Molecular Dynamics Simulation of Vibrational Phase Relaxation along the Critical Isochore of Nitrogen : The Role of Local Density Fluctuations
| dc.creator | Roychowdhury, Swapan | |
| dc.creator | Bagchi, Biman | |
| dc.date | 2002-10-08 | |
| dc.date | 2003-01-24 | |
| dc.date.accessioned | 2026-07-07T05:48:13Z | |
| dc.date.available | 2026-07-07T05:48:13Z | |
| dc.description | Vibrational dephasing of nitrogen molecule is known to show highly interesting anomalies near its gas-liquid critical point. Here we present theoretical and computational studies of the Raman linewidth of nitrogen along the critical isochore. The linewidth is found to have a lambda shaped temperature dependence near the critical point. As observed in experimental studies, the calculated lineshape becomes Gaussian as the critical temperature ($T_{c}$) is approached. Both the present simulation and a mode coupling theory (MCT) analysis show that the slow decay of the enhanced density fluctuations near the critical point (CP), probed at the sub-picosecond time scales by vibrational frequency modulation, along with an enhanced vibration-rotation coupling, are the main causes of the observed anomalies. | |
| dc.description | 4 pages, 3 figures, revtex, accepted in Physical Review Letters | |
| dc.identifier | https://arxiv.org/abs/physics/0210039 | |
| dc.identifier | http://arxiv.org/abs/physics/0210039 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/84947 | |
| dc.subject | Chemical Physics | |
| dc.title | Molecular Dynamics Simulation of Vibrational Phase Relaxation along the Critical Isochore of Nitrogen : The Role of Local Density Fluctuations | |
| dc.type | text |