The femtosecond time-resolved impulsive stimulated Raman scattering (fs-ISRS) has been performed to study the low frequency lattice mode dynamics of the RDX crystal. Through Fourier filtering, four lattice mode dynamics is distinguished from the time-resolved spectrum. And the wavenumbers and time constants of these four lattice modes are determined by fitting their dynamic curves. The energy dispersion paths of these four lattice modes are deduced from these fitting parameters. Compared with the other three lattice modes, the lattice mode with wavenumber 30 cm⁻¹ has a very longer life time. We consider that the excitation of this lattice mode more likely to cause the damage of the intermolecular interaction under the strong external stimulation.

已执行飞秒时间分辨脉冲受激拉曼散射 (fs-ISRS) 来研究 RDX 晶体的低频晶格模式动力学。通过傅立叶滤波，从时间分辨光谱中区分出四种晶格模式动力学。这四种晶格模式的波数和时间常数是通过拟合它们的动态曲线来确定的。这四种晶格模式的能量色散路径是从这些拟合参数中推导出来的。与其他三种晶格模式相比，波数为30 cm ^-1的晶格模式具有非常长的寿命。我们认为这种晶格模式的激发更容易在强烈的外部刺激下引起分子间相互作用的破坏。