Communication: Tracking molecular structure deformation and relaxation in real time

Abstract

Communication: Non-monotonic evolution of dynamical heterogeneity in unfreezing process of metallic

Tracking molecular structure deformation of nitrobenzene and its torsion–vibration coupling by intense pumping CARS

“…The converging structures are also observed in other similar CARS experiment with intense pump pulse performed on CH 3 I and CH 3 NO 2 . [5,6] This indicates that NB molecule undergoes ultrafast structural deformation induced by nonresonant femtosecond laser during the duration of femtosecond laser pulse (∼100 fs) and then relaxes to equilibrium conformation. The nonresonant laser pulse of intensity 10 11 -10 12 W/cm 2 can create alignment and deformation of molecules, such as CO 2 and CS 2 .…”

“…Meanwhile, the frequency value of torsional mode in liquid NB can be obtained from the CARS spectra. The similar experiment are performed on the samples three different types of molecules which are molecule without internal rotation (CH 3 I), [5] molecule with free internal rotation (CH 3 NO 2 ), [6] and molecule with restricting internal rotation (C 6 H 5 NO 2 ), respectively. These investigations show that the modified CARS with intense pump pulse is a feasible and effective method to investigate structural deformation of molecules in the liquid phase induced by intense nonresonant femtosecond laser field without complex experimental system.…”

“…[4] Recently, the modified coherent anti-Stokes Raman spectroscopy (CARS) technique with an intense nonresonant femtosecond pump laser (10 11 -10 12 W/cm 2 ) is used to drive the structural deformation of liquid methyl iodide (CH 3 I) and nitromethane (CH 3 NO 2 ) molecules and track their relaxation process simultaneously. [5,6] The CARS is a nonlinear fourwave mixing process, and a Raman active vibrational mode is coherently driven when the energy difference between a pump laser and a Stokes laser is resonant with it. [7] CARS spectroscopy has been applied to investigate the ultrafast dynamics of molecules in the condensed phase.…”

Heat‐Resistant Intermetallic Compounds and Ceramic Dispersion Alloys for Additive Manufacturing: A Review

“…[ 113,114 ] Pre‐alloyed powder containing Ti and B has also been successfully used to form TiB 2 reinforcement in an Al matrix. [ 110,115 ] These studies focused on LPBF fabrication; however, the trends are likely to be transferable to LDED [ 116–119 ] and EPBF [ 120–122 ] fabrication due to the mechanisms behind the elevated‐temperature mechanical properties increase, as described in detail later in Section 3.3. Although their high‐temperature mechanical properties have not yet been evaluated, other CDAs have also been successfully additively manufactured.…”

Structural deformation of nitro group of nitromethane molecule in liquid phase in an intense femtosecond laser field

“…The CARS technique is modified by using an intense nonresonant femtosecond pump laser (10 11 -10 12 W/cm 2 ), which has been used to drive the liquid methyl iodide (CH 3 I) and NM molecules and simultaneously track their relaxation process. [5,6] In previous research, the structural deformation of CH 3 group has been detected. [6] However, the structural deformation of the NO 2 group of NM has not been detected.…”