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Maximum relative excitation of a specific vibrational mode via optimum laser-pulse duration

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Title: Maximum relative excitation of a specific vibrational mode via optimum laser-pulse duration
Author: Zhou, Xiang; Lin, Zhibin; Jiang, Chenwei; Gao, Meng; Allen, Roland E.
Abstract: For molecules and materials responding to femtosecond-scale optical laser pulses, we predict maximum relative excitation of a Raman-active vibrational mode with period T when the pulse has a full-width-at-halfmaximum duration tau approximate to 0.42T. This result follows from a general analytical model, and is precisely confirmed by detailed density-functional-based dynamical simulations for C(60) and a carbon nanotube, which include anharmonicity, nonlinearity, no assumptions about the polarizability tensor, and no averaging over rapid oscillations within the pulse. The mode specificity is, of course, best at low temperature and for pulses that are electronically off-resonance, and the energy deposited in any mode is proportional to the fourth power of the electric field.
Description: Journals published by the American Physical Society can be found at http://journals.aps.org/
Publisher: American Physical Society
Subject: STIMULATED RAMAN-SCATTERING
FEMTOSECOND LASER
MOTION
DYNAMICS
C-60
SPECTROSCOPY
GENERATION
CARBON
Physics
Department: Physics and Astronomy
URI: http://dx.doi.org/10.1103/PhysRevB.82.075433
Date: 2010

Citation

Xiang Zhou, Zhibin Lin, Chenwei Jiang, Meng Gao and Roland E. Allen. Phys.Rev.B 82 075433 2010."Copyright (2010) by the American Physical Society."

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