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The effect of pulse temporal profiles on the Autler-Townes (AT) splitting in photoelectron spectra is theoretically studied by employing the time-dependent wave packet method for a rotational Na2 molecule. The AT splitting which results from the sufficient Rabi oscillations is affected by the pulse profile and molecular alignment. The AT splitting may be observed only by utilizing proper pulse profiles with a certain intensity. 相似文献
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Autler-Townes Splitting in Photoelectron Spectrum of Three-Level Li2 Molecule in Ultrashort Pulse Laser Fields 下载免费PDF全文
The Autler-Townes (AT) splitting in femtosecond photoelectron spectrum of three-level Li2 molecules is theoretically investigated using time-dependent quantum wave packet method. With proper femtosecond laser pulses, three peaks of the AT splitting can be observed in the photoelectron spectrum. The AT splitting stems from rapid Rabi oscillation caused by intense ultrashort laser pluses. The effects of laser parameters on the molecular ionization dynamics are also discussed. 相似文献
3.
The laser-induced vibrational state-selectivity of product HF in
photoassociation reaction H+F$\rightarrow$HF is theoretically
investigated by using the time-dependent quantum wave packet method.
The population transfer process from the continuum state down to the
bound vibrational states can be controlled by the driving laser. The
effects of laser pulse parameters and the initial momentum of the two
collision atoms on the vibrational population of the product HF are
discussed in detail. Photodissociation accompanied with the
photoassociation process is also described. 相似文献
4.
Ultrafast photoionization of ions and molecules by orthogonally polarized intense laser pulses: Effects of the time delay 下载免费PDF全文
We present the photoelectron momentum distributions(PMDs) and the photoelectron angular distributions(PADs) of He+ ions, aligned H2+ molecules and N2 molecules by intense orthogonally polarized laser pulses. Simulations are performed by numerically solving the corresponding two-dimensional time-dependent Schr?dinger equations(TDSEs) within the single-electron approximation frame. Photoelectron momentum distributions and photoelectron angular distributions present different patterns with the time delays Td, illustrating the dependences of the PMDs and PADs on the time delays by orthogonally polarized laser pulses. The evolution of the electron wavepackets can be employed to describe the intensity of the PADs from the TDSE simulations for N2 molecules. 相似文献
5.
利用2D平面模型,求解了描述定向H_2+分子和阿秒XUV脉冲相互作用的薛定谔方程,并求得光电子的角度分布.在计算模型中,采用基态1sσg和第一激发态2pσu的等比例混合态作为初始态,而激光脉冲的光子能量大于电离势,强度为1014 W/cm2. 计算结果表明,光电子角分布的非对称性和脉冲的宽度密切相关.这种非对称性实际上是由于初始态的基态和激发态的相干振荡而导致的.当使用长脉冲时,这种相干振荡的周期效应就会被平均而消失,从而产生的光电子能谱会呈对称角分布. 相似文献
6.
The above-threshold dissociation (ATD) of the HD+ molecular ion in femtosecond laser field is investigated theoretically. The energy-dependent distribution of the dissociated fragments is calculated using an asymptoticflow expression in the momentum space. The calculations show that the ATD of HD+ is sensitive to the initial vibrational level of ground electronic state. Multiphoton ATDs can be observed in the dissociation processes. The dynamics phenomena are interpreted by using the concept of light-dressed potential. 相似文献
7.
Controlling Population Transfer and Dissociation Rate of Na2 Molecules with Ultra-Short Intense Laser Pulses 下载免费PDF全文
A scheme used for controlling the population transfer and the dissociation rate of Na2 molecules is described by using the quantum wavepacket dynamical method. It is theoretically shown that the population transfer and the dissociation rate of Na2 molecules can be controlled by pump and probe laser pulses with appropriate widths of pulses, sequence and intensities. 相似文献
8.
Photoionization of NaK molecule with a double-well potential in femtosecond pump--probe pulse laser fields 下载免费PDF全文
The method of time-dependent quantum wave packet dynamics is used to calculate the
femtosecond pump--probe photoelectron spectra and study the wave packet dynamic
processes of the double-minimum potential state 61∑+ of NaK in intense
laser fields. The evolutions of the wave packet and the photoelectron energy spectra
with time and internuclear distance are described in detail. The wave packet dynamic
information of the 61∑+ state can be extracted from the photoelectron
energy spectra. 相似文献
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