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本文通过数值求解一维含时薛定谔方程,理论研究了超短啁啾脉冲(5-fs,790-nm)对处于低振动态氢分子离子解离动力学的影响. 研究过程中有效利用流算符的方法得到不同激光强度下的解离几率及核波包密度分布. 结果表明:低强度的啁啾脉冲可显著增强低振动态氢分子离子的解离过程,使解离过程提前发生并在较短的时间内获得较多的解离产物, 并给出相应的理论解释. 相似文献
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徐文霞苗向阳 《原子与分子物理学报》2013,(5):774-778
本文通过数值求解一维含时薛定谔方程,理论研究了超短啁啾脉冲(5fs,790nm)对处于低振动态氢分子离子解离动力学的影响.研究过程中有效利用流算符的方法得到不同激光强度下的解离几率及核波包密度分布.结果表明:低强度的啁啾脉冲可显著增强低振动态氢分子离子的解离过程,使解离过程提前发生并在较短的时间内获得较多的解离产物,并给出相应的理论解释. 相似文献
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采用含时量子波包方法研究基电子态HeH+体系优化的光缔合几率,即He+H+→HeH+随碰撞粒子对初始动量的变化,并研究伴随该过程的多光子跃迁和解离.选取v=6振动能级为目标态,通过优化激光场参数得到碰撞粒子对的最优光缔合几率.结果表明:随着碰撞粒子对初始动量的增加,光缔合所用的最优激光场的持续时间逐渐减少,但光场的强度和失谐逐渐增加.在某些初始碰撞动量附近,由于共振多光子跃迁过程的存在,最优的光场不能严格地将碰撞粒子对缔合到目标态.此外,研究表明随着初始动量的增加,系统的超阈值解离几率近似线性地增加到一个最大值,直至饱和强度.并且,在碰撞粒子对的初始动量较大时,超阈值解离主导解离过程. 相似文献
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运用含时波包法(time-dependent wave packet method),对CH4和CD4在光滑静止的Ni(100)表面的解离吸附进行了量子动力学研究与计算.不同振动态下解离几率随平动能的变化曲线表明,反应分子的振动能对分子的解离有重要贡献,其反应趋势,与其它理论模型得到的结果一致.CH4与CD4解离几率的对数随平动能的变化曲线表明,CH4的解离几率比CD4的要高得多,这种同位素效应,是由它们不同的零点能和量子隧道效应引起的,且与实验结果符合得比较好. 相似文献
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运用含时波包法 (time -dependentwavepacketmethod) ,对CH4和CD4在光滑静止的Ni( 10 0 )表面的解离吸附进行了量子动力学研究与计算。不同振动态下解离几率随平动能的变化曲线表明 ,反应分子的振动能对分子的解离有重要贡献 ,其反应趋势 ,与其它理论模型得到的结果一致。CH4与CD4解离几率的对数随平动能的变化曲线表明 ,CH4的解离几率比CD4的要高得多 ,这种同位素效应 ,是由它们不同的零点能和量子隧道效应引起的 ,且与实验结果符合得比较好 相似文献
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Cai-Ping Zhang 《光谱学快报》2014,47(4):267-280
The influence of a chirped laser pulse (5- fs, 800- nm) on dissociation and ionization processes for hydrogen molecular ions at low vibrational levels with different intensities has been discussed by numerically solving the one-dimensional time-dependent Schrödinger equation. By employing the “virtual detector” method, the probabilities and kinetic- energy- release spectra of dissociation and Coulomb explosion channels have been calculated. The results indicate that both the dissociation and ionization processes could be enhanced with proper chirp parameters; additionally, the dissociation process occurring at an early time in the chirped laser field is more sensitive to chirp parameters at low intensity due to the enhancement of the bond softening channel. The corresponding theoretical explanation is also provided. 相似文献
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《中国光学快报(英文版)》2015,(3)
Filamentation-induced water condensation and snow formation are investigated using laser pulses with different chirps and pulse widths. Chirped pulses result in the laser filamentation with different spatial lengths and intensities, which has a great impact on airflow motion and snow formation. The experiments show that snow formation mainly relates to the filament intensity distribution. Negative chirped pulses produce a greater amount of snow because of higher intensity inside the filaments as compared with the positive chirped pulses. 相似文献
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We present a theoretical study of dynamics of Rydberg states of lithium using ultra short chirped laser pulse having a Gaussian
envelope. The population transfer probabilities are calculated of different Rydberg states on chirped laser factors. The calculations
are performed by direct numerical integration of Schr?dinger equation using fourth order Runge-Kutta method. The behavior
of dynamics of Rydberg states for these factors is of great significance. These results are of potential interest in coherent
quantum control, quantum computation and in many physical and chemical processes. 相似文献
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用经典动力学和量子力学方法分别研究了H2+在超短强激光场中的电离、离解和残存行为,得到了相似的结果:即在超短强激光脉冲作用下,H2+的电离占优,但有限的量子计算低估了H2+的离解几率;而经典处理则没有显示H2+在超强场中的稳定化。另外,经典计算表明当核间距R伸展到一定范围时,H2+的电离率最大。这符合量子计算中发现的电荷谐振增强电离(CREI)现象。 相似文献
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M. V. Ivanov S. V. Alekseev N. G. Ivanov V. F. Losev N. A. Ratakhin A. G. Yastremskii 《Bulletin of the Russian Academy of Sciences: Physics》2017,81(9):1094-1098
The results from the generation and amplification of positively chirped pulses of 0.05 ns duration at a central wavelength of 475 nm in a THL-100 laser system are presented. It is found that the initial complex allows the generation of such radiation pulses with Gaussian intensity profiles and energies of up to 7 mJ. When such pulses with energies of 2–4 mJ are amplified in an XeF(C-A) amplifier, it is possible to achieve a saturation mode and obtain at the output laser beams with energies of up to 3.2 J. The possibility of compressing subnanosecond pulses at a wavelength of 475 nm in a compressor based on diffraction gratings is demonstrated. 相似文献
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利用高重复频率(1kHz)、吉瓦级飞秒激光脉冲实验验证了高强度飞秒脉冲在空气中的自 压缩现象,研究了入射脉冲在不同初始啁啾情况下经空气中聚焦成丝后,时域及频域特性随 入射脉冲能量的变化规律.实验结果表明,在无需后继色散补偿情况下,高强度飞秒脉冲仅 通过在空气中的非线性传输过程就可以实现脉冲压缩;在入射脉冲为负啁啾情况下,实验观 察到脉冲光谱及时域宽度同时得到压缩,并可获得比激光源所能提供的更短的近双曲正割型 变换限脉冲.
关键词:
高强度飞秒激光脉冲
自压缩
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