiao had been inputting a program before, and now, he finally completed the program.

This program is a program for simulating crystal X-ray diffraction based on the principle of Lin's wave coherent superposition equation.

As long as the wavelength, intensity, and incident angle range of X-rays are input, and then the crystal structure and refractive index of the crystal are input, the diffraction image of X-rays when penetrating the crystal can be obtained.

Afterwards, he entered various data of the crystal being detected in the X-ray diffractometer, and then pressed the Enter key.

Then, an XRD spectrum appeared in front of him.

The XRD pattern refers to the X-ray diffraction pattern, mainly wavy lines with abruptly rising peaks.

Through the analysis and calculation of these wavy lines, the crystal structure, texture and stress can be clarified.

And at this moment, the intern researchers over there suddenly shouted: "It's done! Professor Lin!"

"The analysis results are out!"

It turned out that the X-ray diffractometer scan was completed.

"Professor Lin, I want to send you the picture... um? When did you get the picture, Professor Lin?"

When an intern researcher turned his head to ask Lin Xiao, he suddenly discovered that an XRD pattern had appeared on his computer screen, wasn't it very similar to the analysis result in front of them?
Or should I say, exactly the same.

However, he has always been connected to the computer of the X-ray diffractometer. As a result, he hadn't sent it to Lin Xiao just after it came out. How could Lin Xiao have it?
Lin Xiao smiled: "This is the image calculated by my simulation."

Everyone present was stunned: "Analog computing?"

"Yes."

Lin Xiao nodded, smiled and spread his hands and said: "Didn't I tell you just now, I found the law and reason of interference and diffraction, so according to my results, as long as we know the internal structure of the crystal in advance, we can know its XRD pattern."

The people present were stunned when they heard this, but they hadn't reacted yet.

After knowing the crystal structure, can you then know its XRD pattern?

"Professor Lin, if we want to know the crystal structure, don't we have to analyze its XRD pattern first? If we all know the crystal structure, why bother with its XRD pattern?"

Lin Xiao smiled and said, "Everyone, don't forget our purpose, we want to build a crystal that can magnify and shrink X-rays!"

These researchers reacted immediately.

Yup!

The purpose of their research is not to analyze the crystal structure. The crystal structure they used was known before.

And the purpose of their experiment this time is to help Lin Xiao verify his results!

and so……

This result...

"Professor Lin, is the verification successful?"

Their eyes lit up, and they looked at Lin Xiao excitedly.

"Yes, it succeeded." Lin Xiao smiled slightly, "Of course, only the first crystal was successful, we still need to continue to verify more crystals, in addition, to confirm the error between my calculation results and your actual scanning results. "

"it is good!"

The researchers immediately went into action again.

There is a certain error between the actual XRD pattern of the first crystal and the XRD pattern calculated by Lin Xiao's simulation.

However, Lin Xiao believes that this error comes from the error of their X-ray diffraction machine itself.

And his calculation results are more accurate.

The calculation results are more accurate than the experimental results, and it does not exist. For example, when the industry studies turbulence problems, it often uses DNS and direct numerical simulation to solve NS equations. There are even a large number of examples that show that this calculation The reliability of the result exceeds that of the experiment. Of course, because the well-posedness of the solution of the NS equation has not yet been proved, it will still lead to the existence of errors.

Next, they went through several experiments to verify, without exception, they all proved that Lin Xiao's conclusion was correct, and although there were errors, these errors were all caused by the precision of the instrument itself.

All in all, Lin Xiao can officially announce——

He mastered interference and diffraction!
(End of this chapter)