I really don't want to lie down and win

"hey-hey..."

"Hello, Professor Martelli." Xu Mang said with a smile, "I'm looking for you mainly to learn about scanning tunneling microscopes."

"Scanning tunneling microscope?"

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

"There is no necessary contact, just pure curiosity, and I want to know more about it." Xu Mang said with a smile, "I don't know if Professor Martelli would like it. I think this request should be very simple, not very difficult..."

Martelli nodded, and said seriously: "Professor Xu rarely speaks, so I will help you do it no matter what."

moment,

Matley took Xu Mang to the laboratory.

At first I thought I needed to walk for a while, but in the end I opened the door and walked into the opposite door.

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

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

The principle is that when the current flows through an atom, it rises and falls, so that its outline can be detected in great detail. By drawing the fluctuation of the current, human beings can obtain the grid structure diagram of a single atom.

I understand the truth,

But understanding and operating are two different things. It seems that Xiaoman knows that he is an airport and wants to become bigger. Man has a lot of techniques for getting bigger, but it's a big deal when it's operable.

theory and practice,

Different!

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

"Of course...the constant-height mode also has characteristics, and the microscopic image is obtained through the tunnel current without the need for a light source and a lens."

pause for a moment,

Martelli went on to say: "STM has several functions, and I won't talk about scanning. In addition to scanning, STM can be used to find defects and damage on various structures on the surface, and use methods such as surface deposition and etching. Make or cut the connection to eliminate the defect and achieve the purpose of repair, that is, flaw detection and repair.”

Xu Mang nodded again and again. At this time, he had already activated the memory mode, memorized all the content that Martelli said in his mind, and copied the basic parameters on the manual by the way.

"Professor Martelli?"

"Where did you buy this device?" Xu Mang asked, "It seems...it looks like it was made by myself."

"Correct!"

"We provide the drawings, and then the School of Engineering helps us make them." Martelli said with a smile: "This STM is almost one of the highest resolutions in the world. experiment."

"..."

"Great!"

Xu Mang was immediately envious, looking at this unattractive iron bump, he instantly started thinking about it.

copy!

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

"Ugh?"

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

"Correct!"

"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. It is necessary to isolate the vibration and impact, and the vibration must be isolated!" Martelli said: "How to reduce the vibration? , I can’t tell, it’s a secret.”

Xu Mang showed a slight smile, and nodded at Ma Terry: "I can understand."

in fact,

At this time, Xu Mang probably guessed how to absorb the shock, which cannot be done by relying on the spring itself. It is estimated that the frequency of the external vibration and the natural frequency of the instrument were cut in, and the frequencies of the two were coordinated to a value.

after all,

It's easy to do with a computer.

Then,

Xu Mang asked a lot of questions, but Professor Martelli only talked about the general content, with some reservations about Xu Mang. Know.

This function parameter setting... Martelli is completely confidential.

For this,

Xu Mang had no choice but to accept it. Although there must be a scanning tunneling microscope in China, the resolution is not as high. As a result, compared with foreign countries, he is at a disadvantage in studying atoms.

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

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

After hearing Xu Mang's words, Matelli's expression changed slightly, she nodded and said, "That's indeed the question. I didn't expect Professor Xu to know a lot about electromagnetism and electrodynamics!"

"Okay..."

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

"..."

Martelli didn't speak, and she suddenly realized that the person sitting in front of her was not an ordinary person, but a man who used mathematics to the extreme.

perhaps,

The problem I encountered was not a problem at all in the eyes of Professor Xu.

After all, it is not possible for everyone to discover the essence of the problem at a glance.

"Professor Xu..."

"Can you help me with this?" Professor Martelli's attitude became somewhat respectful.

"Yes you can!"

"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 take a look to get a general idea."

Matley pondered for a long time, and generally refused, but the person sitting across from her was not an ordinary person, and she couldn't be treated with ordinary circumstances.

"it is good!"