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Immediately afterwards, Deng Hang demonstrated some more complex operations to Ning Chen.

Compared with the previous basic operations, these operations involved more steps and skills, which also required Ning Chen to concentrate more in order to remember the details.

But after several times of practice, Ning Chen quickly mastered these more complex operations, which made Deng Hang stunned.

This feeling is like a driving school instructor teaching a student who has never touched a car to practice driving. After a few hours, the student can hit the road on his own, which is incredible.

"Teacher Deng, when can we start the formal experiment?"

Seeing that he had nothing more to teach Ning Chen, Deng Hang agreed:

"If you're ready, you can start experimenting."

Originally, Deng Hang had already made preparations and spent two or three days teaching Ning Chen to familiarize himself with the equipment, and even helped Ning Chen do the experiment himself.

Now it seems that Deng Hang himself worried too much.

After getting Deng Hang's permission, Ning Chen also made preparations to officially start the experiment.

Since this experiment has a great relationship with his future projects, Ning Chen definitely hopes that he can participate more and even lead the experiment.

After making preparations, Ning Chen first put the various superconducting materials synthesized before into the furnace.

Next, Ning Chen adjusted the conditions in the furnace and adjusted the environment in the furnace to an ultra-high vacuum environment.

This experiment has very high requirements for the experimental environment. Among various vacuum environments, ultra-high vacuum is the most difficult to achieve.

Ning Chen needs to adjust the pressure in the furnace to below 10^(-9)Bar.

Under such pressure, the number of gas molecules per unit volume is only one trillionth of that under standard atmospheric pressure.

After adjusting the ultra-high vacuum environment, Ning Chen began to heat the furnace.

This step is to allow the various components in the furnace to quickly sublime into a steam state at high temperatures so that subsequent operations can be carried out.

Deng Hang watched Ning Chen's operations from the side and was very satisfied with Ning Chen's operation process.

Originally, Deng Hang planned to help Ning Chen complete the experiment, but seeing that Ning Chen could do it so well on his own, Deng Hang had no room for intervention.

If the tacit understanding between two people is not good enough, the efficiency of two people operating together may not be as high as that of one person operating alone, and it may even be harmful.

Deng Hang could only continue to watch Ning Chen operate from the sidelines. If he found any problems, he could just remind Ning Chen.

As the experiment progresses, Ning Chen has entered the critical operation stage.

Ning Chen sprayed the heated steam directly onto the single crystal substrate at the appropriate temperature after collimating it through small holes.

If this step can be completed, the crystals can be arranged layer by layer and "grow" on the single crystal substrate to form the ideal thin film.

This step of the experimental operation was very difficult. At the beginning, Ning Chen's several attempts ended in failure.

But after constant attempts, Ning Chen gradually found the feeling, and the film on the single crystal substrate was getting closer and closer to the ideal state.

After conducting more than twenty experiments, Ning Chen finally obtained the FeSe film he expected.

"Very good, the film produced this time is in ideal condition!"

Looking at the film sample under the instrument, Deng Hang couldn't help but praise Ning Chen.

Ning Chen was not satisfied with the first success and continued the work of generating thin film samples.

Ning Chen hopes to take advantage of this opportunity to prepare more FeSe thin film samples, which will also help future research work.

…

After a few days, Ning Chen has synthesized multiple ideal FeSe thin film samples and completed testing of various experimental data of these thin film samples.

Although Ning Chen has not yet had time to conduct a detailed analysis of these data, Ning Chen has basically determined that these FeSe films indeed play a crucial role in the potassium-iron-selenium superconducting system.

If the mechanism is carefully explored, Ning Chen is very confident that he will discover some more complex iron-based superconductor structures.

After completing these experiments, Ning Chen found Tao Wei and expressed his gratitude to Tao Wei.

"Ning Chen, you're welcome. It's my honor to be able to help you. If you need anything in the future, you can contact me at any time."

Tao Wei is already very old. Although Tao Wei is a world-class expert in the field of superconductivity, others will need to take over Tao Wei's mantle in the future.

Although Tao Wei and Ning Chen have only known each other for a few days, they already treat Ning Chen as his student.

The emergence of outstanding young scholars like Ning Chen in China made Tao Wei feel full of hope.

After thanking Tao Wei again, Ning Chen returned to his dormitory.

Ning Chen first ordered a flight back to Shengzhou online. Because Ning Chen hoped to start the follow-up experiment as soon as possible, he directly ordered a flight for the next morning.

After booking the flight tickets, Ning Chen realized something.

"When I came to Yanjing this time, I haven't even told Song Xiyun and Lin You yet. It wouldn't be good if they just left without saying anything."

Ning Chen felt that no matter whether he had time to meet them this time or not, he had to at least tell them.

Thinking of this, Ning Chen told Song Xiyun and Lin You on QQ that he was in Yanjing now but would leave tomorrow.

After a while, Ning Chen first received a reply from Song Xiyun.

"Leaving tomorrow? Why did you tell me tonight?"

"I came quite suddenly. I have been doing experiments at the Chinese Academy of Sciences. I don't know when I will be able to finish it, so I didn't tell you yet."

Soon, Song Xiyun replied to the message again.

"Then shall I go to your place, or you to come to my place?"

Seeing what Song Xiyun said, Ning Chen was embarrassed to let Song Xiyun come over.

"I'll go find you and leave now."

Ning Chen checked the route and then took the subway to Yanda.

More than half an hour later, Ning Chen came out of the subway station and was surprised to find Song Xiyun waiting for him at the exit of the subway station.

After the two people's eyes met, they both looked at each other and smiled.

"Song Xiyun, how did you know I would come out here?"

"It is very convenient to take the subway from the Chinese Academy of Sciences to Yanda, and this is the closest exit to Yanda. You will definitely come out from this exit."

Ning Chenxin said that girls who study mathematics are indeed not easy, and they do have a very strong logic in thinking about problems.

"Of course, even if you don't come out from here, I will just contact you again. But if you really come out from here... I can see you earlier."

Realizing that her words were a bit abrupt, Song Xiyun quickly continued:

"You will take a flight back to Shengzhou tomorrow morning. It won't be too late to go back."

"It's okay. Even if the subway stops for a while, I can still take a taxi back."

"Don't stand here, let's talk as we walk."

Song Xiyun and Ning Chen walked side by side towards Yanda. As they walked, Song Xiyun asked:

"Why did you come to Yanjing suddenly this time? If you had told me earlier, maybe I could go over and see you."

"Well... it's a long story. I suddenly had the opportunity to go to the Chinese Academy of Sciences to do an experiment, so I went there in a hurry. Even I was not prepared."

Because some things were classified as scientific research secrets, Ning Chen couldn't go into too much detail with Song Xiyun, so he could only talk about them roughly.

Song Xiyun understood Ning Chen's difficulties and did not continue to ask further questions on this matter.

At this time, Ning Chen took out his mobile phone, opened QQ and took a look, and found that Lin You had not replied to him yet.

"Song Xiyun, has Lin You been busy recently? I think he hasn't replied to me yet."

"Well, he's really busy recently, working on a new topic. In fact, I'm quite busy too, but I just happened to see the message you sent."

Knowing that Lin You was busy with a new project, Ning Chen couldn't bother calling him because he would be going back soon anyway.

The two people walked and talked on campus, telling each other about their recent experiences.

Ning Chen's experience here was relatively monotonous. It was nothing more than conducting various experiments in the laboratory, and because many things involved scientific research secrets, Ning Chen could only choose some things that could be talked about to share with Song Xiyun.

Song Xiyun is preparing for her master's degree defense and strives to complete the defense early this semester so that she can officially enter the doctoral stage.

In this way, time passed quickly and unconsciously.

Song Xiyun was very happy to suddenly see Ning Chen tonight, but when she thought that Ning Chen was about to leave, she never felt happy.