Spatially resolved multimodal vibrational spectroscopy under high pressures

Area of Science:

• Spectroscopy
• Materials Science
• Chemical Imaging

Background:

• Current spectroscopic methods have limitations in simultaneous data acquisition and spatial resolution.
• Optical Photothermal Infrared (O-PTIR) spectroscopy offers unique capabilities for chemical and physical analysis.
• Assessing material crystallinity, especially in soft materials, requires advanced characterization techniques.

Purpose of the Study:

• To introduce and discuss the potential of a novel multimodal spectroscopic technique combining O-PTIR with Raman spectroscopy.
• To evaluate the technique's utility for in situ studies under controlled environments.
• To demonstrate its application in determining material crystallinity and its use with diamond anvil cells.

Main Methods:

• Simultaneous collection of infrared and Raman scattering spectra.
• Hyperspectral imaging and chemical imaging with sub-500 nm spatial resolution.
• Application of the technique to soft and inorganic materials, including use with a diamond anvil cell.

Main Results:

• The multimodal O-PTIR technique enables simultaneous infrared and Raman spectral acquisition.
• It achieves wavelength-independent sub-500 nm spatial resolution for chemical and hyperspectral imaging.
• Differences in soft material crystallinity linked to processing were resolved, and its utility in diamond anvil cell studies was demonstrated.

Conclusions:

• The novel multimodal O-PTIR technique significantly advances in situ spectroscopic studies.
• It provides high-resolution chemical and hyperspectral imaging capabilities.
• This technique shows great promise for material characterization, including crystallinity assessment and high-pressure studies.