"Is this here?"

"It should be here"

"I wish it was here!"

Xu Mang was standing in front of an office. He wanted to take a look at the scanning tunneling microscope, and Oxford University happened to have a scanning tunneling microscope. The key was in the hands of Professor Matri.

Bang bang bang,

After saying "please come in",

Xu Mang hurriedly pushed the door open and saw a middle-aged woman standing in front of a blackboard with various calculations written on it.

"Huh?"

"Professor Xu?"

When Ma Li saw it was Xu Mang, she couldn't help but be stunned for a moment, then put on a smile and asked: "Does Professor Xu have anything to do with me?"

"hey-hey"

"Hello, Professor Matri." Xu Mang said with a smile: "I am mainly looking for you to learn about the scanning tunneling microscope."

"Scanning tunneling microscope?"

"Is this related to the gaseous carbon ring you are studying?" Professor Matri asked curiously.

"There is no necessary contact, just pure curiosity and wanting to know something." Xu Mang said with a smile: "I don't know if Professor Matri is willing. I think this request should be very simple, not difficult."

Matri nodded and said seriously: "It is rare for Professor Xu to speak, so I will help you do it no matter what."

moment,

Matri took Xu Mang to the laboratory.

At first I thought I needed to walk a distance, but in the end I just opened the door and walked to the door on the opposite side.

Xu Mang probably knew about the scanning tunneling microscope before. A probe slowly passes through the material to be analyzed, an electric charge is placed on the probe, and a current flows from the probe, through the entire material, to the underlying surface.

As the probe passes over individual atoms, the amount of current flowing through the probe varies, and these changes are recorded.

The principle is that the electric current rises and falls when flowing through an atom, so that its outline can be detected in extremely detail. By plotting the fluctuations in the amount of electric current, humans can then obtain the grid structure diagram of a single atom.

I understand the truth,

But understanding and operating are two different things. Just like Xiaoman knows that he is an airport, and he also wants to be bigger, but this does not mean that he is big. There is a process from ordinary to big. Even if he has read a lot of books, tell Xiaoman

There are many techniques for getting bigger, but they are not easy to implement.

theory and practice,

no the same!

"STM has two working modes, constant current mode and constant height mode. Under normal circumstances, the constant current mode is used. This working method obtains comprehensive image information and high quality microscopic images."

"Of course, the constant height mode also has the feature of acquiring microscopic images through tunneling current without the need for a light source and lens."

pause for a moment,

Matri continued: "STM has several functions. I won't talk about scanning. In addition to scanning, STM can be used to find defects and damage in various structures on the surface, and use methods such as surface deposition and etching.

Establish or cut off connections to eliminate defects and achieve the purpose of repair, that is, flaw detection and repair."

Xu Mang nodded repeatedly. At this time, he had already turned on the memory mode, memorizing everything Matri said in his mind, and copying the basic parameters in the manual.

"Professor Mattley?"

"Where did you buy this equipment?" Xu Mang asked: "It seems like it was built by myself."

"right!"

"We provide the drawings, and then the School of Engineering helps us build them." Matri said with a smile: "This STM has almost one of the highest resolutions in the world. It has won the Best Innovation Award and has helped many Nobel Prize winners in their research.

experiment."

""

"sharp!"

Xu Mang was immediately filled with envy. Looking at this unattractive man, he suddenly became confused.

copy!

Make a complete copy of the most powerful microscopy tool in the world, and then bring it back to build it yourself to avoid being blocked by others' technology in this regard.

"well?"

"Is this part shock-absorbing?" Xu Mang asked.

"right!"

"Because the working distance is less than one nanometer, and the tunnel current is exponentially related to the tunnel gap, any vibration will cause instability. Vibration and impact must be isolated, and vibration must be isolated!" Matri said: "How to reduce shock specifically?

, I can’t say it, it’s a secret.”

Xu Mang showed a smile and nodded to Matli: "I understand."

actually,

At this time, Xu Mang probably guessed that how to reduce shock could not be achieved by relying on the spring itself. He probably had to consider the frequency of external vibrations and the natural frequency of the instrument, and coordinate the two frequencies to a single value.

after all,

It's easy to do via computer.

Immediately afterwards,

Xu Mang asked a lot of questions, but Professor Matri only gave a general summary of the content, with some reservations about Xu Mang. However, in many cases, Xu Mang was able to guess everything, and in very few cases, he was completely different.

Know.

The parameter setting of this function is completely confidential.

In this regard,

Xu Mang had no choice but to accept that although there must be a scanning tunneling microscope in China, the resolution was not as high as this. As a result, compared with foreign countries, it was at a disadvantage when it came to studying atoms.

Back at Matri's office, Xu Mang chatted with her for a while and then noticed the calculation process on the blackboard.

"Professor Matri is studying the single resonance model to study the characteristics of medium dispersion, right?" Xu Mang asked with a smile.

After hearing Xu Mang's words, Matri's face changed slightly and she nodded: "That's indeed the question. I didn't expect that Professor Xu also knows a lot about electromagnetism and electrodynamics!"

“It’s okay”

"It seems like the calculation process is stuck, right?" Xu Mang said, "It's quite normal to be stuck here."

""

Matri said nothing. She suddenly realized that the person sitting in front of her was not an ordinary person. He was a man who had applied mathematics to the extreme.

perhaps,

The problems he encountered were not problems at all in Professor Xu's eyes.

After all, not everyone can discover the essence of the problem at a glance.

"Professor Xu"

"Can you help me solve it?" Professor Matri's attitude became somewhat respectful.

"all right!"

"This question is not difficult, at least it is not difficult for me." Xu Mang said with a smile: "But I really want to know the parameter settings of stm. Of course, I just took a look to get a rough idea."

Matri thought for a long time. Normally she would refuse, but the person sitting across from her was not an ordinary person, and she couldn't treat him with ordinary circumstances.

"good!"

The words fell,

Matri took out a notepad, handed it to Xu Mang, and said seriously: "This is the specific parameter setting."

Xu Mang smiled and said thank you.

"The system turns on memory mode!"

【Memory mode start】

"The system turns on beast mode!"

[Beast mode activated]

after,

Xu Mang frantically flipped through the parameter settings above, not to mention how detailed they were.

After seeing Xu Mang's speed, Ma Li was completely relieved. She was really just flipping through it casually. If she could remember everything at this speed, then this world would be too dangerous.

Less than ten minutes,

Xu Mang handed the notepad back to Matli and said with gratitude: "Thank you."

"No no no!"
To be continued...