Response of fs-Laser-Irradiated Diamond by Ultrafast Electron Diffraction

IF 3.3 3区化学 Q2 CHEMISTRY, PHYSICAL

The Journal of Physical Chemistry C Pub Date : 2024-10-22 DOI:10.1021/acs.jpcc.4c05999

Franky Bernal, Erika J. Riffe, Shane W. Devlin, Sebastien Hamel, Rebecca K. Lindsey, Alexander H. Reid, Mianzhen Mo, Duan Luo, Patrick Kramer, Xiaozhe Shen, Athavan Nadarajah, Alastair Stacey, Steven Prawer, Heather D. Whitley, Craig P. Schwartz, Richard J. Saykally

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Abstract

Structural details of the proposed solid–liquid phase transition of carbon have remained elusive, despite years of study. While it is theorized that novel carbon materials form from a liquid precursor, experimental studies have lacked the temporal and spatial resolution necessary to fully characterize the purported liquid state. Here we utilize megaelectronvolt-ultrafast electron diffraction (MeV-UED) to study laser irradiated submicron diamond thin films in a pump–probe scheme with picosecond time resolution to visualize potential structural changes of excited diamond. We probe the structure of diamond using a combination of fluences (13, 40 J/cm²) and time delays (10, 25, 100 ps), but observe negligible changes in the static diffraction pattern of diamond and an overall decrease in diffraction intensity up to 100 ps after the excitation pulse. We thus conclude that no appreciable amount of liquid or graphitized carbon is present and highlight the structural resilience of bulk diamond to intense 800 nm ultrafast laser pulses.

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超快电子衍射对 fs 激光照射金刚石的响应

尽管经过多年的研究，有关碳的固液相变的结构细节仍然难以捉摸。虽然理论上新型碳材料是由液态前体形成的，但实验研究却缺乏必要的时间和空间分辨率来全面描述所谓的液态。在这里，我们利用兆电子伏特-超快电子衍射（MeV-UED），以皮秒级的时间分辨率，通过泵浦探针方案研究激光辐照亚微米级金刚石薄膜，以观察激发金刚石的潜在结构变化。我们结合使用了通量（13、40 J/cm2）和时间延迟（10、25、100 ps）来探测金刚石的结构，但观察到金刚石静态衍射图样的变化可以忽略不计，并且在激发脉冲后 100 ps 内衍射强度总体下降。因此，我们得出结论：没有明显的液态碳或石墨化碳存在，并强调了大块金刚石在 800 纳米超快激光脉冲下的结构恢复能力。

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来源期刊

The Journal of Physical Chemistry C 化学-材料科学：综合

CiteScore

6.50

自引率

8.10%

发文量

2047

审稿时长

1.8 months

期刊介绍： The Journal of Physical Chemistry A/B/C is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.