Time-dependent theoretical approach to the influence of laser fields on the resonance enhanced multi-photon ionization of SH radical

岳大光,; 郑晓云,; 刘浩,; 王春兴,; 孟庆田,

doi:10.1088/1674-1056/18/4/032

Cited by 5 publications

(1 citation statement)

References 17 publications

(8 reference statements)

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“…Indeed, Zewail and his coworkers obtained such relevant information for NaI by analyzing the features of FTS, and concluded that the potential well has a Morse-type shape. [3] In the interpretation of femtosecond pump-probe experiments, the theoretical treatment based on the time-dependent wave packet method has played an important role, especially in the studies of molecular photo-fragmentation, [5,6] multiphoton ionization, [7,8] and dissociation [9][10][11][12][13] of molecules under external fields. Using the results of wave packet calculations of dissociation dynamics with ab initio electronic energies and coupling elements, Regan et al [14] investigated the ultraviolet photo-dissociation of HCl in selected rovibrational states.…”

Section: Introductionmentioning

confidence: 99%

Manifestation of external field effect in time-resolved photo-dissociation dynamics of LiF

Meng¹,

Varandas²

2013

Chinese Phys. B

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The photo-dissociation dynamics of LiF is investigated with newly constructed accurate ab initio potential energy curves (PECs) using the time-dependent quantum wave packet method. The oscillations and decay of the wave packet on the adiabats as a function of time are given, which can be compared with the femtosecond transition-state (FTS) spectroscopy. The photo-absorption spectra and the kinetic-energy distribution of the dissociation fragments, which can exhibit the vibration-level structure and the dispersion of the wave packet, respectively, are also obtained. The investigation shows a blue shift of the band center for the photo-absorption spectrum and multiple peaks in the kinetic-energy spectrum with increasing laser intensity, which can be attributed to external field effects. By analyzing the oscillations of the wave packet evolving on the upper adiabat, an approximate inversion scheme is devised to roughly deduce its shape.

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Section: Introductionmentioning

confidence: 99%

Manifestation of external field effect in time-resolved photo-dissociation dynamics of LiF

Meng¹,

Varandas²

2013

Chinese Phys. B

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Active manipulation of the selective alignment by two laser pulses

2010

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This paper solves numerically the full time-dependent Schrödinger equation based on the rigid rotor model, and proposes a novel strategy to determine the optimal time delay of the two laser pulses to manipulate the molecular selective alignment. The results illustrate that the molecular alignment generated by the first pulse can be suppressed or enhanced selectively, the relative populations of even and odd rotational states in the final rotational wave packet can be manipulated selectively by precisely inserting the peak of the second laser pulse at the time when the slope for the alignment parameter by the first laser locates a local maximum for the even rotational states and a local minimum for the odds, and vice versa. The selective alignment can be further optimised by selecting the intensity ratio of the two laser pulses on the condition that the total laser intensity and pulse duration are kept constant.

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Isotope effect on the stereodynamics for the collision reaction H+LiF(ν = 0, j = 0) → HF+Li

Yue¹

2012

Chinese Phys. B

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Stereodynamics for the reaction H+LiF(v = 0, j = 0) → HF+Li and its isotopic variants on the ground-state (1 2 A ′ ) potential energy surface (PES) are studied by employing the quasi-classical trajectory (QCT) method. At a collision energy of 1.0 eV, product rotational angular momentum distributions P (θr), P (ϕr), and P (θr, ϕr), are calculated in the center-of-mass (CM) frame. The results demonstrate that the product rotational angular momentum j ′ is not only aligned along the direction perpendicular to the reagent relative velocity vector k, but also oriented along the negative y axis. The four generalized polarization-dependent differential cross sections (PDDCSs) are also computed. The PDDCS 00 distribution shows a preferential forward scattering for the product angular distribution in each of the three isotopic reactions, which indicates that the title collision reaction is a direct reaction mechanism. The isotope effect on the stereodynamics is revealed and discussed in detail.

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Time-dependent theoretical approach to the influence of laser fields on the resonance enhanced multi-photon ionization of SH radical

Cited by 5 publications

References 17 publications

Manifestation of external field effect in time-resolved photo-dissociation dynamics of LiF

Manifestation of external field effect in time-resolved photo-dissociation dynamics of LiF

Active manipulation of the selective alignment by two laser pulses

Isotope effect on the stereodynamics for the collision reaction H+LiF(ν = 0, j = 0) → HF+Li

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