Sergei A. Aseyev , Boris N. Mironov , Anatoly A. Ischenko , Evgeny A. Ryabov
{"title":"真空中金晶体激光诱导的结构动力学","authors":"Sergei A. Aseyev , Boris N. Mironov , Anatoly A. Ischenko , Evgeny A. Ryabov","doi":"10.1016/j.vacuum.2025.114515","DOIUrl":null,"url":null,"abstract":"<div><div>Ultrafast electron diffraction (UED) is used to study laser-induced processes in a free-standing ≈ 50 nm-thick film of gold single crystal. The sample is pumped by 515-nm fs laser pulses with incident fluence of ≈9 mJ/cm<sup>2</sup> and probed by time-delayed fs electron pulses with an energy of 47 keV. The Debye-Waller formalism is used to directly map the time dependence of the crystal lattice temperature. Based on the experimental data, the electron-phonon coupling constant for Au is estimated, which is in agreement with the literature data. By analyzing the electron-diffraction kinetics, it was possible to visualize coherent shear acoustic oscillations in gold. A new methodology is presented, which allows estimating the melting conditions of crystals induced by short laser pulses. It is based on the observation of reversible structural dynamics in a non-destructive manner using a low-intensity pulsed electron probe.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"240 ","pages":"Article 114515"},"PeriodicalIF":3.8000,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Laser-induced structural dynamics of a gold crystal in vacuum\",\"authors\":\"Sergei A. Aseyev , Boris N. Mironov , Anatoly A. Ischenko , Evgeny A. Ryabov\",\"doi\":\"10.1016/j.vacuum.2025.114515\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Ultrafast electron diffraction (UED) is used to study laser-induced processes in a free-standing ≈ 50 nm-thick film of gold single crystal. The sample is pumped by 515-nm fs laser pulses with incident fluence of ≈9 mJ/cm<sup>2</sup> and probed by time-delayed fs electron pulses with an energy of 47 keV. The Debye-Waller formalism is used to directly map the time dependence of the crystal lattice temperature. Based on the experimental data, the electron-phonon coupling constant for Au is estimated, which is in agreement with the literature data. By analyzing the electron-diffraction kinetics, it was possible to visualize coherent shear acoustic oscillations in gold. A new methodology is presented, which allows estimating the melting conditions of crystals induced by short laser pulses. It is based on the observation of reversible structural dynamics in a non-destructive manner using a low-intensity pulsed electron probe.</div></div>\",\"PeriodicalId\":23559,\"journal\":{\"name\":\"Vacuum\",\"volume\":\"240 \",\"pages\":\"Article 114515\"},\"PeriodicalIF\":3.8000,\"publicationDate\":\"2025-06-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Vacuum\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0042207X25005056\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Vacuum","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0042207X25005056","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Laser-induced structural dynamics of a gold crystal in vacuum
Ultrafast electron diffraction (UED) is used to study laser-induced processes in a free-standing ≈ 50 nm-thick film of gold single crystal. The sample is pumped by 515-nm fs laser pulses with incident fluence of ≈9 mJ/cm2 and probed by time-delayed fs electron pulses with an energy of 47 keV. The Debye-Waller formalism is used to directly map the time dependence of the crystal lattice temperature. Based on the experimental data, the electron-phonon coupling constant for Au is estimated, which is in agreement with the literature data. By analyzing the electron-diffraction kinetics, it was possible to visualize coherent shear acoustic oscillations in gold. A new methodology is presented, which allows estimating the melting conditions of crystals induced by short laser pulses. It is based on the observation of reversible structural dynamics in a non-destructive manner using a low-intensity pulsed electron probe.
期刊介绍:
Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences.
A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below.
The scope of the journal includes:
1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes).
2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis.
3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification.
4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.