Stanford Advisors

Contact

Additional Info

  • Mail Code: 2115

All Publications

  • Demonstration of a diamond anvil cell platform at the Linac Coherent Light Source: capabilities and outlook. Journal of synchrotron radiation Frost, M., Boiadjieva, N., Han, M., Nguyen, Q. L., Wang, M., Bartels, H., Galtier, E., Lee, S. X., Karunadasa, H. I., Dyer, G., Glenzer, S. H., Mao, W. L., Lin, Y., Lee, H. J. 2026

    Abstract

    A novel X-ray free electron laser (XFEL) diffraction setup for use with diamond anvil cells (DACs) at the Linac Coherent Light Source (LCLS) is described. The new diamond window at the Matter at Extreme Conditions (MEC) instrument allows hard X-ray experiments on DACs to be performed in air. The platform is described along with alignment and calibration procedures, and details of the X-ray beam and diagnostics. Example data are presented, including a reversible XFEL-induced phase transition in CsPbI3. The DAC setup was commissioned at MEC, but is applicable to most LCLS instruments where the unique pulse structures available at LCLS offer access to new ultrafast experimental techniques at high pressure.

    View details for DOI 10.1107/S1600577526001608

    View details for PubMedID 41886270

  • Revisiting the Phase Diagram of Methane. Physical review letters Wang, M., Peña-Alvarez, M., Howie, R. T., Gregoryanz, E. 2026; 136 (4): 046101

    Abstract

    Combination of optical spectroscopy and in situ high-temperature-high-pressure techniques, were employed to investigate the melting curve and map out the location of methane's solid phases up to 45 GPa and 1100 K. The experiments yield two distinct diagrams, one that demonstrates the kinetic phase transformations and the other presenting the equilibrium states usually reached with time. Raman spectroscopy demonstrates that the appearance and transitions between the higher pressure phases (VII, VIII, and IX) are strongly dependent on the pressure-temperature-time path. Combined visual observations and Raman spectroscopy indicate that the melting curve of methane extends to significantly higher temperatures than previously reported, e.g., ∼1000  K at 15 GPa. The study also suggests that some inconsistencies in the earlier melting data could be attributed to photochemical dissociation and/or a reaction induced by high-intensity light sources.

    View details for DOI 10.1103/7hxd-hhjf

    View details for PubMedID 41698087

  • Revisiting the Phase Diagram of Methane PHYSICAL REVIEW LETTERS Wang, M., Pena-Alvarez, M., Howie, R. T., Gregoryanz, E. 2026; 136 (4)

    View details for DOI 10.1103/7hxd-hhjf

    View details for Web of Science ID 001681972100009