GRAPHERGIA Scientific Publication: Temperature Dependence of Coherent versus Spontaneous Raman Scattering

GRAPHERGIA’s investment in disseminating its research results continues growing with a new scientific article supported by the project partner, the  University "Sapienza" Rome (URM). This scientific article, "Temperature Dependence of Coherent versus Spontaneous Raman Scattering”, was published in open access in November 2024 in the scientific journal  “Physical Review Letters” (Phys. Rev. Lett. 133, 206902 – Published 15 November, 2024).

GRAPHERGIA’s Scientific Paper Abstract

Because of their sub picosecond temporal resolution, coherent Raman spectroscopies have been proposed as a viable extension of spontaneous Raman thermometry, to determine dynamics of mode specific vibrational energy content during out of equilibrium molecular processes. Here we show that the presence of multiple laser fields stimulating the vibrational coherences introduces additional quantum pathways, resulting in destructive interference. This ultimately reduces the thermal sensitivity of single spectral lines, nullifying it for harmonic vibrations and temperature independent polarizability. We demonstrate how harnessin anharmonic signatures such as vibrational hot bands enables coherent Raman thermometry.