chanelink logo
CHANELINK
English

Using attosecond pulses to reveal new information about the photoelectric effect

453
2024-09-02 15:22:21
See translation

Scientists from the Stanford National Accelerator (SLAC) laboratory of the US Department of Energy have revealed new information about the photoelectric effect using attosecond pulses: the delay time of photoelectric emission is as long as 700 attosecond, far exceeding previous expectations. The latest research challenges existing theoretical models and helps to reveal the interactions between electrons more deeply, promoting the development of technologies such as semiconductors and solar cells. The relevant paper titled 'Attested delays in X-ray molecular ionization' was published in the latest issue of the journal Nature.

The photoelectric effect refers to the phenomenon in which photons interact with molecules or atoms on a metal surface when light is irradiated, causing the metal surface to release electrons. This effect laid the theoretical foundation for quantum mechanics, but the so-called photoelectric emission delay time has always been a fiercely debated topic. The latest progress in the field of attosecond science provides an important tool for further revealing the secret of this time delay.

Research schematic diagram
In the latest study, researchers used attosecond (10 billionth of a second) X-ray pulses emitted by SLAC's linear accelerator coherent light source to ionize core level electrons and "kick" them out of molecules. Then, they used separate laser pulses to "kick" the electrons in slightly different directions based on their emission time to measure the delay time of photoelectric emission.

Research shows that this delay time is as long as 700 attosecond, and the interaction between electrons plays an important role in this delay. Researchers point out that measuring and interpreting these time delays can help better analyze experimental results, especially in fields such as protein crystallography and medical imaging where the interaction between X-rays and matter is crucial. They plan to delve deeper into the electronic dynamics within different molecular systems, further revealing new information on electronic behavior and molecular structure.

Source: Science and Technology Daily, Author: Liu Xia

Related Recommendations

  • Telescope Discovers Record breaking Galaxy Space Laser

    A powerful telescope in South Africa has detected a space laser 5 billion light-years away from Earth, known as the "megamaser". Scientists named it Nkalakatha, which means "big boss" in Zulu language.Nkalakatha is the farthest hydroxyl giant detected so far, discovered by the MeerKAT telescope on the first night of the survey, which is expected to include 3000 hours of observation. The team of sc...

    2024-03-09
    See translation

  • Progress has been made in the development of anti resonant hollow core fiber Raman probes with low background noise at Shanghai Optics and Machinery Institute

    Recently, the research team of the Special Glass and Fiber Research Center of the Advanced Laser and Optoelectronic Functional Materials Department of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, aimed at the demand for in-situ detection of Raman signals, expanded the functions of the laboratory commercial Renishaw Invia confocal micro Raman spectrometer by usi...

    2024-05-22
    See translation

  • New machine learning algorithm accurately decodes molecular optical 'fingerprints'

    Recently, a research team from Rice University in the United States developed a new machine learning algorithm - Peak Sensitive Elastic Network Logistic Regression (PSE-LR). This algorithm is adept at interpreting the unique optical characteristics of molecules, materials, and disease biomarkers, which can help achieve faster and more accurate medical diagnosis and sample analysis. The relevant pa...

    05-09
    See translation

  • A German 3D printing company applies for bankruptcy

    On February 5th, it was reported that Q BIG 3D GmbH filed for bankruptcy on January 31, 2025. The Ludwigsburg District Court has ordered temporary bankruptcy administration and appointed Mr. Ilkin Bananyarli of PLUTA Rechtsanwarts GmbH as the temporary bankruptcy administrator.The company was founded in 2019 and focuses on large format particle 3D printing systems, providing additive manufacturing...

    02-06
    See translation

  • First 6-inch thin film lithium niobate photonic chip wafer pilot production line

    Recently, Shanghai Jiao Tong University Wuxi Photon Chip Research Institute (CHIPX) located in Binhu District, Wuxi City, has achieved a breakthrough - the first 6-inch thin film lithium niobate photon chip wafer has been produced on China's first photon chip pilot line, and high-performance thin film lithium niobate modulator chips with ultra-low loss and ultra-high bandwidth have been mass-produ...

    06-11
    See translation