Vibrational dynamics of nitromethane mixed with IR780 dye studied by coherent anti-stokes Raman spectroscopy

Abstract

Vibrational coupling between different kinds of molecules in liquid mixture is studied by multiplex coherent anti‐Stokes Raman spectroscopy (CARS). To identify vibrational coherence, fs‐probe with high time resolution and narrowband‐probe with high spectral resolution are adopted in CARS experiments. Using liquid nitromethane (NM) mixed with organic dye IR780 perchlorate as the sample, we can clearly observe the interference between different vibrational modes. The intermolecular vibrational interaction between NM and IR780 molecules results in the vibrational coherence transfer (VCT) in the form of a change of phase correlation. Compared with symmetric bending vibration of NO2, coherence transfer is found to be easier to take place between C―N bond of NM and vibrations of IR780, which indicates the selectivity of intermolecular vibrational interaction. The selectivity is deduced to be related to the coordination between intramolecular and collective motion of molecules. Copyright © 2016 John Wiley & Sons, Ltd.

Phase transition and trigger mechanism of initial reaction under pressure for benzofuroxan energetic materials: Raman spectroscopy and first‐principle calculations

“…The main strength of the Raman spectroscopy is able to provide a great wealth of molecular vibration information. [ 40,41 ] The experimental Raman spectra of benzofuroxan at the selected pressure in the spectral range of 400–1,700 cm −1 have been shown in Figure 2. It can be seen that there are about 15 Raman bands ( v 1 –v 15 ) that can be observed at ambient pressure.…”

Atomically Thin TaSe2 Film as a High‐Performance Substrate for Surface‐Enhanced Raman Scattering

“…The vibrational modes and the corresponding Raman shifts of the MG molecules and the IR780 molecules are also listed in Table S1 in the Supporting Information. [46][47][48][49][50] The SERS signals for the R6G, MG, and IR780 molecules excited at other wavelengths are very weak or cannot be detected at all. This result strongly suggests that the molecular resonance combined with the photons may play the most important role in the SERS mechanism of the TaSe 2 film and the photon-induced charge transfer (PICT) is verified in the following discussion.…”

Visualizing Intramolecular Vibrational Redistribution in Cyclotrimethylene Trinitramine (RDX) Crystals by Multiplex Coherent Anti-Stokes Raman Scattering

“…In our previous work, we observed similar cases in IR780/NM solution and demonstrated that the bad spectral resolution did not influence the analysis of vibrational coupling. 23 For Raman mode assignment, the Raman spectrum of α-RDX was calculated by ab initio calculations using the B3LYP density functional theory method with the Sadlej's mediumsized polarized basis set (SadlejpVTZ). Calculations were performed with the Gaussian 03 computation package.…”